CVE-2026-23083
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771Patch
- https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91eaPatch
- https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19Patch
- https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5Patch
- https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956Patch
- https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823Patch
- https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.