VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-90333: Linux kernel · dm-integrity: replace forgeable discard filler with a keyed sector marker

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 6228722c27304e4682cddc1fede03898f87e4414 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6228722c27304e4682cddc1fede03898f87e4414, 388c3f6496bb8083576d989e6d249ba9807c6b0b, 68c5c42567bc462139128968ebbfadd0aefff519 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to 6228722c27304e4682cddc1fede03898f87e4414, 388c3f6496bb8083576d989e6d249ba9807c6b0b, 68c5c42567bc462139128968ebbfadd0aefff519 or 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 84597a44a9d86ac949900441cea7da0af0f2f473, < 6228722c27304e4682cddc1fede03898f87e4414	Fixed in 6228722c27304e4682cddc1fede03898f87e4414
LinuxLinux	Affected ≥ 84597a44a9d86ac949900441cea7da0af0f2f473, < 388c3f6496bb8083576d989e6d249ba9807c6b0b	Fixed in 388c3f6496bb8083576d989e6d249ba9807c6b0b
LinuxLinux	Affected ≥ 84597a44a9d86ac949900441cea7da0af0f2f473, < 68c5c42567bc462139128968ebbfadd0aefff519	Fixed in 68c5c42567bc462139128968ebbfadd0aefff519
LinuxLinux	Affected ≥ 84597a44a9d86ac949900441cea7da0af0f2f473, < 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775	Fixed in 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775
LinuxLinux	Affected =5.7	Fixed in–

Description

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().

References

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