CVE-2026-74701net/openvswitch: check Ethernet header length in key_extract()
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% 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: net/openvswitch: check Ethernet header length in key_extract() When a packet arrives on an ARPHRD_NONE device (e.g. TUN), ovs_flow_key_extract() trusts the user-provided skb->protocol field: if it is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and key_extract() is called without ensuring the skb has ETH_HLEN (14) bytes of linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes for MAC addresses and parse_ethertype() pulls 2 more, either of which triggers a kernel BUG in __skb_pull() when the linear area is too small. kernel BUG at include/linux/skbuff.h:2848! RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933 ovs_flow_key_extract+0x419/0xa70 ovs_vport_receive+0x222/0x390 netdev_frame_hook+0x3e0/0x630 tun_get_user+0x2d0c/0x38e0 Fixed by calling check_header() in key_extract() before accessing the Ethernet header.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 55 days later
· 55 days 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 · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < e85278afd4890dd190ba3c7a1b1a712b801c9fe1
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < 831471718f6e19aed1a330b03b53190a90e06466
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < d8bea341b183190ce6c055ab0e64ab78eb9a7290
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < 0b60b55652ba772b173dddc63f3851e1d2dd5927
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < a8139285c8925efe59af28a9169bb2fda91bff15
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699
- affected 217ac77a3c2524d999730b2a80b61fcc2d0f734a – < cf6f8b29befb92173659bcef6a441d274947bfae
- affected 4.10
- unaffected < 4.10
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.152 – ≤ 6.6.*
- unaffected 6.12.104 – ≤ 6.12.*
- unaffected 6.18.45 – ≤ 6.18.*
- unaffected 7.1.9 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1 (opens in a new tab)
- https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 (opens in a new tab)
- https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466 (opens in a new tab)
- https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290 (opens in a new tab)
- https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927 (opens in a new tab)
- https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15 (opens in a new tab)
- https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 (opens in a new tab)
- https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae (opens in a new tab)
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-2026-64388 (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-2026-74701)Record last updated .