DEBIAN-CVE-2026-23127

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Source
https://security-tracker.debian.org/tracker/CVE-2026-23127
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23127.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-23127
Upstream
Published
2026-02-14T15:16:07.963Z
Modified
2026-03-19T09:00:26.368368Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved: perf: Fix refcount warning on event->mmapcount increment When calling refcountinc(&event->mmapcount) inside perfmmaprb(), the following warning is triggered: refcountt: addition on 0; use-after-free. WARNING: lib/refcount.c:25 PoC: struct perfeventattr attr = {0}; int fd = syscall(_NRperfeventopen, &attr, 0, -1, -1, 0); mmap(NULL, 0x3000, PROTREAD | PROTWRITE, MAPSHARED, fd, 0); int victim = syscall(NRperfeventopen, &attr, 0, -1, fd, PERFFLAGFDOUTPUT); mmap(NULL, 0x3000, PROTREAD | PROTWRITE, MAPSHARED, victim, 0); This occurs when creating a group member event with the flag PERFFLAGFDOUTPUT. The group leader should be mmap-ed and then mmap-ing the event triggers the warning. Since the event has copied the outputevent in perfeventsetoutput(), event->rb is set. As a result, perfmmaprb() calls refcountinc(&event->mmapcount) when event->mmapcount = 0. Disallow the case when event->mmapcount = 0. This also prevents two events from updating the same userpage.

References

Affected packages

Debian:14 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.18.8-1

Affected versions

6.*
6.12.38-1
6.12.41-1
6.12.43-1~bpo12+1
6.12.43-1
6.12.48-1
6.12.57-1~bpo12+1
6.12.57-1
6.12.63-1~bpo12+1
6.12.63-1
6.12.69-1~bpo12+1
6.12.69-1
6.12.73-1~bpo12+1
6.12.73-1
6.12.74-1
6.12.74-2~bpo12+1
6.12.74-2
6.13~rc6-1~exp1
6.13~rc7-1~exp1
6.13.2-1~exp1
6.13.3-1~exp1
6.13.4-1~exp1
6.13.5-1~exp1
6.13.6-1~exp1
6.13.7-1~exp1
6.13.8-1~exp1
6.13.9-1~exp1
6.13.10-1~exp1
6.13.11-1~exp1
6.14.3-1~exp1
6.14.5-1~exp1
6.14.6-1~exp1
6.15~rc7-1~exp1
6.15-1~exp1
6.15.1-1~exp1
6.15.2-1~exp1
6.15.3-1~exp1
6.15.4-1~exp1
6.15.5-1~exp1
6.15.6-1~exp1
6.16~rc7-1~exp1
6.16-1~exp1
6.16.1-1~exp1
6.16.3-1~bpo13+1
6.16.3-1
6.16.5-1
6.16.6-1
6.16.7-1
6.16.8-1
6.16.9-1
6.16.10-1
6.16.11-1
6.16.12-1~bpo13+1
6.16.12-1
6.16.12-2
6.17.2-1~exp1
6.17.5-1~exp1
6.17.6-1
6.17.7-1
6.17.7-2
6.17.8-1~bpo13+1
6.17.8-1
6.17.9-1
6.17.10-1
6.17.11-1
6.17.12-1
6.17.13-1~bpo13+1
6.17.13-1
6.18~rc4-1~exp1
6.18~rc4-1~exp2
6.18~rc5-1~exp1
6.18~rc6-1~exp1
6.18~rc7-1~exp1
6.18.1-1~exp1
6.18.2-1~exp1
6.18.3-1
6.18.5-1~bpo13+1
6.18.5-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23127.json"