Answer in brief
CVE-2026-74668 records a High severity (CVSS 7.8) vulnerability in packet: use consistent hard_header_len in TX_RING send path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <d85d2fd54e901637c81d847811e03c662aee13cd || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <016763e829cac37b3234eace86fd0a4c560de4a7 || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <27e068d1b35dbec10a3cf268887c94407be4badc || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <d48ea5c9c4c34dc0df621f0e39ed3a16b644621a || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <21b5953e7494c16a42e6cd8cf110e18d13ae4a6b | d85d2fd54e901637c81d847811e03c662aee13cd, 016763e829cac37b3234eace86fd0a4c560de4a7, 27e068d1b35dbec10a3cf268887c94407be4badc, d48ea5c9c4c34dc0df621f0e39ed3a16b644621a, 21b5953e7494c16a42e6cd8cf110e18d13ae4a6b |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
| Linux/Linuxgeneric | >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <9c7e8ff48c377bef18c3d178748aea0575b69ede || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <2a73b2c37ee3060a880b53cd24783d93fc7be5f8 || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2 || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <d85d2fd54e901637c81d847811e03c662aee13cd || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <016763e829cac37b3234eace86fd0a4c560de4a7 || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <27e068d1b35dbec10a3cf268887c94407be4badc || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <d48ea5c9c4c34dc0df621f0e39ed3a16b644621a || >=69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 <21b5953e7494c16a42e6cd8cf110e18d13ae4a6b | 9c7e8ff48c377bef18c3d178748aea0575b69ede, 2a73b2c37ee3060a880b53cd24783d93fc7be5f8, e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2, d85d2fd54e901637c81d847811e03c662aee13cd, 016763e829cac37b3234eace86fd0a4c560de4a7, 27e068d1b35dbec10a3cf268887c94407be4badc, d48ea5c9c4c34dc0df621f0e39ed3a16b644621a, 21b5953e7494c16a42e6cd8cf110e18d13ae4a6b |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.