SB20260727349 - Improper Check for Unusual or Exceptional Conditions in Linux kernel block

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-64232)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper integrity segment count handling in blk_insert_cloned_request() when processing cloned block requests with integrity metadata on stacked block-device queues. A local user can trigger a request path that uses an underestimated integrity segment count to cause a denial of service.

This can reach a BUG_ON on dispatch when the actual integrity segment count for the bottom queue exceeds the cached value inherited from the source request.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0943f81e1b3176f27dbaf6db268fc69d8a94f0ba
• https://git.kernel.org/stable/c/2c6e6a18a37b905cb584eb0dda3ae482162a81ca
• https://git.kernel.org/stable/c/42929c98d044f126508baf54a65b0f87f932fa75
• https://git.kernel.org/stable/c/53a01bcc0242590eda4c452a5bd996f62457113b