CVE-2026-68141

In the Linux kernel, the following vulnerability has been resolved: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC. If the allocation fails, nsk is NULL. The connection-refused path is entered when the listen state check fails, the accept backlog is full, or nsk is NULL. The code unconditionally calls iucv_sock_kill(nsk) in that path. iucv_sock_kill() does not accept a NULL socket pointer and immediately dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL, calling iucv_sock_kill(nsk) results in a NULL pointer dereference. Only call iucv_sock_kill() when a child socket was successfully allocated.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2026-08-10

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

References

• https://git.kernel.org/stable/c/07e21deb3664001995e0a456dd627ab7dbe127ec
• https://git.kernel.org/stable/c/0e857185591fe79934427c9c0c1c31dc776be134
• https://git.kernel.org/stable/c/33736ff5e7c97d3348ce812e8bd2e125d840743c
• https://git.kernel.org/stable/c/46453b16f38ec7147351f7447e2aec6ea330f7b3
• https://git.kernel.org/stable/c/47a5116e56a6b6fe1e909f244e39cd0fc26ceee4

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