CVE-2022-49699 (GCVE-0-2022-49699)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-05-04 08:43
VLAI?
Title
filemap: Handle sibling entries in filemap_get_read_batch()
Summary
In the Linux kernel, the following vulnerability has been resolved: filemap: Handle sibling entries in filemap_get_read_batch() If a read races with an invalidation followed by another read, it is possible for a folio to be replaced with a higher-order folio. If that happens, we'll see a sibling entry for the new folio in the next iteration of the loop. This manifests as a NULL pointer dereference while holding the RCU read lock. Handle this by simply returning. The next call will find the new folio and handle it correctly. The other ways of handling this rare race are more complex and it's just not worth it.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 , < a66f131d30e53000f08301776bf85c912ef47aad (git)
Affected: cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 , < cb995f4eeba9d268fd4b56c2423ad6c1d1ea1b82 (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.18.8 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.