{"api_version":"1","generated_at":"2026-08-28T10:38:11+00:00","cve":"CVE-2026-80671","urls":{"html":"https://cve.report/CVE-2026-80671","api":"https://cve.report/api/cve/CVE-2026-80671.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80671","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80671"},"summary":{"title":"perf sched: Fix register_pid() overflow, strcpy, and BUG_ON","description":"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) * 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:52","updated_at":"2026-08-28 08:16:52"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872","name":"https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5","name":"https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f","name":"https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80671","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80671","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec156764d424dd67283c2cd5e9f6f1b8388364ac 652cea73b7b7b7c622a2be670e44e3c499c6d49f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec156764d424dd67283c2cd5e9f6f1b8388364ac 5ea1dcc9418c4e06ce29ed5170596f497ba86872 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec156764d424dd67283c2cd5e9f6f1b8388364ac 5949d339f5ec98752d56dcd4e36f619a59d513a5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.32","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.32 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["tools/perf/builtin-sched.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"652cea73b7b7b7c622a2be670e44e3c499c6d49f","status":"affected","version":"ec156764d424dd67283c2cd5e9f6f1b8388364ac","versionType":"git"},{"lessThan":"5ea1dcc9418c4e06ce29ed5170596f497ba86872","status":"affected","version":"ec156764d424dd67283c2cd5e9f6f1b8388364ac","versionType":"git"},{"lessThan":"5949d339f5ec98752d56dcd4e36f619a59d513a5","status":"affected","version":"ec156764d424dd67283c2cd5e9f6f1b8388364ac","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["tools/perf/builtin-sched.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.32"},{"lessThan":"2.6.32","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"2.6.32","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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) * 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."}],"providerMetadata":{"dateUpdated":"2026-08-28T06:49:11.744Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f"},{"url":"https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872"},{"url":"https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5"}],"title":"perf sched: Fix register_pid() overflow, strcpy, and BUG_ON","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80671","datePublished":"2026-08-28T06:49:11.744Z","dateReserved":"2026-08-26T14:34:25.782Z","dateUpdated":"2026-08-28T06:49:11.744Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:52","lastModifiedDate":"2026-08-28 08:16:52","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80671","Ordinal":"1","Title":"perf sched: Fix register_pid() overflow, strcpy, and BUG_ON","CVE":"CVE-2026-80671","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80671","Ordinal":"1","NoteData":"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) * 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.","Type":"Description","Title":"perf sched: Fix register_pid() overflow, strcpy, and BUG_ON"}]}}}