SB20260424261 - Improper control of a resource through its lifetime in Linux kernel iomap

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-31463)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper resource management in iomap_read_folio_iter() and iomap_read_end() when processing read I/O with a folio size that matches inode->i_blkbits but differs from the I/O granularity. A local user can trigger crafted read operations to cause a denial of service.

The issue occurs in the !ifs case where the current folio is not invalidated before read completion handling continues.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4a927f670cdb0def226f9f85f42a9f19d9e09c88
• https://git.kernel.org/stable/c/bd71fb3fea9945987053968f028a948997cba8cc