CVE-2026-74668

CVE CVE-2026-74668EUVD EUVD-2026-64355Published 2026-08-22T15:32:39.000ZLast changed 2026-08-27T12:40:01.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.6.152; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <d48ea5c9c4c34dc0df621f0e39ed3a16b644621a; patch: 6.1.185; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <016763e829cac37b3234eace86fd0a4c560de4a7; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <21b5953e7494c16a42e6cd8cf110e18d13ae4a6b; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <d85d2fd54e901637c81d847811e03c662aee13cd; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2; patch: 5.10.267; 2.6.31; patch: 7.1.9; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <9c7e8ff48c377bef18c3d178748aea0575b69ede; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <27e068d1b35dbec10a3cf268887c94407be4badc; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <2a73b2c37ee3060a880b53cd24783d93fc7be5f8; patch: 6.12.104; patch: 6.18.45; patch: 5.15.218; patch: 0; patch: 7.2

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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