PT-2026-43779 · Linux · Linux Kernel

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-45912

Positive Technologies (AI Summary)

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the ext4 file system where caching extents during the splitting process can lead to stale extents remaining in the status tree. Specifically, when ext4 split extent at() splits an extent, it truncates the existing one and inserts a new one. During this process, calls to ext4 find extent() and ext4 cache extents() may incorrectly insert the truncated range as a hole into the extent status tree. This hole is not subsequently replaced with the correct status, which can cause errors in space accounting if a delayed buffer write is performed on that range. Additionally, if the unwritten extent cache is not shrunk during splitting, ext4 cache extents() may conflict with existing extents.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-45912

Affected Products

Linux Kernel

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-45912 · Security Note
• https://git.kernel.org/stable/c/5b1f4290453314e11cd8e15c7baa8a9b76c19b23 · Note
• https://git.kernel.org/stable/c/93b2ebbbcb2e63cfc21a1946dfe91d3aa7952036 · Note
• https://git.kernel.org/stable/c/4c2d9dac4d328244f9365b0a1fa27ec802821820 · Note
• https://git.kernel.org/stable/c/9a2b95cdaf07785e2739199037bd9c0863ccc1be · Note
• https://git.kernel.org/stable/c/96007fd3c106aea773c1afae2d6f64cceb6da208 · Note
• https://git.kernel.org/stable/c/8b4b19a2f96348d70bfa306ef7d4a13b0bcbea79 · Note
• https://git.kernel.org/stable/c/8302b5b4aacdbb378f7b1216bb2ee782b5142415 · Note
• https://git.kernel.org/stable/c/692103feca376ae4298c92aa8828015d20f1d87b · Note
• https://twitter.com/vuldb/status/2059650895433072759 · Twitter Post