CVE-2026-90052

Kernel memory corruption via keyed-discard checksum overflow

Published Sep 17, 2026 · Updated Sep 18, 2026

A heap buffer overflow in dm-integrity in Linux 7.3-rc1 allows local users to corrupt kernel memory through a keyed discard operation. integrity_metadata sizes its checksums buffer by the configured tag size, but integrity_sector_checksum writes the full digest, overrunning the final allocation when the tag is shorter. Reachability requires a dm-integrity device configured for keyed discard with a tag smaller than the digest; the documented HMAC-SHA256 case writes 16 bytes past a kmalloc page.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap buffer overflow in dm-integrity in Linux 7.3-rc1 allows local users to corrupt kernel memory through a keyed discard operation. integrity_metadata sizes its checksums buffer by the configured tag size, but integrity_sector_checksum writes the full digest, overrunning the final allocation when the tag is shorter. Reachability requires a dm-integrity device configured for keyed discard with a tag smaller than the digest; the documented HMAC-SHA256 case writes 16 bytes past a kmalloc page.

The record

CVE
CVE-2026-90052
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-122, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 <9988c1c9e0d1c78391e3d8e2817beb667470c76f
  2. Affected versionversion=6228722c27304e4682cddc1fede03898f87e4414 <dd08a645195f410f2dcaa40de379a45ce110e873
  3. Affected versionversion=68c5c42567bc462139128968ebbfadd0aefff519 <59e6f919d77d72ec79cbf171256f2f7819737580
  4. Affected versionversion=7.3-rc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 <9988c1c9e0d1c78391e3d8e2817beb667470c76f; version=6228722c27304e4682cddc1fede03898f87e4414 <dd08a645195f410f2dcaa40de379a45ce110e873; version=68c5c42567bc462139128968ebbfadd0aefff519 <59e6f919d77d72ec79cbf171256f2f7819737580; version=7.3-rc1

Published CVSS scores

6.1Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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