perf sched: Fix register_pid() overflow, strcpy, and BUG_ON

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80671
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:52 UTC
Updated2026-08-28 08:16:52 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ec156764d424dd67283c2cd5e9f6f1b8388364ac 652cea73b7b7b7c622a2be670e44e3c499c6d49f git Not specified
CNA Linux Linux affected ec156764d424dd67283c2cd5e9f6f1b8388364ac 5ea1dcc9418c4e06ce29ed5170596f497ba86872 git Not specified
CNA Linux Linux affected ec156764d424dd67283c2cd5e9f6f1b8388364ac 5949d339f5ec98752d56dcd4e36f619a59d513a5 git Not specified
CNA Linux Linux affected 2.6.32 Not specified
CNA Linux Linux unaffected 2.6.32 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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