CVE-2026-45861
What it is
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix slab-use-after-free in qd_put Commit a475c5dd16e5 ("gfs2: Free quota data objects synchronously") started freeing quota data objects during filesystem shutdown instead of putting them back onto the LRU list, but it failed to remove these objects from the LRU list, causing LRU list corruption. This caused use-after-free when the shrinker (gfs2_qd_shrink_scan) tried to access already-freed objects on the LRU list. Fix this by removing qd objects from the LRU list before freeing them in qd_put(). Initial fix from Deepanshu Kartikey <[email protected]>.
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 0.2% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.2% in the next 30 days (EPSS).
- Severity: 7.8 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.2% · EPSS, next 30 days
- Weakness
- CWE-416 · Use after free
- Record status
- Modified
Affected
- Linux Kernel < 6.12.75
- Linux Kernel < 6.18.14
- Linux Kernel < 6.19.4
Attack profile CVSS 3.1 · 7.8
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-45861.md and follow it. Check whether this project is affected by CVE-2026-45861. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://git.kernel.org/stable/c/1d47922b98046b8070a77347fb883a6523792803
- https://git.kernel.org/stable/c/22150a7d401d9e9169b9b68e05bed95f7f49bf69
- https://git.kernel.org/stable/c/80fff26d7a0c3926b511661c27eecc811a420eef
- https://git.kernel.org/stable/c/ca7c67bdd293089b3483f18886d6b2d0037d2ad9
References
- https://git.kernel.org/stable/c/1d47922b98046b8070a77347fb883a6523792803
- https://git.kernel.org/stable/c/22150a7d401d9e9169b9b68e05bed95f7f49bf69
- https://git.kernel.org/stable/c/53aaf083de197946b25bc4ffa3068d37366ce73d
- https://git.kernel.org/stable/c/80fff26d7a0c3926b511661c27eecc811a420eef
- https://git.kernel.org/stable/c/ca7c67bdd293089b3483f18886d6b2d0037d2ad9