PT-2026-27745 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-03-27 · CVE-2026-23380

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 tracing buffer management. Specifically, a double-free condition can occur in the tracing buffers mmap close() function when a process forks and utilizes madvise(MADVISE DOFORK). This happens because the user-mapped reference count is not incremented during a fork, leading to a premature release of memory and a subsequent warning message. The issue arises when both parent and child processes exit, and the function is called twice, resulting in an error. The VM DONTCOPY flag, intended to prevent this, can be overridden by the application using madvise(MADVISE DOFORK), triggering the condition.

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

Exploit

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-23380

Affected Products

Linux Kernel

References · 18

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23380.json · Exploit
• https://git.kernel.org/stable/c/cdd96641b64297a2db42676f051362b76280a58b · Patch
• https://osv.dev/vulnerability/CVE-2026-23380 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-23380 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-23380 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23380 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23380 · Security Note
• https://git.kernel.org/stable/c/b0f269ba6fefe9e3cb9feedcf78fcd0b633800c0 · Patch
• https://ubuntu.com/security/CVE-2026-23380 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-23380 · Vendor Advisory
• https://git.kernel.org/stable/c/91f3e8d84c89918769e71393f839c9fefadc2580 · Patch
• https://git.kernel.org/stable/c/e39bb9e02b68942f8e9359d2a3efe7d37ae6be0e · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23380 · Vendor Advisory
• https://twitter.com/CVEnew/status/2036763462567612683 · Twitter Post
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note