CVE-2026-74668 (GCVE-0-2026-74668)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-10-16 19:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.