NULL pointer dereference in Linux
CVE-2022-49699
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.
EPSS: 0.002 (13.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions cbd59c48ae2bcadc4a7599c29cf32fd3f9b78251, 5.12, 0
- Linux Linux_kernel — versions 5.19
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2022-49699?
- CVE-2022-49699 is a medium-severity vulnerability in Linux, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2025-02-26.
- How severe is CVE-2022-49699?
- Medium severity. CVSS v3 base score is 5.5 out of 10.