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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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6cae72118910c17dddf17bd27ee00527a5838cff4d106f73d37b3320359f17ca
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 12 assertions

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/0

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/6

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/2

{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_h323_asn1.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.17"},{"lessThan":"2.6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/affected/1

{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/9

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/1

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/7

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/4

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/5

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/3

{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/8

{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_h323_asn1.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2121f5fbe88daff0f1fc5bc47d359426c74b86b0","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"65fa92f79677858b14b9e4b7275f26639afe2710","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"495e97af9e7249ee02b72bb1d0848a6efc3700f4","status":"affected","version":"5e35941…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/affected/0

Affected products and versions

12 source assertions
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/0
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/6
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/2
{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_h323_asn1.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.17"},{"lessThan":"2.6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/affected/1
{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/9
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/1
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/7
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/4
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/5
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/3
{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/affected/8
{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_h323_asn1.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2121f5fbe88daff0f1fc5bc47d359426c74b86b0","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"65fa92f79677858b14b9e4b7275f26639afe2710","status":"affected","version":"5e35941d990123f155b02d5663e51a24f816b6f3","versionType":"git"},{"lessThan":"495e97af9e7249ee02b72bb1d0848a6efc3700f4","status":"affected","version":"5e35941…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/metrics/0/cvssV3_1

Source references

10 source assertions
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/references/1
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/adp/0/references/0
{"url":"https://git.kernel.org/stable/c/2121f5fbe88daff0f1fc5bc47d359426c74b86b0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/495e97af9e7249ee02b72bb1d0848a6efc3700f4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/633e8f87dad32263f6a57dccdb873f042c062111"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/65fa92f79677858b14b9e4b7275f26639afe2710"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/9d00fe7d6d7c5b5f1065a6e042b54f2e44bd6df8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/b652b05d51003ac074b912684f9ec7486231717b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/f173d0f4c0f689173f8cdac79991043a4a89bf66"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/7
{"url":"https://git.kernel.org/stable/c/f5e4f4e4cdb75ec36802059a94195a31f193da60"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b9fc82c3f7c221f47bff1a05cea922e87b9bd591ca602ad6108ab7da02f385d7 · sha256:072476100870fa48… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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