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netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98077

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98077

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "9ae0a87e6f513293677fe286729fbae34d592215",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "b6277622b7323000895b674321c9a1f060553188",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "c6beb08b1a9fdb96795816d8329ed75dd785d48e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "4be8380e3af008f418f97992c06f23be649a430d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "4a30aa2ba007db18210dd52219ecbd5528c03523",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea45f12a2766dae54e5426a23e8f4bafdbe2782e",
        "lessThan": "e8f8231824b5815f57ce62cba116e511b10196de",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_sip.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.26"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.26",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_conntrack_sip.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98077

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38186 · Revision 1
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Publisher date
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