CVE-2026-98077 (GCVE-0-2026-98077)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:24 – Updated: 2026-09-25 10:24
VLAI
Title
netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace() sip_skip_whitespace() returns dptr unchanged when its own loop exhausts the buffer (dptr == limit), instead of NULL like its sibling sip_follow_continuation() returns on its own "no more data" path. ct_sip_get_header() only checks for NULL after calling it: dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; if (*dptr != ':' || ++dptr >= limit) break; so a recognized header name followed only by spaces/tabs running to the exact end of the SIP payload, with no colon, makes the very next statement read one byte past the buffer. Make both "no more data" outcomes return NULL, matching the convention sip_follow_continuation() already uses and that both existing callers already check for.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ea45f12a2766dae54e5426a23e8f4bafdbe2782e , < 60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94 (git)
Affected: ea45f12a2766dae54e5426a23e8f4bafdbe2782e , < 4be8380e3af008f418f97992c06f23be649a430d (git)
Affected: ea45f12a2766dae54e5426a23e8f4bafdbe2782e , < 4a30aa2ba007db18210dd52219ecbd5528c03523 (git)
Affected: ea45f12a2766dae54e5426a23e8f4bafdbe2782e , < e8f8231824b5815f57ce62cba116e511b10196de (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_sip.c"
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              "negate": false,
              "operator": "OR"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()\n\nsip_skip_whitespace() returns dptr unchanged when its own loop\nexhausts the buffer (dptr == limit), instead of NULL like its sibling\nsip_follow_continuation() returns on its own \"no more data\" path.\n\nct_sip_get_header() only checks for NULL after calling it:\n\n  dptr = sip_skip_whitespace(dptr, limit);\n  if (dptr == NULL)\n          break;\n  if (*dptr != \u0027:\u0027 || ++dptr \u003e= limit)\n          break;\n\nso a recognized header name followed only by spaces/tabs running to\nthe exact end of the SIP payload, with no colon, makes the very next\nstatement read one byte past the buffer.\n\nMake both \"no more data\" outcomes return NULL, matching the\nconvention sip_follow_continuation() already uses and that both\nexisting callers already check for."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:24:15.691Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/4be8380e3af008f418f97992c06f23be649a430d"
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          "url": "https://git.kernel.org/stable/c/e8f8231824b5815f57ce62cba116e511b10196de"
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      "title": "netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98077",
    "datePublished": "2026-09-25T10:24:15.691Z",
    "dateReserved": "2026-09-25T10:19:56.074Z",
    "dateUpdated": "2026-09-25T10:24:15.691Z",
    "state": "PUBLISHED"
  },
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()\n\nsip_skip_whitespace() returns dptr unchanged when its own loop\nexhausts the buffer (dptr == limit), instead of NULL like its sibling\nsip_follow_continuation() returns on its own \"no more data\" path.\n\nct_sip_get_header() only checks for NULL after calling it:\n\n  dptr = sip_skip_whitespace(dptr, limit);\n  if (dptr == NULL)\n          break;\n  if (*dptr != \u0027:\u0027 || ++dptr \u003e= limit)\n          break;\n\nso a recognized header name followed only by spaces/tabs running to\nthe exact end of the SIP payload, with no colon, makes the very next\nstatement read one byte past the buffer.\n\nMake both \"no more data\" outcomes return NULL, matching the\nconvention sip_follow_continuation() already uses and that both\nexisting callers already check for."
          }
        ],
        "id": "CVE-2026-98077",
        "lastModified": "2026-09-25T11:17:37.090",
        "metrics": {},
        "published": "2026-09-25T11:17:37.090",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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.

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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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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.