CVE-2024-35815: fs/aio: Check IOCB_AIO_RW before the struct aio_kiocb conversion

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: 2024-05-17 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: fs/aio: Check IOCB_AIO_RW before the struct aio_kiocb conversion The first kiocb_set_cancel_fn() argument may point at a struct kiocb that is not embedded inside struct aio_kiocb. With the current code, depending on the compiler, the req->ki_ctx read happens either before the IOCB_AIO_RW test or after that test. Move the req->ki_ctx read such that it is guaranteed that the IOCB_AIO_RW test happens first.

Affected products

Debian Linux: 10.0
Linux kernel: from 4.19.308 before 4.19.312; from 5.4.270 before 5.4.274; from 5.10.211 before 5.10.215; from 5.15.150 before 5.15.154; from 6.1.80 before 6.1.84; from 6.6.19 before 6.6.24 — fixed in 4.19.312, 5.10.215, 5.15.154, 5.4.274, 6.1.84, 6.6.24

How to fix

Upgrade to a fixed version: Linux kernel 4.19.312, 5.10.215, 5.15.154, 5.4.274. Check the vendor advisory for mitigations.

References

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