CVE-2024-35874: aio: Fix null ptr deref in aio_complete() wakeup

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-19 · updated 2026-08-04
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: aio: Fix null ptr deref in aio_complete() wakeup list_del_init_careful() needs to be the last access to the wait queue entry - it effectively unlocks access. Previously, finish_wait() would see the empty list head and skip taking the lock, and then we'd return - but the completion path would still attempt to do the wakeup after the task_struct pointer had been overwritten.

Affected products

Linux kernel: from 6.8 before 6.8.5; 6.9-rc1, 6.9-rc2 — fixed in 6.8.5

How to fix

Upgrade to a fixed version: Linux kernel 6.8.5. Check the vendor advisory for mitigations.

References

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