CVE-2024-35839netfilter: bridge: replace physindev with physinif in nf_bridge_info
- 7.8HighCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 87% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected c4e70a87d975d1f561a00abfe2d3cefa2a486c95 – < 7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b
- affected c4e70a87d975d1f561a00abfe2d3cefa2a486c95 – < 9325e3188a9cf3f69fc6f32af59844bbc5b90547
- affected c4e70a87d975d1f561a00abfe2d3cefa2a486c95 – < 544add1f1cfb78c3dfa3e6edcf4668f6be5e730c
- affected c4e70a87d975d1f561a00abfe2d3cefa2a486c95 – < 9874808878d9eed407e3977fd11fee49de1e1d86
- affected 4.2
- unaffected < 4.2
- unaffected 6.1.75 – ≤ 6.1.*
- unaffected 6.6.14 – ≤ 6.6.*
- unaffected 6.7.2 – ≤ 6.7.*
- unaffected 6.8 – ≤ *
References
References4
- https://git.kernel.org/stable/c/7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/9325e3188a9cf3f69fc6f32af59844bbc5b90547 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/544add1f1cfb78c3dfa3e6edcf4668f6be5e730c (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/9874808878d9eed407e3977fd11fee49de1e1d86 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-35656 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-35839)Record last updated .