{"id":"CVE-2026-99249","published":"2026-11-03T12:17:31.460","lastModified":"2026-11-03T12:17:31.460","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/064a6761d6f6ac55d090d3eaca649577ee736713","tags":[]},{"url":"https://git.kernel.org/stable/c/2e10b8a74f55b5aae33db105d3e2d3ae759c865a","tags":[]},{"url":"https://git.kernel.org/stable/c/4b47107f1a80c809c80093e872bcaccdbae13db4","tags":[]},{"url":"https://git.kernel.org/stable/c/7deb5770840339fe88755bf27b92f74edc26ee87","tags":[]},{"url":"https://git.kernel.org/stable/c/81933038f5e273d17ed22792f906889393b204c5","tags":[]},{"url":"https://git.kernel.org/stable/c/e8dafad7de9ede813af2d48cc04b7c88fef16682","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}