Description
In the Linux kernel, the following vulnerability has been resolved:
packet: use consistent hard_header_len in TX_RING send path
tpacket_snd() reads dev->hard_header_len independently for skb allocation and header construction in tpacket_fill_skb(). Concurrent netdevice reconfiguration can therefore make the reserved headroom smaller than the amount later pushed, or make copylen - hard_header_len negative.
Snapshot hard_header_len once before processing ring frames and use it for the frame limit, headroom allocation, copy length, and skb construction. Pass the snapshot to tpacket_fill_skb().
The separate SOCK_DGRAM consistency problem between hard_header_len and header_ops->create is not addressed here.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < 9c7e8ff48c377bef18c3d178748aea0575b69ede; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < 2a73b2c37ee3060a880b53cd24783d93fc7be5f8; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < d85d2fd54e901637c81d847811e03c662aee13cd; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < 016763e829cac37b3234eace86fd0a4c560de4a7; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < 27e068d1b35dbec10a3cf268887c94407be4badc; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < d48ea5c9c4c34dc0df621f0e39ed3a16b644621a; >= 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1, < 21b5953e7494c16a42e6cd8cf110e18d13ae4a6b |
| Linux | Linux | 2.6.31 |
References
- https://git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7
- https://git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b
- https://git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc
- https://git.kernel.org/stable/c/2a73b2c37ee3060a880b53cd24783d93fc7be5f8
- https://git.kernel.org/stable/c/9c7e8ff48c377bef18c3d178748aea0575b69ede
- https://git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a
- https://git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd
- https://git.kernel.org/stable/c/e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2
Timeline
- Published
- Aug 22, 2026
- Last modified
- Oct 16, 2026
- NVD status
- Received