SB20261007142 - Incorrect calculation in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-98226)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt swap accounting and availability lists and cause loss of swapped-out pages.

The vulnerability exists due to an incorrect flag-bit calculation in mm/swapfile.c when tracking swap usage with a counter that also stores the off-list flag. A local user can trigger swap usage updates with bit 30 set in the actual usage count to corrupt swap accounting and availability lists and cause loss of swapped-out pages.

On systems with 4 KiB pages, the flag overlaps the usage count at 4 TiB of swap usage. Page loss requires swapoff to run when the raw usage count is exactly 2^30 pages; availability-list corruption can occur during normal swap use without swapoff.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a41a46859df0d2bd7ed127197aac7c7389c00ed
• https://git.kernel.org/stable/c/12e9ac7bc5b254048f886bf421e3a15491106c1f
• https://git.kernel.org/stable/c/7c0d0d6de46076b43a2acaf1026b6648f8434c39