{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74569", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.917Z", "datePublished": "2026-08-15T12:28:09.476Z", "dateUpdated": "2026-08-15T12:28:09.476Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:28:09.476Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp()\n\nsip_help_tcp() stores the size change of each NAT-rewritten SIP message\nin s16 diff and accumulates it in s16 tdiff, but a single message can\ngrow by more than S16_MAX while the packet stays under the 65535\nenlarge_skb() limit: nf_nat_sip() rewrites every matching URI, and a long\nContact list expands the message by tens of kilobytes. diff then wraps,\nand \"datalen = datalen + diff - msglen\" yields a huge unsigned datalen,\nso the next iteration's ct_sip_get_header() reads past the linearized skb\ntail.\n\nWiden diff, tdiff and the seq_adjust hook to s32. Both are bounded by the\n65535 byte packet limit, and the seqadj core is already s32\n(nf_ct_seqadj_set() takes s32), so no previously accepted input is\nrejected.\n\n BUG: KASAN: use-after-free in ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464)\n Read of size 1 at addr ffff888010800000 by task ksoftirqd/1/25\n ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464)\n sip_help_tcp (net/netfilter/nf_conntrack_sip.c:1694)\n nf_confirm (net/netfilter/nf_conntrack_proto.c:183)\n nf_hook_slow (net/netfilter/core.c:619)\n ip6_output (net/ipv6/ip6_output.c:246)\n ip6_forward (net/ipv6/ip6_output.c:690)\n ipv6_rcv (net/ipv6/ip6_input.c:351)\n __netif_receive_skb_one_core (net/core/dev.c:6212)\n process_backlog (net/core/dev.c:6676)\n __napi_poll (net/core/dev.c:7735)\n net_rx_action (net/core/dev.c:7955)\n handle_softirqs (kernel/softirq.c:622)\n run_ksoftirqd (kernel/softirq.c:1076)\n ..."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/netfilter/nf_conntrack_sip.h", "net/netfilter/nf_conntrack_sip.c", "net/netfilter/nf_nat_sip.c"], "versions": [{"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "lessThan": "63eea41759fd682229c14e0a2205802b46d106f3", "status": "affected", "versionType": "git"}, {"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "lessThan": "c97621a110e386b2dd69e276eb699e1d3cec581d", "status": "affected", "versionType": "git"}, {"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "lessThan": "f74554e67ccf04d1fa71069e8c9afa2717e40716", "status": "affected", "versionType": "git"}, {"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "lessThan": "ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64", "status": "affected", "versionType": "git"}, {"version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "lessThan": "db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/netfilter/nf_conntrack_sip.h", "net/netfilter/nf_conntrack_sip.c", "net/netfilter/nf_nat_sip.c"], "versions": [{"version": "2.6.34", "status": "affected"}, {"version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc6", "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": "2.6.34", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.2-rc6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/63eea41759fd682229c14e0a2205802b46d106f3"}, {"url": "https://git.kernel.org/stable/c/c97621a110e386b2dd69e276eb699e1d3cec581d"}, {"url": "https://git.kernel.org/stable/c/f74554e67ccf04d1fa71069e8c9afa2717e40716"}, {"url": "https://git.kernel.org/stable/c/ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64"}, {"url": "https://git.kernel.org/stable/c/db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5"}], "title": "netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/netfilter/nf_conntrack_sip.h", "net/netfilter/nf_conntrack_sip.c", "net/netfilter/nf_nat_sip.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "63eea41759fd682229c14e0a2205802b46d106f3", "status": "affected", "version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "versionType": "git"}, {"lessThan": "c97621a110e386b2dd69e276eb699e1d3cec581d", "status": "affected", "version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "versionType": "git"}, {"lessThan": "f74554e67ccf04d1fa71069e8c9afa2717e40716", "status": "affected", "version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "versionType": "git"}, {"lessThan": "ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64", "status": "affected", "version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "versionType": "git"}, {"lessThan": "db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5", "status": "affected", "version": "f5b321bd37fbec9188feb1f721ab46a5ac0b35da", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/netfilter/nf_conntrack_sip.h", "net/netfilter/nf_conntrack_sip.c", "net/netfilter/nf_nat_sip.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.34"}, {"lessThan": "2.6.34", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc6", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp()\n\nsip_help_tcp() stores the size change of each NAT-rewritten SIP message\nin s16 diff and accumulates it in s16 tdiff, but a single message can\ngrow by more than S16_MAX while the packet stays under the 65535\nenlarge_skb() limit: nf_nat_sip() rewrites every matching URI, and a long\nContact list expands the message by tens of kilobytes. diff then wraps,\nand \"datalen = datalen + diff - msglen\" yields a huge unsigned datalen,\nso the next iteration's ct_sip_get_header() reads past the linearized skb\ntail.\n\nWiden diff, tdiff and the seq_adjust hook to s32. Both are bounded by the\n65535 byte packet limit, and the seqadj core is already s32\n(nf_ct_seqadj_set() takes s32), so no previously accepted input is\nrejected.\n\n BUG: KASAN: use-after-free in ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464)\n Read of size 1 at addr ffff888010800000 by task ksoftirqd/1/25\n ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464)\n sip_help_tcp (net/netfilter/nf_conntrack_sip.c:1694)\n nf_confirm (net/netfilter/nf_conntrack_proto.c:183)\n nf_hook_slow (net/netfilter/core.c:619)\n ip6_output (net/ipv6/ip6_output.c:246)\n ip6_forward (net/ipv6/ip6_output.c:690)\n ipv6_rcv (net/ipv6/ip6_input.c:351)\n __netif_receive_skb_one_core (net/core/dev.c:6212)\n process_backlog (net/core/dev.c:6676)\n __napi_poll (net/core/dev.c:7735)\n net_rx_action (net/core/dev.c:7955)\n handle_softirqs (kernel/softirq.c:622)\n run_ksoftirqd (kernel/softirq.c:1076)\n ..."}], "id": "CVE-2026-74569", "lastModified": "2026-08-15T13:18:02.517", "metrics": {}, "published": "2026-08-15T13:18:02.517", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63eea41759fd682229c14e0a2205802b46d106f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c97621a110e386b2dd69e276eb699e1d3cec581d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f74554e67ccf04d1fa71069e8c9afa2717e40716"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"created": "2026-08-15T15:45:06.743426+00:00", "updated": "2026-08-15T15:45:06.743432+00:00", "vendors": [], "weaknesses": ["CWE-416", "CWE-190"]}