SB2026060433 - Heap-based buffer overflow in Linux kernel pstore

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Main Vulnerability Database SB2026060433

SB2026060433 - Heap-based buffer overflow in Linux kernel pstore

Published: June 4, 2026

Security Bulletin ID SB2026060433
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-46253)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


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

The vulnerability exists due to a heap-based buffer overflow and an out-of-bounds read in persistent_ram_save_old() and ramoops_pstore_read() when processing persistent crash records after repeated calls for the same persistent_ram_zone. A local user can trigger a survivable crash sequence with a larger subsequent record to cause a denial of service.

Exploitation requires a prior crash record that did not fill the record size, pstore_update_ms to be enabled, and a non-fatal oops so the system continues running.


Remediation

Install update from vendor's website.

References