SB2026070261 - Improper resource shutdown or release in Linux kernel arm64 mm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-53342)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

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 shutdown in free_hotplug_pgtable_page() when freeing hot-removed page tables. A local user can trigger memory hot-remove operations to cause a denial of service.

With DEBUG_VM enabled, the issue can trigger a bad page state warning. If ALLOC_SPLIT_PTLOCKS is defined, it can also leak page table lock allocations and corrupt NR_PAGETABLE accounting.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/95f27fcda681021ed3906d3cae7e68b6a57a1d8e
• https://git.kernel.org/stable/c/aaa688ac9f18207f7452c6472e647c1febaea6a3
• https://git.kernel.org/stable/c/c594b83457ccdee76d458416fb3bc9348a37592f