CVE-2026-43233 (GCVE-0-2026-43233)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:20
VLAI
Title
netfilter: nf_conntrack_h323: fix OOB read in decode_choice()
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in decode_choice() In decode_choice(), the boundary check before get_len() uses the variable `len`, which is still 0 from its initialization at the top of the function: unsigned int type, ext, len = 0; ... if (ext || (son->attr & OPEN)) { BYTE_ALIGN(bs); if (nf_h323_error_boundary(bs, len, 0)) /* len is 0 here */ return H323_ERROR_BOUND; len = get_len(bs); /* OOB read */ When the bitstream is exactly consumed (bs->cur == bs->end), the check nf_h323_error_boundary(bs, 0, 0) evaluates to (bs->cur + 0 > bs->end), which is false. The subsequent get_len() call then dereferences *bs->cur++, reading 1 byte past the end of the buffer. If that byte has bit 7 set, get_len() reads a second byte as well. This can be triggered remotely by sending a crafted Q.931 SETUP message with a User-User Information Element containing exactly 2 bytes of PER-encoded data ({0x08, 0x00}) to port 1720 through a firewall with the nf_conntrack_h323 helper active. The decoder fully consumes the PER buffer before reaching this code path, resulting in a 1-2 byte heap-buffer-overflow read confirmed by AddressSanitizer. Fix this by checking for 2 bytes (the maximum that get_len() may read) instead of the uninitialized `len`. This matches the pattern used at every other get_len() call site in the same file, where the caller checks for 2 bytes of available data before calling get_len().
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < bcb50aa0b8f2b74a9fe5a1c7bee6f2657a288041 (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < 2a3aac4205e7d2f1aca2e3827de8cdd517d36c4a (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < 81f2fc5b0d0cf4696146f00f837596d10b92dead (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < 7ef82863d42261817a6394c6c881bd6757a70f16 (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < 53d32735d77ab56cc3fc7bd53a7d099418f19be1 (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < f0a83d0a4b7c127d32ac06d607a9214937716129 (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < 35f1943d242e1b9f0b6e91c0c93bfb293a9f8224 (git)
Affected: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa , < baed0d9ba91d4f390da12d5039128ee897253d60 (git)
Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: fix OOB read in decode_choice()\n\nIn decode_choice(), the boundary check before get_len() uses the\nvariable `len`, which is still 0 from its initialization at the top of\nthe function:\n\n    unsigned int type, ext, len = 0;\n    ...\n    if (ext || (son-\u003eattr \u0026 OPEN)) {\n        BYTE_ALIGN(bs);\n        if (nf_h323_error_boundary(bs, len, 0))  /* len is 0 here */\n            return H323_ERROR_BOUND;\n        len = get_len(bs);                        /* OOB read */\n\nWhen the bitstream is exactly consumed (bs-\u003ecur == bs-\u003eend), the check\nnf_h323_error_boundary(bs, 0, 0) evaluates to (bs-\u003ecur + 0 \u003e bs-\u003eend),\nwhich is false.  The subsequent get_len() call then dereferences\n*bs-\u003ecur++, reading 1 byte past the end of the buffer.  If that byte\nhas bit 7 set, get_len() reads a second byte as well.\n\nThis can be triggered remotely by sending a crafted Q.931 SETUP message\nwith a User-User Information Element containing exactly 2 bytes of\nPER-encoded data ({0x08, 0x00}) to port 1720 through a firewall with\nthe nf_conntrack_h323 helper active.  The decoder fully consumes the\nPER buffer before reaching this code path, resulting in a 1-2 byte\nheap-buffer-overflow read confirmed by AddressSanitizer.\n\nFix this by checking for 2 bytes (the maximum that get_len() may read)\ninstead of the uninitialized `len`.  This matches the pattern used at\nevery other get_len() call site in the same file, where the caller\nchecks for 2 bytes of available data before calling get_len()."
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:36:15+00:00",
      "cve": "CVE-2026-43233",
      "id": "CVE-2026-43233",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_conntrack_h323: fix OOB read in decode_choice()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43233.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:12:21Z",
      "cve": "CVE-2026-43233",
      "id": "CVE-2026-43233",
      "initial_release_date": "2026-05-07T02:16:58Z",
      "product_status:known_affected": "161",
      "product_status:known_not_affected": "21",
      "product_status:recommended": "138",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43233",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43233.json",
      "version": "7"
    }
  }
}



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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.