CVE-2026-80671

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

CVSS 3.1 9.3 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-80671

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-80671

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "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"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "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"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON