What is CVE-2026-23248?

CVE-2026-23248 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2026-03-18.

How severe is CVE-2026-23248?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Linux

CVE-2026-23248

In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix refcount bug and potential UAF in perf_mmap Syzkaller reported a refcount_t: addition on 0; use-after-free warning in perf_mmap. The issue is caused by a…

Vulnerability class: Use-After-Free

EPSS: 0.000 (4.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions b709eb872e19a19607bbb6d2975bc264d59735cf, 6.14, 0
Linux Linux_kernel — versions 7.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-23248?: CVE-2026-23248 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2026-03-18.
How severe is CVE-2026-23248?: High severity. CVSS v3 base score is 7.8 out of 10.