SB20260816312 - Out-of-bounds write in Linux kernel sunrpc

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Main Vulnerability Database SB20260816312

SB20260816312 - Out-of-bounds write in Linux kernel sunrpc

Published: August 16, 2026

Security Bulletin ID SB20260816312
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-72217)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause memory corruption.

The vulnerability exists due to an out-of-bounds write in xdr_buf_to_bvec() when processing client-supplied RPC payload sizes. A remote attacker can send a specially crafted RPC request to cause memory corruption.

The out-of-bounds store can write one element past the end of the bio_vec array into adjacent slab memory, and the written length and offset fields are derived from client-controlled payload sizes.


Remediation

Install update from vendor's website.

References