CVE-2026-99244
Full vulnerability record from the local CVENow database.
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-11-03 12:17:30.710000
Last modified
2026-11-03 12:17:30.710000
View original CVE JSON
{
"id": "CVE-2026-99244",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-11-03T12:17:30.710",
"lastModified": "2026-11-03T12:17:30.710",
"vulnStatus": "Received",
"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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"kernel/pid_namespace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "edd2754a62bee8d97b4808a15de024f66a1ddccf",
"lessThan": "2c20ace1698d03a23467351be1d281e89b36ade3",
"versionType": "git",
"status": "affected"
},
{
"version": "3466abafa9f4f81a869da828e52a12f693175ec2",
"lessThan": "9ab0324f4868eeb20c63f063a1e5bc01d5539212",
"versionType": "git",
"status": "affected"
},
{
"version": "7fea700e04bd3f424c2d836e98425782f97b494e",
"lessThan": "30b274508c743f243c82904954c4e416d7143d4c",
"versionType": "git",
"status": "affected"
},
{
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"versionType": "git",
"status": "affected"
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{
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"lessThan": "f46cd8241d9b83f2279cc0db3e9d3e181b548a59",
"versionType": "git",
"status": "affected"
},
{
"version": "82c7acf9a12c9b4e4b0aba531de82b4e39a345c8",
"versionType": "git",
"status": "affected"
},
{
"version": "8e69e589f233ca2c9631f5af2b94f95dfc2ba804",
"versionType": "git",
"status": "affected"
},
{
"version": "09ab5b424b17cfe633db58bb2f9edbaf9484cf20",
"versionType": "git",
"status": "affected"
},
{
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"versionType": "semver",
"status": "affected"
},
{
"version": "6.6.35",
"lessThan": "6.6.161",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.10.221",
"lessThan": "5.11",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.15.162",
"lessThan": "5.16",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.9.6",
"lessThan": "6.10",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"kernel/pid_namespace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.10",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.10",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.161",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.115",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.60",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.14",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3.1",
"lessThanOrEqual": "7.3.*",
"versionType": "semver",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"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"
},
{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}