CVE-2022-49561

netfilter: conntrack: re-fetch conntrack after insertion

MEDIUM

5.5

CVSS Score

Published: February 26, 2025 at 02:14 AM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.8%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.15 ≤ v < 4.19.2464.20 ≤ v < 5.4.1974.7 ≤ v < 4.14.2824.7 ≤ v < 4.19.2464.7 ≤ v < 5.10.1204.7 ≤ v < 5.15.454.7 ≤ v < 5.17.134.7 ≤ v < 5.18.24.7 ≤ v < 5.194.7 ≤ v < 5.4.1975.11 ≤ v < 5.15.455.16 ≤ v < 5.17.135.18 ≤ v < 5.18.25.5 ≤ v < 5.10.1204.771d8c47fc653711c41bc3282e5b0e605b3727956

Vendor states this is fixed in 01989d7eebb61c99bd4b88ebc8e261bd2f02caed (fixed)

Vendor states this is fixed in 04e4a11dc723c52db7a36dc58f0d69ce6426f8f0 (fixed)

Vendor states this is fixed in 04f9e9104c969d8ce10a4a43634f641ed082092d (fixed)

Vendor states this is fixed in 56b14ecec97f39118bf85c9ac2438c5a949509ed (fixed)

Vendor states this is fixed in 91a36ec160ec1a0c8f5352b772dffcbb0b6023e3 (fixed)

Vendor states this is fixed in 92a999d1963eed0df666284e20055136ceabd12f (fixed)

Vendor states this is fixed in b16bb373988da3ceb0308381634117e18b6ec60d (fixed)

Vendor states this is fixed in e97222b785e70e8973281666d709baad6523d8af (fixed)

Vendor states this is fixed in 4.14.282 (unaffected)

Vendor states this is fixed in 4.19.246 (unaffected)

Vendor states this is fixed in 4.7 (unaffected)

Vendor states this is fixed in 5.10.120 (unaffected)