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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-74668 Detail

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

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7 kernel.org
https://git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b kernel.org
https://git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc kernel.org
https://git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a kernel.org
https://git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-74668
NVD Published Date:
08/22/2026
NVD Last Modified:
08/22/2026
Source:
kernel.org