Riskcovery

CVE-2022-49699

filemap: Handle sibling entries in filemap_get_read_batch()

State
Published
Severity
Not scored
Published
Feb 26, 2025
Updated
May 11, 2026
Reserved
Feb 26, 2025

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 to before a66f131d30e53000f08301776bf85c912ef47aadAffected
  • cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251 to before cb995f4eeba9d268fd4b56c2423ad6c1d1ea1b82Affected
LinuxLinux
  • 5.12Affected
  • before 5.12Not affected
  • 5.18.8 through 5.18.*Not affected
  • 5.19 and laterNot affected

References

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