SECUFOCUSNOW
Home›CVE index›CVE-2024-27018
Review reviewHigh

CVE-2024-27018

Linux Linux, linux kernel, fedora

In the Linux kernel, the following vulnerability has been resolved: netfilter: br_netfilter: skip conntrack input hook for promisc packets For historical reasons, when bridge device is in promisc mode, packets that are directed to the taps follow bridge input hook path. This patch adds a workaround to reset conntrack for these packets. Jianbo Liu reports warning splats in their test infrastructure where cloned packets reach the br_netfilter input hook to confirm the conntrack object. Scratch one bit from BR_INPUT_SKB_CB to annotate that this packet has reached the input hook because it is p...

CVSS
7.8
EPSS
0.63%
46.9% percentile
CISA KEV
Not listed
Published
2024.05.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.63%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: br_netfilter: skip conntrack input hook for promisc packets For historical reasons, when bridge device is in promisc mode, packets that are directed to the taps follow bridge input hook path. This patch adds a workaround to reset conntrack for these packets. Jianbo Liu reports warning splats in their test infrastructure where cloned packets reach the br_netfilter input hook to confirm the conntrack object. Scratch one bit from BR_INPUT_SKB_CB to annotate that this packet has reached the input hook because it is p...

Affected product and versions

Product
Linux Linux, linux kernel, fedora
Affected versions
>= 7c3f28599652acf431a2211168de4a583f30b6d5 < dceb683ab87ca3666a9bb5c0158528b646faedc4, >= 2b1414d5e94e477edff1d2c79030f1d742625ea0 < b13db0d16bc7b2a52abcf5cb71334f63faa5dbd6, >= 80cd0487f630b5382734997c3e5e3003a77db315 < 3f59ac29dea0921637053908fe99268d157bbb9d, >= 62e7151ae3eb465e0ab52a20c941ff33bb6332e9 < 43193174510ea4f3ce09b796e559a2fd9f148615, >= 62e7151ae3eb465e0ab52a20c941ff33bb6332e9 < 751de2012eafa4d46d8081056761fa0e9cc8a178, >= cb734975b0ffa688ff6cc0eed463865bf07b6c01, >= 5.15.151 < 5.15.157, >= 6.1.81 < 6.1.88, >= 6.6.21 < 6.6.29, >= 6.7.9 < 6.8, >= 6.8, >= 6.7.9 < 6.8.8, 6.9, 38, 39, 40
Fixed versions
5.15.157, 6.1.88, 6.6.29, 6.8.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, fedora and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available