SB2026072103 - Improper Check or Handling of Exceptional Conditions in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-63820)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper error handling in f2fs_read_data_large_folio() when processing large folio readahead after an error condition. A local user can trigger an error during file read operations to cause a denial of service.

Pending read completion can be left unsignaled for earlier folios, which may cause readers to wait indefinitely on locked folios.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/48c92559e7b66fdc3cbc74f6e152e66ec0150a0a
• https://git.kernel.org/stable/c/74c8d2ec95c59a5651ecd975c466998af1961fd4