{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72253", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.915Z", "datePublished": "2026-08-15T05:54:41.490Z", "dateUpdated": "2026-08-23T12:47:08.038Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:47:08.038Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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)->dev 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)->dev 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_conntrack_sip.c" ], "versions": [ { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "7866116a040b3a23fb094e7d8f7ea3d61b3ac70b", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "c5ef7228be04518d95591fc5369a9c554b19756d", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "0aec339694a56e263d4b22475ff7211d40900830", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "e64a48c50a1ff565a98c6a98d82b5b942868e76e", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "c199ed687c00841daf60e9d131976958583a8c09", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "09755dc62b026076b1d47f83489eb0547c8135e0", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "b843a96252f672332837ea2ecb7c8db0acf68e20", "status": "affected", "versionType": "git" }, { "version": "cae3a2627520c3795b54533c5328b77af3405dbe", "lessThan": "e5e24a365a5e024efef63cc49abb345fbd4852c5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_conntrack_sip.c" ], "versions": [ { "version": "4.3", "status": "affected" }, { "version": "0", "lessThan": "4.3", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7866116a040b3a23fb094e7d8f7ea3d61b3ac70b" }, { "url": "https://git.kernel.org/stable/c/c5ef7228be04518d95591fc5369a9c554b19756d" }, { "url": "https://git.kernel.org/stable/c/0aec339694a56e263d4b22475ff7211d40900830" }, { "url": "https://git.kernel.org/stable/c/e64a48c50a1ff565a98c6a98d82b5b942868e76e" }, { "url": "https://git.kernel.org/stable/c/c199ed687c00841daf60e9d131976958583a8c09" }, { "url": "https://git.kernel.org/stable/c/09755dc62b026076b1d47f83489eb0547c8135e0" }, { "url": "https://git.kernel.org/stable/c/b843a96252f672332837ea2ecb7c8db0acf68e20" }, { "url": "https://git.kernel.org/stable/c/e5e24a365a5e024efef63cc49abb345fbd4852c5" } ], "title": "netfilter: nf_conntrack_sip: validate skb_dst() before accessing it", "x_generator": { "engine": "bippy-1.2.0" } } } }