CVE-2026-80671perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
- 9.3CriticalCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON register_pid() has several issues when processing untrusted perf.data: 1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap to a small value on 32-bit systems when pid is large (e.g. 0x40000000), causing realloc to return a tiny buffer followed by out-of-bounds writes in the initialization loop. 2. Heap buffer overflow: strcpy(task->comm, comm) copies the untrusted comm string into a fixed 20-byte COMM_LEN buffer with no length check. 3. BUG_ON on allocation failure: perf.data is untrusted input, so allocation failures should be handled gracefully rather than killing the process. 4. Realloc of sched->tasks assigned directly back, leaking the old pointer on failure; nr_tasks incremented before the realloc, leaving corrupted state on failure. Cap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum on 64-bit), replace strcpy with strlcpy, guard against NULL comm, replace BUG_ON with NULL returns using safe realloc patterns, and add NULL checks in callers that dereference the result.
Timeline
ID reserved
By Linux
- 2 days later
· 2 days later
Published
- 17 days later
· 17 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.
Affected products
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 344e59fc4f2cba6dc04ce5e2a77388645d4ca834
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 22263d241bad753217d545f8085b7ead52e2873b
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 2003918e13f43cf6c5698be3cc9aa3657dd676a8
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 29639f00bfa49da7904ba0a499e0da7a0e5d735e
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 261d2b5f4afa0570ca906e553c93811c5abe4590
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 652cea73b7b7b7c622a2be670e44e3c499c6d49f
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 5ea1dcc9418c4e06ce29ed5170596f497ba86872
- affected ec156764d424dd67283c2cd5e9f6f1b8388364ac – < 5949d339f5ec98752d56dcd4e36f619a59d513a5
- affected 2.6.32
- unaffected < 2.6.32
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/344e59fc4f2cba6dc04ce5e2a77388645d4ca834 (opens in a new tab)
- https://git.kernel.org/stable/c/22263d241bad753217d545f8085b7ead52e2873b (opens in a new tab)
- https://git.kernel.org/stable/c/2003918e13f43cf6c5698be3cc9aa3657dd676a8 (opens in a new tab)
- https://git.kernel.org/stable/c/29639f00bfa49da7904ba0a499e0da7a0e5d735e (opens in a new tab)
- https://git.kernel.org/stable/c/261d2b5f4afa0570ca906e553c93811c5abe4590 (opens in a new tab)
- https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f (opens in a new tab)
- https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872 (opens in a new tab)
- https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-67547 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80671)Record last updated .