CVE-2026-23083CWE-20

CVE-2026-23083

High · published February 4, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
4.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00154 · 4.2th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-02-04T22:16Z
Affected products (12)
ProductVersionsFixed in
linux/linux_kernel≥ 3.18, < 5.10.2495.10.249
linux/linux_kernel≥ 5.11, < 5.15.1995.15.199
linux/linux_kernel≥ 5.16, < 6.1.1626.1.162
linux/linux_kernel≥ 6.2, < 6.6.1226.6.122
linux/linux_kernel≥ 6.7, < 6.12.686.12.68
linux/linux_kernel≥ 6.13, < 6.18.86.18.8
linux/linux_kernelall versions—
linux/linux_kernelall versions—
linux/linux_kernelall versions—
linux/linux_kernelall versions—
linux/linux_kernelall versions—
linux/linux_kernelall versions—
References (9)
https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://cert-portal.siemens.com/productcert/html/ssa-019113.html · 0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-457936.html · 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
EPSS history
Timeline
  • 04 FEB 16:08Z
    fou: Don't allow 0 for FOU_ATTR_IPPROTO.
    cvelistv5