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CVE-2026-74628— net/x25: fix use-after-free of the socket by its timers

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： 网络层 x25：修复由定时器引起的 socket 释放后使用（use-after-free）漏洞 x25 的定时器通过 启用，并通过 取消。因此，待处理的定时器并不持有对 socket 的引用，且取消操作不会等待已在其他 CPU 上运行的回调函数结束。 还会无条件地重新启用定时器，这导致在 已通过其取消点后， 仍可能被重新安装。此时，后续的 会在定时器仍处于排队状态时释放 socket 内存，而下次定时器触发时将访问已释放的内存。KASAN 报告称在由 释放的 slab 对

CVSS 9.8 · Critical EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6b79659590f0f82a9b8efd2ffd55ec6399ebfc33 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fdd9ac50b9b61ef2b2d52c5156aff788be91454d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1fc9f6d2c7c9fdb341bfe8ca449c990632299ea6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3c4919be5d910db4beebca420953858606fba7d8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4bc522b33438fefc3272840ae5988771863a4f1f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e92c7e2b41d1528a830bc64c5e4e46dfa8133dda affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2195424c3da2ef1829a63b807e3a900a90e57d85 affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-74628

Vulnerability Information
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Vulnerability Title
net/x25: fix use-after-free of the socket by its timers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free of the socket by its timers The x25 timers are armed with mod_timer() and cancelled with timer_delete(), so a pending timer holds no reference on the socket and a cancel does not wait for a callback already running on another CPU. x25_heartbeat_expiry() also rearms unconditionally, so it can reinstall sk->sk_timer after __x25_destroy_socket() has passed its cancel point. The following __sock_put() frees the socket while the timer is still queued, and the next expiry uses freed memory. KASAN reports a slab-use-after-free on the kmalloc-2k object freed by close(). timer_delete_sync() cannot be used here: x25_heartbeat_expiry() and x25_timer_expiry() both reach the cancels from inside the timer they would wait on, through __x25_destroy_socket() and x25_disconnect(). Arm the timers with sk_reset_timer() and cancel them with sk_stop_timer() so that an armed timer owns a reference, and release it in both expiry handlers. Rearm the heartbeat only while sk_hashed(sk) is still true, since __x25_destroy_socket() unlinks the socket before dropping it. Arm the deferred destroy timer the same way and drop its reference in x25_destroy_timer(). Reproduced on net with KASAN, with the heartbeat period shortened so the window recurs. With this patch the reproducer no longer triggers a report and /proc/net/x25 drains. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 6b79659590f0f82a9b8efd2ffd55ec6399ebfc33 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-74628

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III. Intelligence Information for CVE-2026-74628

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Patches & Fixes for CVE-2026-74628 (7)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment
CVE-2026-74702 8.8 HIGH vhost-scsi: reject feature changes after endpoint

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74628

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