Answer in brief
CVE-2026-74665 records a Unknown severity vulnerability in net: fix skb length accounting after generic XDP frag adjustment. The current sources do not mark it as known exploited. The current feed maps 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.
A CVSS score is not reported in the current record. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <72468efcc089782fa047afddd10856b11a14ef5b || >=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <5f30f9c302cea1f2ebf97abe574c1826544223d7 || >=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <ea1ccd6d1c6370868e3b032a3fc575b9c397f2e1 || >=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <33f2b2eb33d666ecac68031e0f31424fb70528db | 72468efcc089782fa047afddd10856b11a14ef5b, 5f30f9c302cea1f2ebf97abe574c1826544223d7, ea1ccd6d1c6370868e3b032a3fc575b9c397f2e1, 33f2b2eb33d666ecac68031e0f31424fb70528db |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 22, 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: net: fix skb length accounting after generic XDP frag adjustment Generic XDP exposes non-linear skb fragments through an xdp_buff. If an XDP program adjusts the fragment area, bpf_prog_run_generic_xdp() copies xdp_frags_size back to skb->data_len but leaves skb->len containing the old fragment contribution. After a fragment shrink, this makes skb_headlen() larger than the actual linear area. In the reproduced UDP receive path, __skb_datagram_iter() copied 1024 bytes past the actual linear tail to userspace, starting at struct skb_shared_info. The copied bytes included the affected skb's nr_frags, xdp_frags_size and a kernel pointer from skb_shinfo(skb)->frags[0]. Real packet data was displaced by the same amount and truncated at the end. Subtract the old data_len before replacing it and add the new data_len afterwards, keeping skb->len and skb->data_len synchronized. A 60000-byte UDP datagram on a veth pair with MTU 64000 was shortened by 1024 bytes from its fragment area. Before the fix, all 10 runs produced corrupted payloads. After the fix, all 10 runs matched the expected payload exactly.
Quoted source text, attributed separately from HOL analysis.