CVE-2026-23083

EUVD-2026-5459
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
linuxlinux_kernel
3.18 ≤
𝑥
< 5.10.249
linuxlinux_kernel
5.11 ≤
𝑥
< 5.15.199
linuxlinux_kernel
5.16 ≤
𝑥
< 6.1.162
linuxlinux_kernel
6.2 ≤
𝑥
< 6.6.122
linuxlinux_kernel
6.7 ≤
𝑥
< 6.12.68
linuxlinux_kernel
6.13 ≤
𝑥
< 6.18.8
linuxlinux_kernel
6.19:rc1
linuxlinux_kernel
6.19:rc2
linuxlinux_kernel
6.19:rc3
linuxlinux_kernel
6.19:rc4
linuxlinux_kernel
6.19:rc5
linuxlinux_kernel
6.19:rc6
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bookworm
vulnerable
bookworm (security)
6.1.164-1
fixed
bullseye
vulnerable
bullseye (security)
5.10.251-1
fixed
forky
6.19.10-1
fixed
sid
6.19.11-1
fixed
trixie
6.12.73-1
fixed
trixie (security)
6.12.74-2
fixed
linux-6.1
bullseye (security)
6.1.164-1~deb11u1
fixed
Vulnerability Media Exposure
References
https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771
https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea
https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19
https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5
https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956
https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823
https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03