CVE-2026-99169

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99169", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.398Z", "datePublished": "2026-10-28T10:35:20.170Z", "dateUpdated": "2026-10-30T12:42:34.724Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:42:34.724Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Fix mm reuse handling for FUT_OFF_MMSHARED\n\nA FUT_OFF_MMSHARED futex is a shared futex that refers to an MM.\nIt is possible for a process to wait on a shared futex with a different MM\nbecause a FUT_OFF_INODE waiter can be requeued onto a FUT_OFF_MMSHARED\nfutex by another process.\nThis can cause FUT_OFF_MMSHARED waiters on a freed MM to consume\nwakeups intended for a newly allocated MM at the same address.\n\nFix it by keying FUT_OFF_MMSHARED using a unique 64-bit per-MM ID.\nLeave private futexes as before to avoid influencing the performance of the\nhotpath.\n\n(Multi-threaded processes typically implicitly use FUT_OFF_MMSHARED by\nsetting clear_child_tid such that it points into anonymous memory, which\ncauses mm_release() in a multi-threaded mm to perform FUTEX_WAKE.)"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/futex.h", "include/linux/futex_types.h", "kernel/futex/core.c"], "versions": [{"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "096b5d4b80d19b1f7bf8e63fae0d0a32dbb6e1a2", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "a7aa4ce1b56a688fe4da75430ec7bf9fe3311807", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "f470b76584b5e32d9f9436ef78fb899914116d75", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "0c133ed51700036796318f038dde813976bf1227", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "16cc0fee39dffd9994b7bea676a886ed52206754", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "2855ddc6844f527e375e78afb55ec2a5182f23b3", "status": "affected", "versionType": "git"}, {"version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "lessThan": "3267512ad1c2cc0c7768c5b014dc2cceb398a801", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/futex.h", "include/linux/futex_types.h", "kernel/futex/core.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.7", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/096b5d4b80d19b1f7bf8e63fae0d0a32dbb6e1a2"}, {"url": "https://git.kernel.org/stable/c/a7aa4ce1b56a688fe4da75430ec7bf9fe3311807"}, {"url": "https://git.kernel.org/stable/c/f470b76584b5e32d9f9436ef78fb899914116d75"}, {"url": "https://git.kernel.org/stable/c/0c133ed51700036796318f038dde813976bf1227"}, {"url": "https://git.kernel.org/stable/c/16cc0fee39dffd9994b7bea676a886ed52206754"}, {"url": "https://git.kernel.org/stable/c/c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81"}, {"url": "https://git.kernel.org/stable/c/2855ddc6844f527e375e78afb55ec2a5182f23b3"}, {"url": "https://git.kernel.org/stable/c/3267512ad1c2cc0c7768c5b014dc2cceb398a801"}], "title": "futex: Fix mm reuse handling for FUT_OFF_MMSHARED", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/futex.h", "include/linux/futex_types.h", "kernel/futex/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "096b5d4b80d19b1f7bf8e63fae0d0a32dbb6e1a2", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "a7aa4ce1b56a688fe4da75430ec7bf9fe3311807", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "f470b76584b5e32d9f9436ef78fb899914116d75", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "0c133ed51700036796318f038dde813976bf1227", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "16cc0fee39dffd9994b7bea676a886ed52206754", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "2855ddc6844f527e375e78afb55ec2a5182f23b3", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}, {"lessThan": "3267512ad1c2cc0c7768c5b014dc2cceb398a801", "status": "affected", "version": "222993395ed38f3751287f4bd82ef46b3eb3a66d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/futex.h", "include/linux/futex_types.h", "kernel/futex/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Fix mm reuse handling for FUT_OFF_MMSHARED\n\nA FUT_OFF_MMSHARED futex is a shared futex that refers to an MM.\nIt is possible for a process to wait on a shared futex with a different MM\nbecause a FUT_OFF_INODE waiter can be requeued onto a FUT_OFF_MMSHARED\nfutex by another process.\nThis can cause FUT_OFF_MMSHARED waiters on a freed MM to consume\nwakeups intended for a newly allocated MM at the same address.\n\nFix it by keying FUT_OFF_MMSHARED using a unique 64-bit per-MM ID.\nLeave private futexes as before to avoid influencing the performance of the\nhotpath.\n\n(Multi-threaded processes typically implicitly use FUT_OFF_MMSHARED by\nsetting clear_child_tid such that it points into anonymous memory, which\ncauses mm_release() in a multi-threaded mm to perform FUTEX_WAKE.)"}], "id": "CVE-2026-99169", "lastModified": "2026-10-30T13:21:50.627", "metrics": {}, "published": "2026-10-28T11:17:37.403", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/096b5d4b80d19b1f7bf8e63fae0d0a32dbb6e1a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c133ed51700036796318f038dde813976bf1227"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16cc0fee39dffd9994b7bea676a886ed52206754"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2855ddc6844f527e375e78afb55ec2a5182f23b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3267512ad1c2cc0c7768c5b014dc2cceb398a801"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a7aa4ce1b56a688fe4da75430ec7bf9fe3311807"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c17cc2027773e8e4913c5ab0fe3a489b1ed5bf81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f470b76584b5e32d9f9436ef78fb899914116d75"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: futex: Fix mm reuse handling for FUT_OFF_MMSHARED", "id": "2562711", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562711"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-694", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfutex: Fix mm reuse handling for FUT_OFF_MMSHARED\nA FUT_OFF_MMSHARED futex is a shared futex that refers to an MM.\nIt is possible for a process to wait on a shared futex with a different MM\nbecause a FUT_OFF_INODE waiter can be requeued onto a FUT_OFF_MMSHARED\nfutex by another process.\nThis can cause FUT_OFF_MMSHARED waiters on a freed MM to consume\nwakeups intended for a newly allocated MM at the same address.\nFix it by keying FUT_OFF_MMSHARED using a unique 64-bit per-MM ID.\nLeave private futexes as before to avoid influencing the performance of the\nhotpath.\n(Multi-threaded processes typically implicitly use FUT_OFF_MMSHARED by\nsetting clear_child_tid such that it points into anonymous memory, which\ncauses mm_release() in a multi-threaded mm to perform FUTEX_WAKE.)", "A flaw was found in the Linux kernel's futex (fast userspace mutex) subsystem. A local user can cause a Denial of Service (DoS) by exploiting improper handling of shared waiters when memory is reused. By requeuing synchronization waiters across different memory contexts, a waiter tied to freed memory can intercept wakeups intended for newly allocated memory at the same address, causing threads to deadlock or hang indefinitely."], "name": "CVE-2026-99169", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99169\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99169\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-99169.mbox"], "threat_severity": "Moderate"}

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