SB20260727151 - NULL pointer dereference in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-64416)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 attacker to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in lookup_swap_cgroup_id() when processing a corrupted swap entry during page table teardown. A local attacker can corrupt a page table entry into a crafted swap entry to cause a denial of service.

The issue is triggered on swapless hosts, and a single corrupted page table entry can crash the host during process exit.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/63b02a9409cb5180398491b093e48bcb5315f5fb
• https://git.kernel.org/stable/c/6a4196d19f477524d2f92adca90fc1fbe9a0420a
• https://git.kernel.org/stable/c/818416fef38759f23210de449663cd9d7e293d39
• https://git.kernel.org/stable/c/b415c00bf23df577a4a95673d00ae76687bcc1d4