PT-2026-20423 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-02-18 · CVE-2026-23211

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel related to swap address space management. A commit intended to mark the swap address space as read-only inadvertently introduced a potential for kernel panics under conditions of heavy memory pressure. Specifically, if arch prepare to swap returns a failure, a kernel panic can occur during memory reclamation. The issue is triggered by the read-only swap address space and is associated with function calls including el1 abort, shrink folio list, and do page fault. Restoring the swap address space to a non-read-only state resolves the problem.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Related Identifiers

CVE-2026-23211

Affected Products

Linux Kernel

References · 14

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23211.json · Exploit
• https://git.kernel.org/stable/c/a0f3c0845a4ff68d403c568266d17e9cc553e561 · Patch
• https://cve.org/CVERecord?id=CVE-2026-23211 · Security Note
• https://osv.dev/vulnerability/CVE-2026-23211 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23211 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23211 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23211 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23211 · Vendor Advisory
• https://git.kernel.org/stable/c/b0020cbd26380177b9fb8b7e75a8f7bdba79db20 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-23211 · Vendor Advisory
• https://git.kernel.org/linus/a0f3c0845a4ff68d403c568266d17e9cc553e561 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://t.me/CVEtracker/44981 · Telegram Post
• https://twitter.com/CVEnew/status/2024138074679390407 · Twitter Post