CVE-2026-72107: dm era: fix out-of-bounds memory access for non-zero start sector
In the Linux kernel, the following vulnerability has been resolved:
dm era: fix out-of-bounds memory access for non-zero start sector
dm-era tracks writes in target-relative blocks, but eramap() calculates the writeset block before applying the target offset. Tables with a non-zero start sector can therefore pass an absolute mapped-device block to metadatacurrentmarked().
If the absolute block is beyond the current writeset size, writesetmarked() tests past the end of the in-core bitset. KASAN reports this as a vmalloc-out-of-bounds access.
Apply the target offset before calculating the era block so writeset lookups use the target-relative block number.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72107?
The severity of CVE-2026-72107 is rated at 34.
How do I fix CVE-2026-72107?
To fix CVE-2026-72107, update your Linux kernel to the latest version where this vulnerability has been addressed.
What type of vulnerability is CVE-2026-72107?
CVE-2026-72107 is an out-of-bounds memory access vulnerability in the Linux kernel.
What component of the Linux kernel is affected by CVE-2026-72107?
CVE-2026-72107 affects the dm era component of the Linux kernel.
When was CVE-2026-72107 published?
CVE-2026-72107 was published on August 15, 2026.