CVEvulnerability

CVE-2022-49561

5.5 MEDIUM Published 2025-02-26 Modified 2026-08-04 Official page ↗
Status
Modified
Published
2025-02-26
Last modified
2026-08-04
Assigner
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: re-fetch conntrack after insertion In case the conntrack is clashing, insertion can free skb->_nfct and set skb->_nfct to the already-confirmed entry. This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

Affected configurations

• linux linux kernel (>= 4.7 < 4.14.282) • linux linux kernel (>= 4.15 < 4.19.246) • linux linux kernel (>= 4.20 < 5.4.197) • linux linux kernel (>= 5.5 < 5.10.120) • linux linux kernel (>= 5.11 < 5.15.45) • linux linux kernel (>= 5.16 < 5.17.13) • linux linux kernel (>= 5.18 < 5.18.2)

References