CVE-2026-89723 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506581
- published5 Oct 2026
- disclosed11 Sept 2026
Introduced: 11 Sep 2026
NewCVE-2026-89723 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing.
Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping.
B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access.
The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted.
This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89723
- https://git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514
- https://git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9
- https://git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240
- https://git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034
- https://git.kernel.org/stable/c/39005fd1ce654ffdecacddc406b9a038efe606e6
- https://git.kernel.org/stable/c/4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d
- https://git.kernel.org/stable/c/b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf
- https://git.kernel.org/stable/c/bf49e6f6ddc12445a0330708b365de6458085980