CVE-2026-23455
Analyzed
Analyzed - Analysis Complete
Out-of-Bounds Read in Linux Kernel netfilter nf_conntrack_h
Publication date: 2026-04-03
Last updated on: 2026-05-26
Assigner: kernel.org
Description
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | From 6.2 (inc) to 6.6.130 (exc) |
| linux | linux_kernel | From 5.11 (inc) to 5.15.203 (exc) |
| linux | linux_kernel | From 5.16 (inc) to 6.1.167 (exc) |
| linux | linux_kernel | From 6.7 (inc) to 6.12.78 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.18.20 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 6.19.10 (exc) |
| linux | linux_kernel | From 2.6.17 (inc) to 5.10.253 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
