Amazon Linux 2023 Security Advisory: ALAS2023-2026-1968
Advisory Released Date: 2026-07-20
Advisory Updated Date: 2026-07-20
FAQs regarding Amazon Linux ALAS/CVE Severity
In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: clear page->private in free_pages_prepare() (CVE-2026-43303)
In the Linux kernel, the following vulnerability has been resolved:
ipvs: skip ipv6 extension headers for csum checks (CVE-2026-45850)
In the Linux kernel, the following vulnerability has been resolved:
selinux: fix overlayfs mmap() and mprotect() access checks (CVE-2026-46054)
In the Linux kernel, the following vulnerability has been resolved:
eventpoll: fix ep_remove struct eventpoll / struct file UAF (CVE-2026-46242)
In the Linux kernel, the following vulnerability has been resolved:
tap: free page on error paths in tap_get_user_xdp() (CVE-2026-46320)
In the Linux kernel, the following vulnerability has been resolved:
tun: free page on short-frame rejection in tun_xdp_one() (CVE-2026-46321)
In the Linux kernel, the following vulnerability has been resolved:
tun: free page on build_skb failure in tun_xdp_one() (CVE-2026-46322)
In the Linux kernel, the following vulnerability has been resolved:
net/sched: fix pedit partial COW leading to page cache corruption (CVE-2026-46331)
In the Linux kernel, the following vulnerability has been resolved:
RDMA: During rereg_mr ensure that REREG_ACCESS is compatible (CVE-2026-52908)
In the Linux kernel, the following vulnerability has been resolved:
bpf: Free reuseport cBPF prog after RCU grace period. (CVE-2026-52910)
In the Linux kernel, the following vulnerability has been resolved:
ipc: limit next_id allocation to the valid ID range (CVE-2026-52923)
In the Linux kernel, the following vulnerability has been resolved:
sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ebtables: fix OOB read in compat_mtw_from_user (CVE-2026-52927)
In the Linux kernel, the following vulnerability has been resolved:
sctp: stream: fully roll back denied add-stream state (CVE-2026-52929)
In the Linux kernel, the following vulnerability has been resolved:
ipc/shm: serialize orphan cleanup with shm_nattch updates (CVE-2026-52930)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_log: validate MAC header was set before dumping it (CVE-2026-52942)
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: fix missing zerocopy reference in pskb_carve helpers (CVE-2026-52943)
In the Linux kernel, the following vulnerability has been resolved:
fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling (CVE-2026-52946)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: require Ethernet MAC header before using eth_hdr() (CVE-2026-53131)
In the Linux kernel, the following vulnerability has been resolved:
vsock/virtio: fix potential unbounded skb queue (CVE-2026-53132)
In the Linux kernel, the following vulnerability has been resolved:
RDMA/umem: Fix truncation for block sizes >= 4G (CVE-2026-53133)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_fib: fix stale stack leak via the OIFNAME register (CVE-2026-53134)
In the Linux kernel, the following vulnerability has been resolved:
mm/hugetlb: restore reservation on error in hugetlb folio copy paths (CVE-2026-53154)
In the Linux kernel, the following vulnerability has been resolved:
nvmem: core: fix use-after-free bugs in error paths (CVE-2026-53156)
In the Linux kernel, the following vulnerability has been resolved:
fuse: reject fuse_notify() pagecache ops on directories (CVE-2026-53168)
In the Linux kernel, the following vulnerability has been resolved:
timers/migration: Fix livelock in tmigr_handle_remote_up() (CVE-2026-53180)
In the Linux kernel, the following vulnerability has been resolved:
mptcp: allow subflow rcv wnd to shrink (CVE-2026-53183)
In the Linux kernel, the following vulnerability has been resolved:
udp: clear skb->dev before running a sockmap verdict (CVE-2026-53184)
In the Linux kernel, the following vulnerability has been resolved:
mm/huge_memory: update file PMD counter before folio_put() (CVE-2026-53189)
In the Linux kernel, the following vulnerability has been resolved:
drm/virtio: fix dma_fence refcount leak on error in virtio_gpu_dma_fence_wait() (CVE-2026-53190)
In the Linux kernel, the following vulnerability has been resolved:
io_uring/net: inherit IORING_CQE_F_BUF_MORE across bundle recv retries (CVE-2026-53191)
In the Linux kernel, the following vulnerability has been resolved:
hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf (CVE-2026-53199)
In the Linux kernel, the following vulnerability has been resolved:
mm/memory-failure: fix hugetlb_lock AA deadlock in get_huge_page_for_hwpoison (CVE-2026-53207)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_tunnel: fix use-after-free on object destroy (CVE-2026-53212)
In the Linux kernel, the following vulnerability has been resolved:
ipv6: Fix a potential NPD in cleanup_prefix_route()
addrconf_get_prefix_route() can return the fib6_null_entry sentinel
entry which has a NULL fib6_table pointer. Therefore, before setting the
route's expiration time, check that we are not working with this entry,
as otherwise a NPD will be triggered [1].
Note that the other callers of addrconf_get_prefix_route() are not
susceptible to this bug:
1. addrconf_prefix_rcv(): Requests a route with the 'RTF_ADDRCONF |
RTF_PREFIX_RT' flags which are not set on fib6_null_entry.
2. modify_prefix_route(): Fixed by commit a747e02430df ("ipv6: avoid
possible NULL deref in modify_prefix_route()").
3. __ipv6_ifa_notify(): Calls ip6_del_rt() which specifically checks for
fib6_null_entry and returns an error.
[1]
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[...]
Call Trace:
<TASK>
__kasan_check_byte (mm/kasan/common.c:573)
lock_acquire.part.0 (kernel/locking/lockdep.c:5842 (discriminator 1))
_raw_spin_lock_bh (kernel/locking/spinlock.c:182 (discriminator 1))
cleanup_prefix_route (net/ipv6/addrconf.c:1280)
ipv6_del_addr (net/ipv6/addrconf.c:1342)
inet6_addr_del.isra.0 (net/ipv6/addrconf.c:3119)
inet6_rtm_deladdr (net/ipv6/addrconf.c:4812)
rtnetlink_rcv_msg (net/core/rtnetlink.c:6997)
netlink_rcv_skb (net/netlink/af_netlink.c:2555)
netlink_unicast (net/netlink/af_netlink.c:1344)
netlink_sendmsg (net/netlink/af_netlink.c:1899)
__sock_sendmsg (net/socket.c:802 (discriminator 4))
____sys_sendmsg (net/socket.c:2698)
___sys_sendmsg (net/socket.c:2752)
__sys_sendmsg (net/socket.c:2784)
do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) (CVE-2026-53214)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_exthdr: fix register tracking for F_PRESENT flag (CVE-2026-53218)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: x_tables: avoid leaking percpu counter pointers (CVE-2026-53219)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: revalidate bridge ports (CVE-2026-53220)
In the Linux kernel, the following vulnerability has been resolved:
ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup() (CVE-2026-53221)
In the Linux kernel, the following vulnerability has been resolved:
net: guard timestamp cmsgs to real error queue skbs (CVE-2026-53223)
In the Linux kernel, the following vulnerability has been resolved:
sctp: fix uninit-value in __sctp_rcv_asconf_lookup() (CVE-2026-53225)
In the Linux kernel, the following vulnerability has been resolved:
net: openvswitch: fix possible kfree_skb of ERR_PTR (CVE-2026-53227)
In the Linux kernel, the following vulnerability has been resolved:
ipv6: sit: reload inner IPv6 header after GSO offloads (CVE-2026-53228)
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: xsk: Fix DMA and xdp_frame leak on XDP_TX xmit failure (CVE-2026-53229)
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list (CVE-2026-53230)
In the Linux kernel, the following vulnerability has been resolved:
net: phy: clean the sfp upstream if phy probing fails (CVE-2026-53232)
In the Linux kernel, the following vulnerability has been resolved:
netdev: fix double-free in netdev_nl_bind_rx_doit() (CVE-2026-53233)
In the Linux kernel, the following vulnerability has been resolved:
net: add pskb_may_pull() to skb_gro_receive_list() (CVE-2026-53235)
In the Linux kernel, the following vulnerability has been resolved:
tcp: restrict SO_ATTACH_FILTER to priv users (CVE-2026-53236)
In the Linux kernel, the following vulnerability has been resolved:
netlabel: validate unlabeled address and mask attribute lengths (CVE-2026-53238)
In the Linux kernel, the following vulnerability has been resolved:
xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() (CVE-2026-53239)
In the Linux kernel, the following vulnerability has been resolved:
net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr (CVE-2026-53245)
In the Linux kernel, the following vulnerability has been resolved:
ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options (CVE-2026-53249)
In the Linux kernel, the following vulnerability has been resolved:
devlink: Release nested relation on devlink free (CVE-2026-53261)
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: bridge: make ebt_snat ARP rewrite writable (CVE-2026-53266)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_ct: bail out on template ct in get eval (CVE-2026-53267)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack_irc: fix possible out-of-bounds read (CVE-2026-53268)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: synproxy: add mutex to guard hook reference counting (CVE-2026-53269)
In the Linux kernel, the following vulnerability has been resolved:
ipvs: clear the svc scheduler ptr early on edit (CVE-2026-53270)
In the Linux kernel, the following vulnerability has been resolved:
erofs: fix use-after-free on sbi->sync_decompress (CVE-2026-53272)
In the Linux kernel, the following vulnerability has been resolved:
ipv6: mcast: Fix use-after-free when processing MLD queries (CVE-2026-53275)
In the Linux kernel, the following vulnerability has been resolved:
sched_ext: Don't warn on NULL cgrp_moving_from in scx_cgroup_move_task() (CVE-2026-53328)
In the Linux kernel, the following vulnerability has been resolved:
net: bonding: fix NULL pointer dereference in bond_do_ioctl()
In bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which
can return NULL if the requested interface name does not exist. However,
the subsequent slave_dbg() call is placed before the NULL check:
slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); //here
if (!slave_dev)
return -ENODEV;
The slave_dbg() macro expands to netdev_dbg(bond_dev, "(slave %s): " fmt,
(slave_dev)->name, ...) which unconditionally dereferences slave_dev->name
before the NULL check is performed. This results in a NULL pointer
dereference kernel oops when a user calls bonding ioctl (e.g.
SIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave
interface name.
This is reachable from userspace via the bonding ioctl interface with
CAP_NET_ADMIN capability, making it a potential local denial-of-service
vector.
Fix by moving the slave_dbg() call after the NULL check. (CVE-2026-53337)
In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't WARN if memory is dirtied without a vCPU when the VM is dying (CVE-2026-53345)
In the Linux kernel, the following vulnerability has been resolved:
drm/virtio: Fix driver removal with disabled KMS (CVE-2026-53347)
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_conntrack: destroy stale expectfn expectations on unregister
NAT helpers such as nf_nat_h323 store a raw pointer to module text in
exp->expectfn (e.g. ip_nat_q931_expect). nf_ct_helper_expectfn_unregister()
only unlinks the callback descriptor and never walks the expectation table,
so an expectation pending at module removal survives with a dangling
exp->expectfn into freed module text.
When the expected connection arrives, init_conntrack() invokes
exp->expectfn(), now a stale pointer into the unloaded module. Reproduced
on a KASAN build by loading the H.323 helpers, creating a Q.931
expectation, unloading nf_nat_h323, then connecting to the expected port:
Oops: int3: 0000 [#1] SMP KASAN NOPTI
RIP: 0010:0xffffffffa06102d1
init_conntrack.isra.0 (net/netfilter/nf_conntrack_core.c:1862)
nf_conntrack_in (net/netfilter/nf_conntrack_core.c:2049)
ipv4_conntrack_local (net/netfilter/nf_conntrack_proto.c:223)
nf_hook_slow (net/netfilter/core.c:619)
__ip_local_out (net/ipv4/ip_output.c:120)
__tcp_transmit_skb (net/ipv4/tcp_output.c:1715)
tcp_connect (net/ipv4/tcp_output.c:4374)
tcp_v4_connect (net/ipv4/tcp_ipv4.c:345)
__sys_connect (net/socket.c:2167)
Modules linked in: nf_conntrack_h323 [last unloaded: nf_nat_h323]
Reaching the dangling state requires CAP_SYS_MODULE in the initial user
namespace to remove a NAT helper that still has live expectations, so this
is a robustness fix; leaving an expectation pointing at freed text is wrong
regardless.
Add nf_ct_helper_expectfn_destroy(), which walks the expectation table and
drops every expectation whose ->expectfn matches the descriptor being torn
down. Call it from each NAT helper's exit path after the existing RCU grace
period, so no expectation outlives the code it points at and no extra
synchronize_rcu() is introduced. With the fix, the same reproducer runs to
completion without the Oops. (CVE-2026-53349)
In the Linux kernel, the following vulnerability has been resolved:
signal: clear JOBCTL_PENDING_MASK for caller in zap_other_threads()
When a multi-threaded process receives a stop signal (e.g., SIGSTOP),
do_signal_stop() sets JOBCTL_STOP_PENDING and JOBCTL_STOP_CONSUME on all
threads and sets signal->group_stop_count to the number of threads. If
one of the threads concurrently calls execve(), de_thread() invokes
zap_other_threads() to kill all other threads. zap_other_threads()
aborts the pending group stop by resetting signal->group_stop_count to 0
and clears the JOBCTL_PENDING_MASK for all other threads. However, it
fails to clear the job control flags for the calling thread.
When execve() completes, the calling thread returns to user mode and
checks for pending signals. Seeing the stale JOBCTL_STOP_PENDING flag,
it calls do_signal_stop(), which invokes task_participate_group_stop().
Since JOBCTL_STOP_CONSUME is still set, it attempts to decrement the
already-zero signal->group_stop_count, triggering a warning:
sig->group_stop_count == 0
WARNING: CPU: 1 PID: 6475 at kernel/signal.c:373
task_participate_group_stop+0x215/0x2d0
Call Trace:
<TASK>
do_signal_stop+0x3be/0x5c0 kernel/signal.c:2619
get_signal+0xa8c/0x1330 kernel/signal.c:2884
arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
Fix this race condition by clearing the JOBCTL_PENDING_MASK for the
calling thread in zap_other_threads(), ensuring it does not retain any
stale job control state after the thread group is destroyed. This aligns
with other functions that tear down a thread group and abort group
stops, such as zap_process() and complete_signal(), which correctly
clear these flags for all threads including the current one. (CVE-2026-53352)
In the Linux kernel, the following vulnerability has been resolved:
arm64: errata: Mitigate TLBI errata on various Arm CPUs
A number of CPUs developed by Arm suffer from errata whereby a broadcast
TLBI;DSB sequence may complete before the global observation of writes
which are translated by an affected TLB entry.
These errata ONLY affect the completion of memory accesses which have
been translated by an invalidated TLB entry, and these errata DO NOT
affect the actual invalidation of TLB entries. TLB entries are removed
correctly.
This issue has been assigned CVE ID CVE-2025-10263.
To mitigate this issue, Arm recommends that software follows any
affected TLBI;DSB sequence with an additional TLBI;DSB, which will
ensure that all memory write effects affected by the first TLBI have
been globally observed. The additional TLBI can use any operation that
is broadcast to affected CPUs, and the additional DSB can use any option
that is sufficient to complete the additional TLBI.
The ARM64_WORKAROUND_REPEAT_TLBI workaround is sufficient to mitigate
the issue. Enable this workaround for affected CPUs, and update the
silicon errata documentation accordingly.
Note that due to the manner in which Arm develops IP and tracks errata,
some CPUs share a common erratum number. (CVE-2026-53354)
In the Linux kernel, the following vulnerability has been resolved:
drm/i915/gem: Fix phys BO pread/pwrite with offset (CVE-2026-53356)
Affected Packages:
kernel6.12
Issue Correction:
Run dnf update kernel6.12 --releasever 2023.12.20260720 or dnf update --advisory ALAS2023-2026-1968 --releasever 2023.12.20260720 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
perf6.12-debuginfo-6.12.94-123.174.amzn2023.aarch64
kernel6.12-headers-6.12.94-123.174.amzn2023.aarch64
bpftool6.12-6.12.94-123.174.amzn2023.aarch64
kernel6.12-modules-extra-common-6.12.94-123.174.amzn2023.aarch64
python3-perf6.12-debuginfo-6.12.94-123.174.amzn2023.aarch64
kernel-livepatch-6.12.94-123.174-1.0-0.amzn2023.aarch64
bpftool6.12-debuginfo-6.12.94-123.174.amzn2023.aarch64
kernel6.12-debuginfo-6.12.94-123.174.amzn2023.aarch64
kernel6.12-6.12.94-123.174.amzn2023.aarch64
perf6.12-6.12.94-123.174.amzn2023.aarch64
kernel6.12-tools-6.12.94-123.174.amzn2023.aarch64
kernel6.12-tools-debuginfo-6.12.94-123.174.amzn2023.aarch64
python3-perf6.12-6.12.94-123.174.amzn2023.aarch64
kernel6.12-modules-extra-6.12.94-123.174.amzn2023.aarch64
kernel6.12-tools-devel-6.12.94-123.174.amzn2023.aarch64
kernel6.12-debuginfo-common-aarch64-6.12.94-123.174.amzn2023.aarch64
kernel6.12-devel-6.12.94-123.174.amzn2023.aarch64
src:
kernel6.12-6.12.94-123.174.amzn2023.src
x86_64:
kernel6.12-debuginfo-6.12.94-123.174.amzn2023.x86_64
kernel6.12-tools-debuginfo-6.12.94-123.174.amzn2023.x86_64
kernel6.12-headers-6.12.94-123.174.amzn2023.x86_64
perf6.12-6.12.94-123.174.amzn2023.x86_64
kernel6.12-modules-extra-6.12.94-123.174.amzn2023.x86_64
python3-perf6.12-6.12.94-123.174.amzn2023.x86_64
kernel6.12-modules-extra-common-6.12.94-123.174.amzn2023.x86_64
bpftool6.12-6.12.94-123.174.amzn2023.x86_64
perf6.12-debuginfo-6.12.94-123.174.amzn2023.x86_64
kernel6.12-tools-devel-6.12.94-123.174.amzn2023.x86_64
bpftool6.12-debuginfo-6.12.94-123.174.amzn2023.x86_64
python3-perf6.12-debuginfo-6.12.94-123.174.amzn2023.x86_64
kernel6.12-tools-6.12.94-123.174.amzn2023.x86_64
kernel-livepatch-6.12.94-123.174-1.0-0.amzn2023.x86_64
kernel6.12-6.12.94-123.174.amzn2023.x86_64
kernel6.12-debuginfo-common-x86_64-6.12.94-123.174.amzn2023.x86_64
kernel6.12-devel-6.12.94-123.174.amzn2023.x86_64