PT-2026-34354 · Linux · Linux Kernel

Published 2026-04-22 · Updated 2026-04-22 · CVE-2026-31449

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 ext correct indexes() function, which corrects index entries when the first extent in a leaf is modified. The function fails to validate that the p idx pointer falls within the valid range of index entries for the current level before accessing path[k].p idx->ei block. If the on-disk extent header contains a crafted or corrupted eh entries value, p idx can point beyond the allocated buffer, leading to a slab-out-of-bounds read (a memory access error where the system reads data outside the boundaries of a slab-allocated memory chunk).

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

Related Identifiers

CVE-2026-31449

Affected Products

Linux Kernel

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-31449 · Security Note
• https://twitter.com/CVEnew/status/2046980041930617173 · Twitter Post
• https://twitter.com/infoflowcloud/status/2046981903434006597 · Twitter Post
• https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8 · Note
• https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83 · Note
• https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1 · Note
• https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33 · Note