{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80671", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.782Z", "datePublished": "2026-08-28T06:49:11.744Z", "dateUpdated": "2026-09-14T11:58:49.345Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-14T11:58:49.345Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.3, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is in userspace perf's builtin-sched.c reached only when a local user runs perf sched replay or perf sched latency against a crafted perf.data file via perf_session__process_events; it is not triggered by remote network packets, kernel syscalls, or in-kernel sched code.\nAC:L - The attacker fully controls untrusted perf.data sched_switch/sched_wakeup fields (prev_pid, next_pid, prev_comm, next_comm); large PIDs and overlong comm strings deterministically hit the integer-overflow realloc path or strcpy heap overflow without races or victim-specific memory layout.\nPR:N - In the malicious-trace threat model an external party needs no account or privileges on the victim host—they only supply a crafted perf.data file for a developer, support engineer, or CI job to analyze with perf sched replay/latency.\nUI:N - Once a trace is submitted to triage or CI, perf sched replay/latency parses perf.data non-interactively through perf_sched__read_events without further per-event operator actions beyond automated invocation of the perf command on the supplied file.\nS:C - Malicious sched metadata embedded in an externally supplied perf.data crosses from the untrusted reporter/artifact domain into the analyst or CI host security authority when perf parses that file, matching the kernel CNA untrusted-artifact model used for crafted filesystem images.\nC:H - Integer-overflow-driven out-of-bounds writes into the pid_to_task table and strcpy heap overflow past task_desc.comm[20] corrupt adjacent heap objects and can disclose process memory beyond a few bounded bytes.\nI:H - Attacker-controlled overflows corrupt task_desc function pointers and heap metadata (including the atoms pointer), providing controllable userspace memory corruption suitable for arbitrary write and code execution in the perf process.\nA:H - Pre-fix BUG_ON paths abort the perf process on allocation failure, and the heap out-of-bounds writes reliably crash or hang perf during register_pid() while parsing malicious perf.data." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "tools/perf/builtin-sched.c" ], "versions": [ { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "344e59fc4f2cba6dc04ce5e2a77388645d4ca834", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "22263d241bad753217d545f8085b7ead52e2873b", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "2003918e13f43cf6c5698be3cc9aa3657dd676a8", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "29639f00bfa49da7904ba0a499e0da7a0e5d735e", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "261d2b5f4afa0570ca906e553c93811c5abe4590", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "652cea73b7b7b7c622a2be670e44e3c499c6d49f", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "5ea1dcc9418c4e06ce29ed5170596f497ba86872", "status": "affected", "versionType": "git" }, { "version": "ec156764d424dd67283c2cd5e9f6f1b8388364ac", "lessThan": "5949d339f5ec98752d56dcd4e36f619a59d513a5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "tools/perf/builtin-sched.c" ], "versions": [ { "version": "2.6.32", "status": "affected" }, { "version": "0", "lessThan": "2.6.32", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/344e59fc4f2cba6dc04ce5e2a77388645d4ca834" }, { "url": "https://git.kernel.org/stable/c/22263d241bad753217d545f8085b7ead52e2873b" }, { "url": "https://git.kernel.org/stable/c/2003918e13f43cf6c5698be3cc9aa3657dd676a8" }, { "url": "https://git.kernel.org/stable/c/29639f00bfa49da7904ba0a499e0da7a0e5d735e" }, { "url": "https://git.kernel.org/stable/c/261d2b5f4afa0570ca906e553c93811c5abe4590" }, { "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" } } } }