CVE-2026-23455

critical · 9.1

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() In DecodeQ931(), the UserUserIE code path reads a 16-bit length from the packet, then decrements it by 1 to skip the protocol discriminator byte before passing it to DecodeH323_UserInformation(). If the encoded length is 0, the decrement wraps to -1, which is then passed as a large value to the decoder, leading to an out-of-bounds read. Add a check to ensure len is positive after the decrement.

9.1

CVSS

1.3%

EPSS (exploit prob.)

70th

EPSS percentile

2026-04-03

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Weaknesses

CWE-125

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 2.6.17, < 5.10.253
linux	linux_kernel	>= 5.11, < 5.15.203
linux	linux_kernel	>= 5.16, < 6.1.167
linux	linux_kernel	>= 6.2, < 6.6.130
linux	linux_kernel	>= 6.7, < 6.12.78
linux	linux_kernel	>= 6.13, < 6.18.20
linux	linux_kernel	>= 6.19, < 6.19.10
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-23455