In the Linux kernel, the following vulnerability has been resolved: packet: use consistent hard_header_len in TX_RING send path tpacket…
CVE-2026-74668 · published 22 Aug 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74668?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 2.6.31
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7
- git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b
- git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc
- git.kernel.org/stable/c/2a73b2c37ee3060a880b53cd24783d93fc7be5f8
- git.kernel.org/stable/c/9c7e8ff48c377bef18c3d178748aea0575b69ede
- git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a
- git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd
- git.kernel.org/stable/c/e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON