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CVE-2026-74262— kcm: use WRITE_ONCE() when changing lower socket callbacks

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于kcm_attach()函数在替换下层TCP套接字的sk_data_ready和sk_write_space回调时未使用WRITE_ONCE()，可能导致并发CPU观察到旧回调快照，造成回调执行不匹配，导致陈旧或误导的唤醒。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< 0cb3e2f40679032c1aa2186280a86e5ead0161ee affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< fa26e4606aed0f7fe793c325506adeda1d847a43 affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< b4ccd6eef671d7c44a30123cd29f3acf3de8468e affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< b8c90823cdfb5f3d22f261aeb3e9066612853c36 affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< 11faefd11ce2448bac7279ab302dd1954a6547fe affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< f01fb6138f8eb606b56ce9158e2d8b72352c53f4 affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< 9684fff87124b201e11dea01ded9173025359a0f affected
ab7ac4eb9832e32a09f4e8042705484d2fb0aad3< 47186409c092cd7dd70350999186c700233e854d affected
… +10 more rows
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I. Basic Information for CVE-2026-74262

Vulnerability Information
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Vulnerability Title
kcm: use WRITE_ONCE() when changing lower socket callbacks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: kcm: use WRITE_ONCE() when changing lower socket callbacks kcm_attach() replaces a live lower TCP socket's sk_data_ready and sk_write_space callbacks with KCM handlers, and kcm_unattach() restores them later. Those callback-pointer updates are still plain stores even though the same fields can be read and invoked concurrently on other CPUs. If another CPU observes an older callback snapshot after the live field has already been restored, callback execution can run with a mismatched target and sk_user_data state, leading to stale or misdirected wakeups. Use WRITE_ONCE() for the callback replacement and restore operations so these shared callback fields follow the same visibility contract already established by the earlier 4022 fixes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于kcm_attach()函数在替换下层TCP套接字的sk_data_ready和sk_write_space回调时未使用WRITE_ONCE()，可能导致并发CPU观察到旧回调快照，造成回调执行不匹配，导致陈旧或误导的唤醒。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ~ 0cb3e2f40679032c1aa2186280a86e5ead0161ee -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-74262

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III. Intelligence Information for CVE-2026-74262

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Patches & Fixes for CVE-2026-74262 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74262

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