CVE-2026-68141

HighCVSS 7.5

Published: 10/08/2026(UTC)Updated: 19/08/2026(UTC)Translated: 10/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.47%

39th percentile - higher than 39% of all known CVEs

Summary

In the Linux kernel's net/af_iucv subsystem, there is a NULL pointer dereference vulnerability in afiucv_hs_callback_syn(). When child socket allocation fails, nsk is NULL, and the connection-refused path unconditionally calls iucv_sock_kill(nsk), leading to a crash. The fix only calls iucv_sock_kill() when a child socket was successfully allocated.

Risk Assessment

An attacker could cause a kernel panic by exhausting memory, leading to denial of service (DoS).

Recommendation

Apply the official Linux kernel patch that fixes this issue and reboot the system.

Original NVD description (English source)

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.