CVE-2026-89835f2fs: avoid NULL checkpoint thread access in sysfs
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 44 days later
· 44 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected e65920661708b7c0f3db45c9cd5d0095034ee37f – < 54196bcfde998fb37009f50e0ef16498f651f0f9
- affected e65920661708b7c0f3db45c9cd5d0095034ee37f – < 22760e3e9cecbddc475edc91600787abf407a302
- affected e65920661708b7c0f3db45c9cd5d0095034ee37f – < a6573f3ffc19542de9ebc1a2b1f930fd48ba538c
- affected e65920661708b7c0f3db45c9cd5d0095034ee37f – < aefcec3bebdeed2bff444378122300763325ba23
- affected e65920661708b7c0f3db45c9cd5d0095034ee37f – < 8f3b99c50dd0da1777994ce7c7e60d39b9f60f4b
- affected e65920661708b7c0f3db45c9cd5d0095034ee37f – < 5cb33b00c8fbb6e8f1fa3d281c3036d5f7c7c41f
- affected 5.12
- unaffected < 5.12
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.5 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/54196bcfde998fb37009f50e0ef16498f651f0f9 (opens in a new tab)
- https://git.kernel.org/stable/c/22760e3e9cecbddc475edc91600787abf407a302 (opens in a new tab)
- https://git.kernel.org/stable/c/a6573f3ffc19542de9ebc1a2b1f930fd48ba538c (opens in a new tab)
- https://git.kernel.org/stable/c/aefcec3bebdeed2bff444378122300763325ba23 (opens in a new tab)
- https://git.kernel.org/stable/c/8f3b99c50dd0da1777994ce7c7e60d39b9f60f4b (opens in a new tab)
- https://git.kernel.org/stable/c/5cb33b00c8fbb6e8f1fa3d281c3036d5f7c7c41f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-80435 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89835)Record last updated .