CVE-2022-39188

Severity: medium (CVSS 4.7 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: 2022-09-02 · updated 2026-10-14
Weakness: CWE-362

Description

An issue was discovered in include/asm-generic/tlb.h in the Linux kernel before 5.19. Because of a race condition (unmap_mapping_range versus munmap), a device driver can free a page while it still has stale TLB entries. This only occurs in situations with VM_PFNMAP VMAs.

Affected products

Debian Linux: 10.0, 11.0
Linux kernel: before 5.19 — fixed in 5.19

How to fix

Upgrade to a fixed version: Linux kernel 5.19. Check the vendor advisory for mitigations.

References

https://bugs.chromium.org/p/project-zero/issues/detail?id=2329
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b67fbebd4cf980aecbcc750e1462128bffe8ae15
https://github.com/torvalds/linux/commit/b67fbebd4cf980aecbcc750e1462128bffe8ae15
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
https://lore.kernel.org/stable/CAG48ez3SEqOPcPCYGHVZv4iqEApujD5VtM3Re-tCKLDEFdEdbg%40mail.gmail.com/
https://www.debian.org/security/2022/dsa-5257
https://bugs.chromium.org/p/project-zero/issues/detail?id=2329
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b67fbebd4cf980aecbcc750e1462128bffe8ae15
https://github.com/torvalds/linux/commit/b67fbebd4cf980aecbcc750e1462128bffe8ae15

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