CVE-2026-99244

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99244", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.403Z", "datePublished": "2026-11-03T11:15:14.715Z", "dateUpdated": "2026-11-03T19:13:09.510Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-03T19:13:09.510Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper\n\nSince commit 7fea700e04bd (\"zap_pid_ns_processes: clear\nTIF_NOTIFY_SIGNAL along with TIF_SIGPENDING\") zap_pid_ns_processes()\nclears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise\nkernel_wait4() doesn't sleep and returns -ERESTARTSYS if\nsignal_pending() is true and the reaper busy-waits.\n\nBut clearing TIF_NOTIFY_SIGNAL doesn't fix it. It can get raised again.\nFor example, klp_send_signals() sets it raw against any task that hasn't\ntransitioned yet. And it keeps sending it until the livepatch finishes.\n\nThe sleep loop waiting for pid_allocated to drop has the same problem\nand it doesn't even clear anything. So a schedule() in\nTASK_INTERRUPTIBLE returns immediately.\n\nUse a no_notify_signal guard. signal_pending() will ignore\nTIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child\nexits or free_pid() wakes it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/pid_namespace.c"], "versions": [{"version": "edd2754a62bee8d97b4808a15de024f66a1ddccf", "lessThan": "2c20ace1698d03a23467351be1d281e89b36ade3", "status": "affected", "versionType": "git"}, {"version": "3466abafa9f4f81a869da828e52a12f693175ec2", "lessThan": "9ab0324f4868eeb20c63f063a1e5bc01d5539212", "status": "affected", "versionType": "git"}, {"version": "7fea700e04bd3f424c2d836e98425782f97b494e", "lessThan": "30b274508c743f243c82904954c4e416d7143d4c", "status": "affected", "versionType": "git"}, {"version": "7fea700e04bd3f424c2d836e98425782f97b494e", "lessThan": 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"lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.14", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3.1", "lessThanOrEqual": "7.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.4-rc1", "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": "6.1.95", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.35", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3"}, {"url": "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212"}, {"url": "https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c"}, {"url": "https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35"}, {"url": "https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9"}, {"url": "https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59"}, {"url": "https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2"}], "title": "pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/pid_namespace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2c20ace1698d03a23467351be1d281e89b36ade3", "status": "affected", "version": "edd2754a62bee8d97b4808a15de024f66a1ddccf", "versionType": "git"}, {"lessThan": "9ab0324f4868eeb20c63f063a1e5bc01d5539212", "status": "affected", "version": "3466abafa9f4f81a869da828e52a12f693175ec2", "versionType": "git"}, {"lessThan": "30b274508c743f243c82904954c4e416d7143d4c", "status": "affected", "version": "7fea700e04bd3f424c2d836e98425782f97b494e", "versionType": "git"}, {"lessThan": "70178691c467c8f9f722765299fd8524c3121a35", "status": "affected", "version": "7fea700e04bd3f424c2d836e98425782f97b494e", "versionType": "git"}, {"lessThan": "3d15ac36ce174477efa5365e424dbd47950fd2b9", "status": "affected", "version": "7fea700e04bd3f424c2d836e98425782f97b494e", "versionType": "git"}, {"lessThan": "f46cd8241d9b83f2279cc0db3e9d3e181b548a59", "status": "affected", "version": "7fea700e04bd3f424c2d836e98425782f97b494e", "versionType": "git"}, {"lessThan": "5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2", "status": "affected", "version": "7fea700e04bd3f424c2d836e98425782f97b494e", "versionType": "git"}, {"status": "affected", "version": "82c7acf9a12c9b4e4b0aba531de82b4e39a345c8", "versionType": "git"}, {"status": "affected", "version": "8e69e589f233ca2c9631f5af2b94f95dfc2ba804", "versionType": "git"}, {"status": "affected", "version": "09ab5b424b17cfe633db58bb2f9edbaf9484cf20", "versionType": "git"}, {"lessThan": "6.1.191", "status": "affected", "version": "6.1.95", "versionType": "semver"}, {"lessThan": "6.6.161", "status": "affected", "version": "6.6.35", "versionType": "semver"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.221", "versionType": "semver"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.162", "versionType": "semver"}, {"lessThan": "6.10", "status": "affected", "version": "6.9.6", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/pid_namespace.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "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": "6.18.60", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.14", "versionType": "semver"}, {"lessThanOrEqual": "7.3.*", "status": "unaffected", "version": "7.3.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.4-rc1", "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\npid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper\n\nSince commit 7fea700e04bd (\"zap_pid_ns_processes: clear\nTIF_NOTIFY_SIGNAL along with TIF_SIGPENDING\") zap_pid_ns_processes()\nclears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise\nkernel_wait4() doesn't sleep and returns -ERESTARTSYS if\nsignal_pending() is true and the reaper busy-waits.\n\nBut clearing TIF_NOTIFY_SIGNAL doesn't fix it. It can get raised again.\nFor example, klp_send_signals() sets it raw against any task that hasn't\ntransitioned yet. And it keeps sending it until the livepatch finishes.\n\nThe sleep loop waiting for pid_allocated to drop has the same problem\nand it doesn't even clear anything. So a schedule() in\nTASK_INTERRUPTIBLE returns immediately.\n\nUse a no_notify_signal guard. signal_pending() will ignore\nTIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child\nexits or free_pid() wakes it."}], "id": "CVE-2026-99244", "lastModified": "2026-11-03T20:18:30.743", "metrics": {}, "published": "2026-11-03T12:17:30.710", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service via busy-wait loop during PID namespace cleanup", "id": "2566172", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566172"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-835", "details": ["A flaw was found in the Linux kernel's process ID (PID) namespace subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) through excessive CPU consumption. During namespace cleanup, repeated internal signal notifications can prevent the process reaper from entering a sleep state as expected, trapping it in a continuous busy-wait loop."], "name": "CVE-2026-99244", "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": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "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": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-10", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-03T11:15:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99244\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99244\nhttps://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3\nhttps://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c\nhttps://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9\nhttps://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2\nhttps://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35\nhttps://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212\nhttps://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59"], "threat_severity": "Low"}

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"value": "[7fea700e04bd3f424c2d836e98425782f97b494e,f46cd8241d9b83f2279cc0db3e9d3e181b548a59)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "82c7acf9a12c9b4e4b0aba531de82b4e39a345c8"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "8e69e589f233ca2c9631f5af2b94f95dfc2ba804"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "09ab5b424b17cfe633db58bb2f9edbaf9484cf20"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.95,6.1.191)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.35,6.6.161)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.221,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.162,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": 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