CVE-2026-23397 addresses a vulnerability in the Linux kernel's nfnetlink_osf module concerning insufficient validation of TCP option lengths within fingerprints. Specially crafted network packets containing zero-length TCP options or malformed MSS options can trigger a null-pointer dereference or out-of-bounds reads during packet matching. This flaw primarily leads to a kernel crash, resulting in a Denial of Service. The vulnerability has a low FAUCET Risk Score of 20.0/100 and an extremely low EPSS score of 0.00024%. There is no indication of active exploitation, public exploit code availability, or significant community attention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.6.31.1, < 5.10.253CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 5.11, < 5.15.203CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 5.16, < 6.1.167CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.2, < 6.6.130CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.7, < 6.12.78CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
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