CVE-2026-23455

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23455
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 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0 Patch
https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4 Patch
https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111 Patch
https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710 Patch
https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8 Patch
https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b Patch
https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66 Patch
https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
History

26 May 2026, 14:43

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0 - () https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0 - Patch
References () https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4 - () https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4 - Patch
References () https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111 - () https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111 - Patch
References () https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710 - () https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710 - Patch
References () https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8 - () https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8 - Patch
References () https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b - () https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b - Patch
References () https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66 - () https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66 - Patch
References () https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60 - () https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60 - Patch
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
First Time Linux
Linux linux Kernel
CWE CWE-125

27 Apr 2026, 14:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.1

18 Apr 2026, 09:16

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0 -
  • () https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710 -

03 Apr 2026, 16:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-03 16:16

Updated : 2026-05-26 14:43

NVD link : CVE-2026-23455

Mitre link : CVE-2026-23455

CVE.ORG link : CVE-2026-23455

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-125

Out-of-bounds Read