Vulnerability-Lookup

GHSA-7J9W-2XG9-R3V4

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_conntrack_sip: validate skb_dst() before accessing it

tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter).

This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72253"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:52Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: validate skb_dst() before accessing it\n\ntc ingress and openvswitch do not guarantee routing information to be\navailable. These subsystems use the conntrack helper infrastructure, and\nthe SIP helper relies on the skb_dst() to be present if\nsip_external_media is set to 1 (which is disabled by default as a module\nparameter).\n\nThis effectively disables the sip_external_media toggle for these\nsubsystems without resulting in a crash.",
  "id": "GHSA-7j9w-2xg9-r3v4",
  "modified": "2026-08-23T15:33:01Z",
  "published": "2026-08-15T06:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72253"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09755dc62b026076b1d47f83489eb0547c8135e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0aec339694a56e263d4b22475ff7211d40900830"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7866116a040b3a23fb094e7d8f7ea3d61b3ac70b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b843a96252f672332837ea2ecb7c8db0acf68e20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c199ed687c00841daf60e9d131976958583a8c09"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5ef7228be04518d95591fc5369a9c554b19756d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5e24a365a5e024efef63cc49abb345fbd4852c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e64a48c50a1ff565a98c6a98d82b5b942868e76e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72253 (GCVE-0-2026-72253)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-23 12:47

Title

netfilter: nf_conntrack_sip: validate skb_dst() before accessing it

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter). This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/7866116a040b3a23f…
https://git.kernel.org/stable/c/c5ef7228be04518d9…
https://git.kernel.org/stable/c/0aec339694a56e263…
https://git.kernel.org/stable/c/e64a48c50a1ff565a…
https://git.kernel.org/stable/c/c199ed687c00841da…
https://git.kernel.org/stable/c/09755dc62b026076b…
https://git.kernel.org/stable/c/b843a96252f672332…
https://git.kernel.org/stable/c/e5e24a365a5e024ef…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < 7866116a040b3a23fb094e7d8f7ea3d61b3ac70b (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < c5ef7228be04518d95591fc5369a9c554b19756d (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < 0aec339694a56e263d4b22475ff7211d40900830 (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < e64a48c50a1ff565a98c6a98d82b5b942868e76e (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < c199ed687c00841daf60e9d131976958583a8c09 (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < 09755dc62b026076b1d47f83489eb0547c8135e0 (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < b843a96252f672332837ea2ecb7c8db0acf68e20 (git) Affected: cae3a2627520c3795b54533c5328b77af3405dbe , < e5e24a365a5e024efef63cc49abb345fbd4852c5 (git)
Linux	Linux	Affected: 4.3 Unaffected: 0 , < 4.3 (semver) Unaffected: 5.10.266 , ≤ 5.10.* (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_sip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
            {
              "lessThan": "0aec339694a56e263d4b22475ff7211d40900830",
              "status": "affected",
              "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
              "versionType": "git"
            },
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          "versions": [
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              "version": "4.3"
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              "status": "unaffected",
              "version": "0",
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            {
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              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: validate skb_dst() before accessing it\n\ntc ingress and openvswitch do not guarantee routing information to be\navailable. These subsystems use the conntrack helper infrastructure, and\nthe SIP helper relies on the skb_dst() to be present if\nsip_external_media is set to 1 (which is disabled by default as a module\nparameter).\n\nThis effectively disables the sip_external_media toggle for these\nsubsystems without resulting in a crash."
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              "value": "AV:N - Remote attackers reach set_expected_rtp_rtcp() by sending crafted SIP/SDP (e.g., INVITE) through Open vSwitch or tc ingress ct(helper=sip) on internet-facing VoIP SBC/NFV gateways where packets are conntrack-processed before skb_dst routing metadata is attached.\nAC:L - Once sip_external_media=1, sip_direct_media=0, and the SIP helper are configured on OVS/tc ingress, the attacker fully controls SIP/SDP contents to reach the skb_dst(skb)-\u003edev dereference without races or conditions outside their control.\nPR:N - Exploitation requires no privileges on the victim host; a remote SIP peer only needs to deliver malicious signaling to an already-configured OVS/tc SIP ALG with sip_external_media enabled, with no authentication or local access.\nUI:N - No victim user interaction is required; the kernel SIP helper parses attacker-supplied SIP/SDP during conntrack processing in softirq without any user action beyond normal automated packet handling.\nS:U - A NULL pointer dereference in nf_conntrack_sip causes a kernel oops/panic within the same kernel security domain on the gateway; it does not cross VM, IOMMU, or sandbox boundaries.\nC:N - The failure is a direct NULL pointer dereference from skb_dst(skb) being NULL on tc/OVS ingress paths; there is no use-after-free, out-of-bounds read, or other memory disclosure primitive.\nI:N - Accessing skb_dst(skb)-\u003edev when skb_dst is NULL cannot modify memory or hijack control flow beyond the immediate fault; CVSS guidance assigns None for pure NULL-deref crashes without write capability.\nA:H - The invalid skb_dst dereference in set_expected_rtp_rtcp() during SIP SDP processing causes a kernel oops/panic-class fault, denying availability on the VoIP gateway until reboot; the crash is reliably reproducible with crafted SIP traffic."
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        "dateUpdated": "2026-08-23T12:47:08.038Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-08-15T05:54:41.490Z",
    "dateReserved": "2026-08-09T03:40:39.915Z",
    "dateUpdated": "2026-08-23T12:47:08.038Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-7J9W-2XG9-R3V4

CVE-2026-72253 (GCVE-0-2026-72253)

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