CVE-2026-90333
In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum().
Affected versions
Linux kernel versions
5.7
and later are affected. Fixed in
6.18.52,
7.2.6,
7.3-rc1
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-90333?
CVE-2026-90333 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.7 onward and has been patched in 6.18.52, 7.2.6 and 7.3-rc1. CVE-2026-90333 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-90333?
Yes. CVE-2026-90333 has been patched. Fixed versions include 6.18.52, 7.2.6 and 7.3-rc1. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-90333 actively exploited?
No. CVE-2026-90333 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.