CVE-2024-26832
In the Linux kernel, the following vulnerability has been resolved: mm: zswap: fix missing folio cleanup in writeback race path In zswap_writeback_entry(), after we get a folio from __read_swap_cache_async(), we grab the tree lock again to check that…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: mm: zswap: fix missing folio cleanup in writeback race path In zswap_writeback_entry(), after we get a folio from __read_swap_cache_async(), we grab the tree lock again to check that the swap entry was not invalidated and recycled. If it was, we delete the folio we just added to the swap cache and exit. However, __read_swap_cache_async() returns the folio locked when it is newly allocated, which is always true for this path, and the folio is ref'd. Make sure to unlock and put the folio before returning. This was discovered by code inspection, probably because this path handles a race condition that should not happen often, and the bug would not crash the system, it will only strand the folio indefinitely.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-459
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffeaPatch
- https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644Patch
- https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abePatch
- https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1dPatch
- https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffeaPatch
- https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644Patch
- https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abePatch
- https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.