CVE-2023-52646: aio: fix mremap after fork null-deref

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: 2024-04-26 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: aio: fix mremap after fork null-deref Commit e4a0d3e720e7 ("aio: Make it possible to remap aio ring") introduced a null-deref if mremap is called on an old aio mapping after fork as mm->ioctx_table will be set to NULL. [jmoyer@redhat.com: fix 80 column issue]

Affected products

Linux kernel: from 3.19 before 4.14.306; from 4.15 before 4.19.273; from 4.20 before 5.4.232; from 5.5 before 5.10.169; from 5.11 before 5.15.95; from 5.16 before 6.1.13 — fixed in 4.14.306, 4.19.273, 5.10.169, 5.15.95, 5.4.232, 6.1.13

How to fix

Upgrade to a fixed version: Linux kernel 4.14.306, 4.19.273, 5.10.169, 5.15.95. Check the vendor advisory for mitigations.

References

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