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CVE-2026-31421

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_fw: fix NULL pointer dereference on shared blocks The old-method path in fw_classify() calls tcf_block_q() and dereferences q->handle. Shared blocks leave block->q NULL, causing a NULL deref when an empty cls_fw filter is attached to a shared block and a packet with a nonzero major skb mark is classified. Reject the configuration in fw_change() when the old method (no TCA_OPTIONS) is used on a shared block, si
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:acc676eb7f317c32c2420a8854d848604c3d41e805eb90077259244822ac1706
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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/0

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/8

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/6

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/7

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/3

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/2

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/9

{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/4

{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/cls_fw.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d6d5bd62a09650856e1e2010eb09853eba0d64e1","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"febf64ca79a2d6540ab6e5e197fa0f4f7e84473e","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"3d41f9a314afa94b1c7c7c75405920123220e8cd","status":"affected","version":"1abf272022cf1d18469405f47b4…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/affected/0

{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_fw.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","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":"6.1.168","versionType":"semver"},{"lessThanOr…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/1

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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/0
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/8
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/6
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/7
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/3
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/2
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/9
{"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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/4
{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/cls_fw.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d6d5bd62a09650856e1e2010eb09853eba0d64e1","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"febf64ca79a2d6540ab6e5e197fa0f4f7e84473e","status":"affected","version":"1abf272022cf1d18469405f47b4ec49c6a3125db","versionType":"git"},{"lessThan":"3d41f9a314afa94b1c7c7c75405920123220e8cd","status":"affected","version":"1abf272022cf1d18469405f47b4…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/affected/0
{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_fw.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.15"},{"lessThan":"4.15","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":"6.1.168","versionType":"semver"},{"lessThanOr…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/affected/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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /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:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/adp/0/references/0
{"url":"https://git.kernel.org/stable/c/18328eff2f97d1a6adcdb6d4a0f42f2f83a31e28"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/3cb055df9e8625ce699a259d8178d67b37f2b160"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/5
{"url":"https://git.kernel.org/stable/c/3d41f9a314afa94b1c7c7c75405920123220e8cd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/5cf41031922c154aa5ccda8bcdb0f5e6226582ec"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/4
{"url":"https://git.kernel.org/stable/c/96426c348def662b06bfdc65be3002905604927a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/6
{"url":"https://git.kernel.org/stable/c/d6d5bd62a09650856e1e2010eb09853eba0d64e1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/faeea8bbf6e958bf3c00cb08263109661975987c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/7
{"url":"https://git.kernel.org/stable/c/febf64ca79a2d6540ab6e5e197fa0f4f7e84473e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6333b3b007ea12bed9cd6f60bb21a53e7f334c6cf1a4527e606c9f96df045895 · sha256:b5dceb1f7154b3af… · /containers/cna/references/1

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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