PT-2026-4487 · Linux · Linux Kernel

Syzbot · Published 2026-01-01 · Updated 2026-01-24 · CVE-2026-22987

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’s networking scheduler related to traffic control and action API handling. Specifically, the issue involves a potential invalid memory dereference within the tcf idrinfo destroy() function during network namespace teardown. The tc act in hw() function could be called with an error pointer (ERR PTR(-EBUSY)), leading to a crash. The fix prevents calling tc act in hw() on error pointers by guarding against ERR PTR entries when iterating the action IDR.

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

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-22987

Affected Products

Linux Kernel

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22987.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-22987 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-22987 · Vendor Advisory
• https://git.kernel.org/stable/c/67550a1130b647bb0d093c9c0a810c69aa6a30a8 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-22987 · Security Note
• https://git.kernel.org/stable/c/adb25a46dc0a43173f5ea5f5f58fc8ba28970c7c · Patch
• https://ubuntu.com/security/CVE-2026-22987 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-22987 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-22987 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-22987 · Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/2014995858060914767 · Twitter Post
• https://git.kernel.org/linus/adb25a46dc0a43173f5ea5f5f58fc8ba28970c7c · Note