CVE-2026-23204 (GCVE-0-2026-23204)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-08-05 12:20
VLAI
Title
net/sched: cls_u32: use skb_header_pointer_careful()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 66e4b63d61c15de6ca5332d9ca6db59a404d7136 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 29681ed51e737be14d18ecd1c304c57002e4b72c (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < cfa745830e45ecb75c061aa34330ee0cac941cc7 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < e41a23e61259f5526af875c3b86b3d42a9bae0e5 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 8a672f177ebe19c93d795fbe967846084fbc7943 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < cabd1a976375780dabab888784e356f574bbaed8 (git)
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Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.124 , ≤ 6.6.* (semver)
Unaffected: 6.12.70 , ≤ 6.12.* (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-04T13:04:33+00:00",
      "cve": "CVE-2026-23204",
      "id": "CVE-2026-23204",
      "initial_release_date": "2026-02-14T00:00:00+00:00",
      "product_status:fixed": "2719",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cls_u32: use skb_header_pointer_careful()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23204.json",
      "version": "3"
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      "current_release_date": "2026-07-28T17:20:04Z",
      "cve": "CVE-2026-23204",
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      "initial_release_date": "2026-02-16T00:25:00Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "453",
      "product_status:recommended": "880",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23204",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23204.json",
      "version": "61"
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{\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/cls_u32.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136\"}, {\"url\": \"https://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72c\"}, {\"url\": \"https://git.kernel.org/stable/c/cfa745830e45ecb75c061aa34330ee0cac941cc7\"}, {\"url\": \"https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5\"}, {\"url\": \"https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5\"}, {\"url\": \"https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943\"}, {\"url\": \"https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: cls_u32: use skb_header_pointer_careful()\\n\\nskb_header_pointer() does not fully validate negative @offset values.\\n\\nUse skb_header_pointer_careful() instead.\\n\\nGangMin Kim provided a report and a repro fooling u32_classify():\\n\\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\\nnet/sched/cls_u32.c:221\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.260\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.124\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.70\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.10\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"2.6.35\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-07-04T11:50:26.593Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23204\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:46:10.228Z\", \"dateReserved\": \"2026-01-13T15:37:45.986Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-02-14T16:27:27.708Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.