CVE-2026-80925vlan: fix skb_under_panic and races when toggling HW VLAN offload
- —Not scoredno CVSS score yet
- 0.16%Exploitation in 30 daysEPSS · top 95% 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: vlan: fix skb_under_panic and races when toggling HW VLAN offload Toggling hardware VLAN TX offload (NETIF_F_HW_VLAN_CTAG_TX or NETIF_F_HW_VLAN_STAG_TX) on a lower device invokes vlan_transfer_features(), which dynamically changed vlandev->hard_header_len. This causes two issues: 1. Lockless TX paths (e.g. packet_snd in af_packet.c, ip6_finish_output2) read dev->hard_header_len without holding RTNL lock. Mutating hard_header_len dynamically under RTNL creates a data race where upper layers reserve insufficient headroom based on a stale hard_header_len, resulting in skb_under_panic when vlan_dev_hard_header() is called. 2. In addition, vlan_transfer_features() updated hard_header_len without updating header_ops, causing a mismatch between allocated headroom and header creation. Always setting dev->hard_header_len = real_dev->hard_header_len and dev->needed_headroom = real_dev->needed_headroom + VLAN_HLEN unconditionally ensures: - dev->hard_header_len remains 100% static and immutable at real_dev->hard_header_len, eliminating all dynamic runtime updates and data races on hard_header_len. - Upper layers allocating skbs via LL_RESERVED_SPACE() will always reserve sufficient headroom for software VLAN tag insertion (real_dev->hard_header_len + real_dev->needed_headroom + VLAN_HLEN). - vlandev inherits real_dev->needed_tailroom so underlying trailer/padding/ICV requirements are honored. - AF_PACKET SOCK_RAW network header offsets remain correctly aligned at real_dev->hard_header_len. - vlan_header_ops is used unconditionally. Note to stable teams: Make sure to backport these commits: e16e960d55a4 ("ipvlan: inherit needed_headroom and needed_tailroom from phy_dev") cef51860becd ("macvlan: inherit needed_headroom and needed_tailroom from lowerdev")
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 51 days later
· 51 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 69f2fc6e761ee68a4c0c8e416ae88c573d4d7319
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b38d7a4bc9c17e1d437696da25f9fbc286614d9d
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b30fe4de285b9bdaf9508740191f69f7cd83b8fa
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1517d1996b5236fe69eccd9d253f725e06996eb1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a29f3b884ba50217e6f50414f568073221e2bb07
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 447cbe95ebb95392b5d8f6a01c0556826919ce23
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.3 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/69f2fc6e761ee68a4c0c8e416ae88c573d4d7319 (opens in a new tab)
- https://git.kernel.org/stable/c/b38d7a4bc9c17e1d437696da25f9fbc286614d9d (opens in a new tab)
- https://git.kernel.org/stable/c/b30fe4de285b9bdaf9508740191f69f7cd83b8fa (opens in a new tab)
- https://git.kernel.org/stable/c/1517d1996b5236fe69eccd9d253f725e06996eb1 (opens in a new tab)
- https://git.kernel.org/stable/c/a29f3b884ba50217e6f50414f568073221e2bb07 (opens in a new tab)
- https://git.kernel.org/stable/c/447cbe95ebb95392b5d8f6a01c0556826919ce23 (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-2026-75102 (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-2026-80925)Record last updated .