{"id":"CVE-2026-99244","title":"pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper","summary":"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_SIGPENDI…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= edd2754a62bee8d97b4808a15de024f66a1ddccf < 2c20ace1698d03a23467351be1d281e89b36ade3","Linux >= 3466abafa9f4f81a869da828e52a12f693175ec2 < 9ab0324f4868eeb20c63f063a1e5bc01d5539212","Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 30b274508c743f243c82904954c4e416d7143d4c","Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 70178691c467c8f9f722765299fd8524c3121a35","Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 3d15ac36ce174477efa5365e424dbd47950fd2b9","Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < f46cd8241d9b83f2279cc0db3e9d3e181b548a59","Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2","Linux 82c7acf9a12c9b4e4b0aba531de82b4e39a345c8","Linux 8e69e589f233ca2c9631f5af2b94f95dfc2ba804","Linux 09ab5b424b17cfe633db58bb2f9edbaf9484cf20","Linux >= 6.1.95 < 6.1.191","Linux >= 6.6.35 < 6.6.161","Linux >= 5.10.221 < 5.11","Linux >= 5.15.162 < 5.16","Linux >= 6.9.6 < 6.10","Linux 6.10"],"published":"2026-11-03","updated":"2026-11-03","sourceUpdated":"2026-11-03T19:13:09.510Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99244","references":[{"url":"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"}],"tags":["cve.org"],"epss":0.00197,"epssPercentile":0.09466,"ingestedAt":"2026-11-05T20:33:06.392Z","slug":"CVE-2026-99244","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= edd2754a62bee8d97b4808a15de024f66a1ddccf < 2c20ace1698d03a23467351be1d281e89b36ade3`\n- `Linux >= 3466abafa9f4f81a869da828e52a12f693175ec2 < 9ab0324f4868eeb20c63f063a1e5bc01d5539212`\n- `Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 30b274508c743f243c82904954c4e416d7143d4c`\n- `Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 70178691c467c8f9f722765299fd8524c3121a35`\n- `Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 3d15ac36ce174477efa5365e424dbd47950fd2b9`\n- `Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < f46cd8241d9b83f2279cc0db3e9d3e181b548a59`\n- `Linux >= 7fea700e04bd3f424c2d836e98425782f97b494e < 5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2`\n- `Linux 82c7acf9a12c9b4e4b0aba531de82b4e39a345c8`\n- `Linux 8e69e589f233ca2c9631f5af2b94f95dfc2ba804`\n- `Linux 09ab5b424b17cfe633db58bb2f9edbaf9484cf20`\n- `Linux >= 6.1.95 < 6.1.191`\n- `Linux >= 6.6.35 < 6.6.161`\n- `Linux >= 5.10.221 < 5.11`\n- `Linux >= 5.15.162 < 5.16`\n- `Linux >= 6.9.6 < 6.10`\n- `Linux 6.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}