SB20261022123 - Integer overflow in Linux kernel packet

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Main Vulnerability Database SB20261022123

SB20261022123 - Integer overflow in Linux kernel packet

Published: October 22, 2026

Security Bulletin ID SB20261022123
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) Integer overflow (CVE-ID: CVE-2026-98547)

CWE-ID: CWE-190 - Integer overflow

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 by exhausting CPU resources.

The vulnerability exists due to integer overflow in the Linux kernel's prb_calc_retire_blk_tmo() function when calculating the block retirement timeout for TPACKET_V3 packet rings. A local user can use CAP_NET_RAW privileges to configure a packet ring with a specially crafted block size, causing a negative timeout that makes the retirement timer repeatedly fire at the maximum rate and consume CPU resources.

The demonstrated trigger requires a 1 Gbps NIC; QEMU e1000 is a working example.


Remediation

Install update from vendor's website.

References