CVE-2026-45843 (GCVE-0-2026-45843)

Vulnerability from cvelistv5 – Published: 2026-05-27 09:24 – Updated: 2026-08-05 12:28
VLAI
Title
slip: bound decode() reads against the compressed packet length
Summary
In the Linux kernel, the following vulnerability has been resolved: slip: bound decode() reads against the compressed packet length slhc_uncompress() parses a VJ-compressed TCP header by advancing a pointer through the packet via decode() and pull16(). Neither helper bounds-checks against isize, and decode() masks its return with & 0xffff so it can never return the -1 that callers test for -- those error paths are dead code. A short compressed frame whose change byte requests optional fields lets decode() read past the end of the packet. The over-read bytes are folded into the cached cstate and reflected into subsequent reconstructed packets. Make decode() and pull16() take the packet end pointer and return -1 when exhausted. Add a bounds check before the TCP-checksum read. The existing == -1 tests now do what they were always meant to.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6268f01ae989013671b526c883e92655342c6f6f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9aafba2f49e1fcccc2018816f5836a609c925879 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 335957df4ed60f02a2ec0432fbedbf0cc7241d8b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 37537e42e6df387398bee85cb85070cc80bb1e10 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4cefe32639933d652614b0bd50f818f9af4af78f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d42bec6e4f6d6d658be365539400b3314b76b2a7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslip: bound decode() reads against the compressed packet length\n\nslhc_uncompress() parses a VJ-compressed TCP header by advancing a\npointer through the packet via decode() and pull16(). Neither helper\nbounds-checks against isize, and decode() masks its return with\n\u0026 0xffff so it can never return the -1 that callers test for -- those\nerror paths are dead code.\n\nA short compressed frame whose change byte requests optional fields\nlets decode() read past the end of the packet. The over-read bytes\nare folded into the cached cstate and reflected into subsequent\nreconstructed packets.\n\nMake decode() and pull16() take the packet end pointer and return -1\nwhen exhausted. Add a bounds check before the TCP-checksum read.\nThe existing == -1 tests now do what they were always meant to."
          }
        ],
        "id": "CVE-2026-45843",
        "lastModified": "2026-06-26T18:49:23.103",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 4.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-05-27T11:16:23.743",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0511ecb00e61bf28e2fec4bb41fcce385c3a3b2d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/335957df4ed60f02a2ec0432fbedbf0cc7241d8b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/37537e42e6df387398bee85cb85070cc80bb1e10"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4c1367a2d7aad643a6f87c6931b13cc1a25e8ca7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4cefe32639933d652614b0bd50f818f9af4af78f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6268f01ae989013671b526c883e92655342c6f6f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9aafba2f49e1fcccc2018816f5836a609c925879"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d42bec6e4f6d6d658be365539400b3314b76b2a7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T21:30:46+00:00",
      "cve": "CVE-2026-45843",
      "id": "CVE-2026-45843",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: slip: bound decode() reads against the compressed packet length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45843.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T23:35:11Z",
      "cve": "CVE-2026-45843",
      "id": "CVE-2026-45843",
      "initial_release_date": "2026-05-27T12:57:22Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "643",
      "product_status:recommended": "320",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45843",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45843.json",
      "version": "20"
    }
  }
}



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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

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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.