{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64111", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.035Z", "datePublished": "2026-07-19T15:40:13.007Z", "dateUpdated": "2026-08-05T12:39:20.048Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:20.048Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlsm: hold cred_guard_mutex for lsm_set_self_attr()\n\nJust as proc_pid_attr_write() already does before calling the LSM\nhook. This only matters for SELinux and AppArmor which check\nwhether the process is being ptraced and if so, whether to\nallow the transition." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires invoking the `lsm_set_self_attr` syscall (NR 460), which is strictly a local kernel entry point with no network, adjacent-wireless, or physical-device path to the vulnerable code.\nAC:L - The bug is a TOCTOU race between `lsm_set_self_attr` and concurrent ptrace attach/detach; an attacker can control both the tracee thread issuing the syscall and a tracer thread (e.g., via fork/PTRACE_TRACEME), making the race reliably winnable without conditions outside attacker control.\nPR:L - Any unprivileged local user can reach `sys_lsm_set_self_attr`; there is no capability or root requirement at the syscall boundary, and ptrace coordination is achievable within the same UID via standard unprivileged ptrace APIs.\nUI:N - Exploitation does not require any action from a separate victim user such as opening a file or mounting a filesystem; the attacker drives both the setattr syscall and the ptrace race directly.\nS:U - Successful exploitation changes the calling process's LSM credentials within the same kernel/OS security authority (SELinux domain or AppArmor profile transition), constituting standard local MAC bypass rather than crossing a VM, container-host, or IOMMU boundary.\nC:H - Bypassing the ptrace-mediated transition check allows committing a new SELinux SID or AppArmor profile without tracer authorization, granting read access to data and resources denied under the prior confined context.\nI:H - The attack culminates in `commit_creds()` with an unauthorized LSM security context (SELinux `crsec->sid` or AppArmor label replacement), constituting arbitrary modification of the process's mandatory access control identity and associated permissions.\nA:N - The vulnerability is a missing mutex enabling a policy-bypass race; it does not involve memory corruption, kernel oops, panic, hang, or other availability-impacting failure modes." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/lsm_syscalls.c" ], "versions": [ { "version": "a04a1198088a1378d0389c250cc684f649bcc91e", "lessThan": "82d3acee88593e3d9e71cad4b7d6b3cf70de9d07", "status": "affected", "versionType": "git" }, { "version": "a04a1198088a1378d0389c250cc684f649bcc91e", "lessThan": "5b906f31e977286888a9e31282589b545b249139", "status": "affected", "versionType": "git" }, { "version": "a04a1198088a1378d0389c250cc684f649bcc91e", "lessThan": "a010cadaf5727b8417f62fe9021fcef14a5f9b51", "status": "affected", "versionType": "git" }, { "version": "a04a1198088a1378d0389c250cc684f649bcc91e", "lessThan": "4a9b16541ad3faf8bccb398532bf3f8b6bbf1188", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/lsm_syscalls.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.8", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/82d3acee88593e3d9e71cad4b7d6b3cf70de9d07" }, { "url": "https://git.kernel.org/stable/c/5b906f31e977286888a9e31282589b545b249139" }, { "url": "https://git.kernel.org/stable/c/a010cadaf5727b8417f62fe9021fcef14a5f9b51" }, { "url": "https://git.kernel.org/stable/c/4a9b16541ad3faf8bccb398532bf3f8b6bbf1188" } ], "title": "lsm: hold cred_guard_mutex for lsm_set_self_attr()", "x_generator": { "engine": "bippy-1.2.0" } } } }