CVE-2026-80671: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
Vulnerability summary
CVE-2026-80671 is a critical (CVSS 9.3) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.8% of scored vulnerabilities.
Severe, CVSS 9.3 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 05-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 6Timeline
- 28-08-2026PublishedVulnerability first disclosed.
- 14-09-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- NVDNIST9.3CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.16% on 06-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu169 products
- linuxAll versions (No fix recorded) | < 5.15.0-202.212 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1119.126 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.1.5-1
- linux-6.12< 6.12.111-1~deb12u1
Linux1 product
- linux≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 344e59fc4f2cba6dc04ce5e2a77388645d4ca834 | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 22263d241bad753217d545f8085b7ead52e2873b | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 2003918e13f43cf6c5698be3cc9aa3657dd676a8 | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 29639f00bfa49da7904ba0a499e0da7a0e5d735e | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 261d2b5f4afa0570ca906e553c93811c5abe4590 | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 652cea73b7b7b7c622a2be670e44e3c499c6d49f | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 5ea1dcc9418c4e06ce29ed5170596f497ba86872 | ≥ ec156764d424dd67283c2cd5e9f6f1b8388364ac, < 5949d339f5ec98752d56dcd4e36f619a59d513a5 | 2.6.32
3 vendors · 172 products
