CVE-2026-89835
CVE CVE-2026-89835EUVD EUVD-2026-80435Published 2026-09-16T10:31:08.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: f2fs: avoid NULL checkpoint thread access in sysfs checkpoint_merge can be enabled even when no checkpoint merge thread is running. A read-only mount is one case: f2fs does not start f2fs_issue_ckpt there, but ckpt_thread_ioprio is still writable through sysfs. The ckpt_thread_ioprio store path updates the saved ioprio value and, when checkpoint_merge is enabled, calls set_task_ioprio() for the checkpoint thread. If cprc->f2fs_issue_ckpt is NULL, that dereferences a NULL task pointer. Protect ckpt_thread_ioprio sysfs writes with s_umount as well, so the checkpoint thread cannot disappear under the store path while updating its ioprio.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.3-rc1; e65920661708b7c0f3db45c9cd5d0095034ee37f <5cb33b00c8fbb6e8f1fa3d281c3036d5f7c7c41f; patch: 6.18.51; e65920661708b7c0f3db45c9cd5d0095034ee37f <8f3b99c50dd0da1777994ce7c7e60d39b9f60f4b; e65920661708b7c0f3db45c9cd5d0095034ee37f <aefcec3bebdeed2bff444378122300763325ba23; e65920661708b7c0f3db45c9cd5d0095034ee37f <a6573f3ffc19542de9ebc1a2b1f930fd48ba538c; patch: 7.2.5; patch: 0; patch: 6.12.110; 5.12
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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