cve-2026-99249
osv_linux
Description
In the Linux kernel, the following vulnerability has been resolved: pid_namespace: make zap_pid_ns_processes() freezable When the init of a pid namespace exits, zap_pid_ns_processes() waits until all other pids in the namespace are freed. A tracer outside the namespace that does not reap its traced zombies keeps those pids allocated, so this wait has no upper bound, and while it lasts every suspend attempt fails: Freezing user space processes failed after 20.006 seconds (2 tasks refusing to freeze, wq_busy=0): Neither wait is freezable. The first loop sleeps in do_wait(), which returns -ERESTARTSYS on the freezer's fake signal; the loop then clears TIF_SIGPENDING and waits again without ever freezing. The final loop sleeps in TASK_INTERRUPTIBLE, and since nothing clears TIF_SIGPENDING there, schedule() returns immediately after the first freeze attempt and the task spins until the wait ends. Sleep in TASK_INTERRUPTIBLE | TASK_FREEZABLE in do_wait(), so that the freezer can freeze tasks waiting there directly, and in TASK_IDLE | TASK_FREEZABLE in the final loop, like coredump_task_exit() does. This was hit with Chromium-based browsers: crashpad ptrace-attaches the threads of a crashed renderer, which is a pid namespace init, and does not reap those killed during the dump.
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/064a6761d6f6ac55d090d3eaca649577ee736713
- https://git.kernel.org/stable/c/2e10b8a74f55b5aae33db105d3e2d3ae759c865a
- https://git.kernel.org/stable/c/4b47107f1a80c809c80093e872bcaccdbae13db4
- https://git.kernel.org/stable/c/7deb5770840339fe88755bf27b92f74edc26ee87
- https://git.kernel.org/stable/c/81933038f5e273d17ed22792f906889393b204c5
- https://git.kernel.org/stable/c/e8dafad7de9ede813af2d48cc04b7c88fef16682
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99249.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-99249
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Linked Vulnerabilities
No linked vulnerabilities found.
{
"affected": [
{
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99249.json"
},
"ranges": [
{
"events": [
{
"introduced": "3eb07c8c8adb6f0572baba844ba2d9e501654316"
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{
"fixed": "064a6761d6f6ac55d090d3eaca649577ee736713"
},
{
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},
{
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{
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{
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{
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT"
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},
{
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99249.json"
},
"package": {
"ecosystem": "Linux",
"name": "Kernel"
},
"ranges": [
{
"events": [
{
"introduced": "2.6.24"
},
{
"fixed": "6.1.191"
}
],
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},
{
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},
{
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}
],
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},
{
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},
{
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}
],
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},
{
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},
{
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}
],
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},
{
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{
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},
{
"fixed": "7.2.13"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99249.json"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\npid_namespace: make zap_pid_ns_processes() freezable\n\nWhen the init of a pid namespace exits, zap_pid_ns_processes() waits\nuntil all other pids in the namespace are freed. A tracer outside the\nnamespace that does not reap its traced zombies keeps those pids\nallocated, so this wait has no upper bound, and while it lasts every\nsuspend attempt fails:\n\n Freezing user space processes failed after 20.006 seconds (2 tasks refusing to freeze, wq_busy=0):\n\nNeither wait is freezable. The first loop sleeps in do_wait(), which\nreturns -ERESTARTSYS on the freezer's fake signal; the loop then clears\nTIF_SIGPENDING and waits again without ever freezing. The final loop\nsleeps in TASK_INTERRUPTIBLE, and since nothing clears TIF_SIGPENDING\nthere, schedule() returns immediately after the first freeze attempt\nand the task spins until the wait ends.\n\nSleep in TASK_INTERRUPTIBLE | TASK_FREEZABLE in do_wait(), so that the\nfreezer can freeze tasks waiting there directly, and in TASK_IDLE |\nTASK_FREEZABLE in the final loop, like coredump_task_exit() does.\n\nThis was hit with Chromium-based browsers: crashpad ptrace-attaches the\nthreads of a crashed renderer, which is a pid namespace init, and does\nnot reap those killed during the dump.",
"id": "CVE-2026-99249",
"modified": "2026-11-05T03:31:30.298233266Z",
"published": "2026-11-03T11:18:26.800Z",
"references": [
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/064a6761d6f6ac55d090d3eaca649577ee736713"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2e10b8a74f55b5aae33db105d3e2d3ae759c865a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b47107f1a80c809c80093e872bcaccdbae13db4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7deb5770840339fe88755bf27b92f74edc26ee87"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/81933038f5e273d17ed22792f906889393b204c5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e8dafad7de9ede813af2d48cc04b7c88fef16682"
},
{
"type": "ADVISORY",
"url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99249.json"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99249"
},
{
"type": "PACKAGE",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
}
],
"schema_version": "1.9.2",
"summary": "pid_namespace: make zap_pid_ns_processes() freezable"
}