01 Record

CVE-2026-23455

netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

CriticalPUBLISHEDCNA: Linux

CNA base score9.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

View raw JSON

02 Description

netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.34% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 69.3% of scored records. A rank, not a probability.
NVD base score: 9.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-07-24.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-04-03 15:15Z5 MO AGO

Last updated

2026-08-05 12:21Z1 MO AGO

Reserved

2026-01-13

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

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

Weaknesses

CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

6c59bd255d5be0b8e3748f41fd9474f32da54aed99a36b21cc6a071ab9e9780d

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux5e35941d990123f155b02d5663e51a24f816b6f3 to < 2121f5fbe88daff0f1fc5bc47d359426c74b86b0, 5e35941d990123f155b02d5663e51a24f816b6f3 to < 65fa92f79677858b14b9e4b7275f26639afe2710, 5e35941d990123f155b02d5663e51a24f816b6f3 to < 495e97af9e7249ee02b72bb1d0848a6efc3700f4, 5e35941d990123f155b02d5663e51a24f816b6f3 to < f5e4f4e4cdb75ec36802059a94195a31f193da60, 5e35941d990123f155b02d5663e51a24f816b6f3 to < 633e8f87dad32263f6a57dccdb873f042c062111, 5e35941d990123f155b02d5663e51a24f816b6f3 to < 9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8, 5e35941d990123f155b02d5663e51a24f816b6f3 to < b652b05d51003ac074b912684f9ec7486231717b, 5e35941d990123f155b02d5663e51a24f816b6f3 to < f173d0f4c0f689173f8cdac79991043a4a89bf66, 2.6.17—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0
git.kernel.orghttps://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710
git.kernel.orghttps://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4
git.kernel.orghttps://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60
git.kernel.orghttps://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111
git.kernel.orghttps://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8
git.kernel.orghttps://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b
git.kernel.orghttps://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-019113.html

01 Record index

CVE-2026-23455

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2026-23455

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References