CVE-2026-90052
HighIn 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.
CVSS 3.1 score
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected versions
Linux kernel versions
7.3-rc1
and later are affected. Fixed in
7.3-rc2
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-90052?
CVE-2026-90052 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 7.3-rc1 onward and has been patched in 7.3-rc2. CVE-2026-90052 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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What is the CVSS score for CVE-2026-90052?
CVE-2026-90052 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. -
Is there a patch available for CVE-2026-90052?
Yes. CVE-2026-90052 has been patched. Fixed versions include 7.3-rc2. If you are running Linux kernel 7.3-rc1 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-90052 actively exploited?
No. CVE-2026-90052 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.