netfilter: nf_conntrack_h323: check for zero length in DecodeQ931()
Summary
| CVE | CVE-2026-23455 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-03 16:16:32 UTC |
| Updated | 2026-04-18 09:16:28 UTC |
| 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. |
Risk And Classification
EPSS: 0.000320000 probability, percentile 0.090980000 (date 2026-04-18)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 2121f5fbe88daff0f1fc5bc47d359426c74b86b0 git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 65fa92f79677858b14b9e4b7275f26639afe2710 git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 495e97af9e7249ee02b72bb1d0848a6efc3700f4 git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 f5e4f4e4cdb75ec36802059a94195a31f193da60 git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 633e8f87dad32263f6a57dccdb873f042c062111 git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8 git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 b652b05d51003ac074b912684f9ec7486231717b git | Not specified |
| CNA | Linux | Linux | affected 5e35941d990123f155b02d5663e51a24f816b6f3 f173d0f4c0f689173f8cdac79991043a4a89bf66 git | Not specified |
| CNA | Linux | Linux | affected 2.6.17 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.17 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.20 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.10 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.