CVE-2024-35839

Advisory lineage Upstream: 0 Downstream: 22
Analyzed
Published: 17 May 2024, 14:27
Last modified:11 May 2026, 20:12

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 May 2024, 14:27
Published
Vulnerability first disclosed
11 May 2026, 20:12
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: replace physindev with physinif in nf_bridge_info An skb can be added to a neigh->arp_queue while waiting for an arp reply. Where original skb's skb->dev can be different to neigh's neigh->dev. For instance in case of bridging dnated skb from one veth to another, the skb would be added to a neigh->arp_queue of the bridge. As skb->dev can be reset back to nf_bridge->physindev and used, and as there is no explicit mechanism that prevents this physindev from been freed under us (for instance neigh_flush_dev doesn't cleanup skbs from different device's neigh queue) we can crash on e.g. this stack: arp_process neigh_update skb = __skb_dequeue(&neigh->arp_queue) neigh_resolve_output(..., skb) ... br_nf_dev_xmit br_nf_pre_routing_finish_bridge_slow skb->dev = nf_bridge->physindev br_handle_frame_finish Let's use plain ifindex instead of net_device link. To peek into the original net_device we will use dev_get_by_index_rcu(). Thus either we get device and are safe to use it or we don't get it and drop skb.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 3%

Affected Systems

  • linux•linux

    ≥ c4e70a87d975d1f561a00abfe2d3cefa2a486c95, < 7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b | ≥ c4e70a87d975d1f561a00abfe2d3cefa2a486c95, < 9325e3188a9cf3f69fc6f32af59844bbc5b90547 | ≥ c4e70a87d975d1f561a00abfe2d3cefa2a486c95, < 544add1f1cfb78c3dfa3e6edcf4668f6be5e730c | ≥ c4e70a87d975d1f561a00abfe2d3cefa2a486c95, < 9874808878d9eed407e3977fd11fee49de1e1d86 | 4.2

  • linux•linux_kernel

    ≥ 4.2, < 6.1.75 | ≥ 6.2, < 6.6.14 | ≥ 6.7, < 6.7.2

References (4)