Linux Kernel dm-integrity integrity_sector_checksum buffer overflow

Summaryinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel. The impacted element is the function integrity_sector_checksum of the component dm-integrity. Executing a manipulation can lead to buffer overflow. The identification of this vulnerability is CVE-2026-90052. The attack may be launched remotely. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel (affected version not known) and classified as very critical. This vulnerability affects the function integrity_sector_checksum of the component dm-integrity. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix buffer overflow with keyed discard Since commit 68c5c42567bc ("dm-integrity: replace forgeable discard filler with a keyed sector marker"), integrity_metadata computes a checksum for every discarded block into the "checksums" buffer. integrity_sector_checksum always writes the whole digest. So if the tag size is smaller than the digest size, the checksum of the last block that fits into the buffer is written past the end of it. For example, with hmac(sha256) and tag size 16, a 4MiB discard writes 16 bytes past the kmalloc'ed page. Fix this by subtracting extra_space from the buffer size when computing max_blocks, like we do for writes.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-90052 since 09/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

Applying the patch 9988c1c9e0d1c78391e3d8e2817beb667470c76f/dd08a645195f410f2dcaa40de379a45ce110e873/59e6f919d77d72ec79cbf171256f2f7819737580 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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