CVE-2026-99135

Description

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix infinite loop on discard with large tag size When integrity_metadata handles a discard, it fills a buffer with DISCARD_FILLER and writes it over the tags, max_blocks blocks at a time. If the kmalloc fails, the buffer is the on-stack array checksums_onstack and max_size is set to HASH_MAX_DIGESTSIZE. So if the tag size is larger than HASH_MAX_DIGESTSIZE, max_blocks is zero, bi_size is never decremented and the loop never terminates. Fix this by using sizeof(checksums_onstack) as max_size. The array has MAX_TAG_SIZE bytes since commit b93b6643e9b5 ("dm integrity: fix a crash with unusually large tag size"), so max_blocks is at least 1.

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EPSS — Exploit Prediction

0.0019

Probability of exploitation

0.08%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/18d80c77b4c7dd20699e81cedfbbff4e9d198f28 https://git.kernel.org/stable/c/251b44b424920df9204e88a81fb3f78fa48ddd99 https://git.kernel.org/stable/c/41a18e6c6e2c4a912494a035c17ecfe79c68b9e6 https://git.kernel.org/stable/c/bbc154a7da4e075aef720ef051aff6094400eb66 https://git.kernel.org/stable/c/c4cba6670fa199415689f67108e96b0ba469d767 https://git.kernel.org/stable/c/c66f5c6ccfa832d28b44a66c01e3468c246adac4 https://git.kernel.org/stable/c/f41a224b3c9d66c7b59afc7cae02a8b214f3c684 https://git.kernel.org/stable/c/fc512700f1413fed652dac22fa1c4e837210b9c0

Frequently Asked Questions

What is CVE-2026-99135? +

In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix infinite loop on discard with large tag size When integrity_metadata handles a discard, it fills a buffer with DISCARD_FILLER and writes it over the tags, max_blocks blocks at a time. If the kmalloc fails, the buffer is the on-stack array checksums_onstack and max_size is set to HASH_MAX_DIGESTSIZE. So if the tag size is larger than HASH_MAX_DIGESTSIZE, max_blocks is zero, bi_size is never decremented and the loop never terminates. Fix this by using sizeof(checksums_onstack) as max_size. The array has MAX_TAG_SIZE bytes since commit b93b6643e9b5 ("dm integrity: fix a crash with unusually large tag size"), so max_blocks is at least 1.

How do I check if I'm vulnerable to CVE-2026-99135? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.