cve-2026-99244
osv_linux
Description
In the Linux kernel, the following vulnerability has been resolved: pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper Since commit 7fea700e04bd ("zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING") zap_pid_ns_processes() clears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise kernel_wait4() doesn't sleep and returns -ERESTARTSYS if signal_pending() is true and the reaper busy-waits. But clearing TIF_NOTIFY_SIGNAL doesn't fix it. It can get raised again. For example, klp_send_signals() sets it raw against any task that hasn't transitioned yet. And it keeps sending it until the livepatch finishes. The sleep loop waiting for pid_allocated to drop has the same problem and it doesn't even clear anything. So a schedule() in TASK_INTERRUPTIBLE returns immediately. Use a no_notify_signal guard. signal_pending() will ignore TIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child exits or free_pid() wakes it.
Timeline
- Published
- unknown
- Last Modified
- unknown
CVSS Details
CVSS details not available.
Affected Products
No product information available.
References
- https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3
- https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c
- https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9
- https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2
- https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35
- https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212
- https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99244.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-99244
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Linked Vulnerabilities
No linked vulnerabilities found.
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"details": "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",
"modified": "2026-11-05T03:31:30.003405646Z",
"published": "2026-11-03T11:15:14.715Z",
"references": [
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3"
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"url": "https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c"
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"url": "https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9"
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"url": "https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2"
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"url": "https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35"
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"url": "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212"
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"url": "https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59"
},
{
"type": "ADVISORY",
"url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99244.json"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99244"
},
{
"type": "PACKAGE",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"schema_version": "1.9.2",
"summary": "pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper"
}