CVE-2026-99249 json
pid_namespace: make zap_pid_ns_processes() freezable
published 2026-11-03 5 d ago modified 2026-11-03 5 d ago also EUVD-2026-115779
- cvss
- —
- not scored
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 5%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 6.1.191, 6.6.161, 6.12.115, 6.18.59, 7.2.13, 7.3
- linux Debian 13 6.12.115-1
- linux Debian 14 7.2.13-1
debian advisories DEBIAN-CVE-2026-99249
- linux Ubuntu 26.10 7.3.0-10.10
- linux-aws Ubuntu 26.10 7.3.0-1004.4
- linux-gcp Ubuntu 26.10 7.3.0-1004.4
- linux-raspi Ubuntu 26.10 7.3.0-1004.4
- linux-riscv Ubuntu 26.10 7.3.0-10.10.1
- linux-oracle Ubuntu 26.10 7.3.0-1004.4
- linux-realtime Ubuntu 26.10 7.3.0-10.10.1
ubuntu advisories UBUNTU-CVE-2026-99249
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel Azure Linux 3.0 6.6.161.1-1
azure linux advisories AZL-112604
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
- git.kernel.org/stable/c/064a6761d6f6ac55d090d3eaca649577ee736713 commit
- git.kernel.org/stable/c/e8dafad7de9ede813af2d48cc04b7c88fef16682 commit
- git.kernel.org/stable/c/4b47107f1a80c809c80093e872bcaccdbae13db4 commit
- git.kernel.org/stable/c/2e10b8a74f55b5aae33db105d3e2d3ae759c865a commit
- git.kernel.org/stable/c/7deb5770840339fe88755bf27b92f74edc26ee87 commit
- git.kernel.org/stable/c/81933038f5e273d17ed22792f906889393b204c5 commit
Exploit prediction
0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/064a6761d6f6ac55d090d3eaca649577ee736713
- git.kernel.org /stable/c/e8dafad7de9ede813af2d48cc04b7c88fef16682
- git.kernel.org /stable/c/4b47107f1a80c809c80093e872bcaccdbae13db4
- git.kernel.org /stable/c/2e10b8a74f55b5aae33db105d3e2d3ae759c865a
- git.kernel.org /stable/c/7deb5770840339fe88755bf27b92f74edc26ee87
- git.kernel.org /stable/c/81933038f5e273d17ed22792f906889393b204c5
Sources
- CVE List CVE-2026-99249
- NVD CVE-2026-99249
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.