{"id":"CVE-2026-80671","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf sched: Fix register_pid() overflow, strcpy, and BUG_ON\n\nregister_pid() has several issues when processing untrusted perf.data:\n\n1","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf sched: Fix register_pid() overflow, strcpy, and BUG_ON\n\nregister_pid() has several issues when processing untrusted perf.data:\n\n1. Integer overflow: (pid + 1) * si…","severity":"critical","cvss":9.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 344e59fc4f2cba6dc04ce5e2a77388645d4ca834","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 22263d241bad753217d545f8085b7ead52e2873b","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 2003918e13f43cf6c5698be3cc9aa3657dd676a8","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 29639f00bfa49da7904ba0a499e0da7a0e5d735e","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 261d2b5f4afa0570ca906e553c93811c5abe4590","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 652cea73b7b7b7c622a2be670e44e3c499c6d49f","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 5ea1dcc9418c4e06ce29ed5170596f497ba86872","Linux >= ec156764d424dd67283c2cd5e9f6f1b8388364ac < 5949d339f5ec98752d56dcd4e36f619a59d513a5","Linux 2.6.32"],"published":"2026-08-28","updated":"2026-09-14","sourceUpdated":"2026-09-14T13:18:48.167","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80671","references":[{"url":"https://git.kernel.org/stable/c/2003918e13f43cf6c5698be3cc9aa3657dd676a8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/22263d241bad753217d545f8085b7ead52e2873b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/261d2b5f4afa0570ca906e553c93811c5abe4590","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/29639f00bfa49da7904ba0a499e0da7a0e5d735e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/344e59fc4f2cba6dc04ce5e2a77388645d4ca834","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00158,"epssPercentile":0.05424,"ingestedAt":"2026-08-30T04:47:10.082Z","slug":"CVE-2026-80671","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nperf sched: Fix register_pid() overflow, strcpy, and BUG_ON\n\nregister_pid() has several issues when processing untrusted perf.data:\n\n1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap\n   to a small value on 32-bit systems when pid is large (e.g.\n   0x40000000), causing realloc to return a tiny buffer followed by\n   out-of-bounds writes in the initialization loop.\n\n2. Heap buffer overflow: strcpy(task->comm, comm) copies the\n   untrusted comm string into a fixed 20-byte COMM_LEN buffer with\n   no length check.\n\n3. BUG_ON on allocation failure: perf.data is untrusted input, so\n   allocation failures should be handled gracefully rather than\n   killing the process.\n\n4. Realloc of sched->tasks assigned directly back, leaking the old\n   pointer on failure; nr_tasks incremented before the realloc,\n   leaving corrupted state on failure.\n\nCap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum\non 64-bit), replace strcpy with strlcpy, guard against NULL comm,\nreplace BUG_ON with NULL returns using safe realloc patterns, and\nadd NULL checks in callers that dereference the result.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":51.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}