CVE-2025-38192

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We enter ip6_rcv_core which\ntries to use skb_dst(). But the dst is still an IPv4 one left\nafter IPv4 mcast output.\n\nClear the dst in all BPF helpers which change the protocol.\nTry to preserve metadata dsts, those may carry non-routing\nmetadata."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The stale dst only survives to the ingress BPF hook on locally generated traffic (loopback_xmit's skb_dst_force, or ip_mc_output's dev_loopback_xmit); packets received from the wire have skb_dst == NULL at sch_handle_ingress, so there is no remote trigger. The attacker must be a local user sending packets from a socket.\nAC:L - Triggering is fully deterministic \u2014 a single sendto() to a multicast group with the default IP_MULTICAST_LOOP, or to a local address over lo, reaches the ingress BPF hook with a live IPv4 dst attached. No race, timing window, or unpredictable state is involved.\nPR:L - On a system running a legitimate NAT46/NAT64 tc-BPF program (Android CLAT, Cilium NAT46/64), an ordinary unprivileged user needs nothing beyond an unprivileged UDP socket to generate the looped-back traffic that hits the bug. No capability is required for the triggering action itself.\nUI:N - The attacker generates the triggering packet entirely on their own via a socket send; no victim action, mount, or file open is needed.\nS:U - The corruption and its consequences are confined to the kernel's own memory and networking state within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - ip6_dst_idev() reads rt6i_idev at dst+72 from a 192-byte rtable slab object, an out-of-bounds read into the adjacent object, and the resulting ifindex is stored in IP6CB(skb)->iif and copied to userspace as ipi6_ifindex via IPV6_PKTINFO, yielding a kernel-memory disclosure primitive on top of the type confusion.\nI:H - ip6_rcv_finish() skips the IPv6 route lookup and dst_input() dispatches the IPv4 input handler on an IPv6 skb (and vice versa), a cross-family type confusion in which skb_rtable()->rt_iif and ->rt_flags are read out of rt6_info's address/pointer fields and steer socket demultiplexing and delivery decisions.\nA:H - The confirmed result is a NULL/wild pointer dereference inside ip6_rcv_core() executing in softirq context, producing an immediate kernel oops or panic that any unprivileged user can trigger repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/filter.c"], "versions": [{"version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "a046f183d21ab5ace5a96ece4cf9873a42f003a7", "status": "affected", "versionType": "git"}, {"version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "98b1d8dc9a3170b2614f1e8c93854e75cdd83980", "status": "affected", "versionType": "git"}, {"version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "bfa4d86e130a09f67607482e988313430e38f6c4", "status": "affected", "versionType": "git"}, {"version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "2a3ad42a57b43145839f2f233fb562247658a6d9", "status": "affected", "versionType": "git"}, {"version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "e9994e7b9f7bbb882d13c8191731649249150d21", "status": "affected", "versionType": "git"}, {"version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "ba9db6f907ac02215e30128770f85fbd7db2fcf9", "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/core/filter.c"], "versions": [{"version": "4.8", "status": "affected"}, {"version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.95", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.35", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.4", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16", "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": "4.8", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.95"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.15.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", 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packets received from the wire have skb_dst == NULL at sch_handle_ingress, so there is no remote trigger. The attacker must be a local user sending packets from a socket.\nAC:L - Triggering is fully deterministic \u2014 a single sendto() to a multicast group with the default IP_MULTICAST_LOOP, or to a local address over lo, reaches the ingress BPF hook with a live IPv4 dst attached. No race, timing window, or unpredictable state is involved.\nPR:L - On a system running a legitimate NAT46/NAT64 tc-BPF program (Android CLAT, Cilium NAT46/64), an ordinary unprivileged user needs nothing beyond an unprivileged UDP socket to generate the looped-back traffic that hits the bug. No capability is required for the triggering action itself.\nUI:N - The attacker generates the triggering packet entirely on their own via a socket send; no victim action, mount, or file open is needed.\nS:U - The corruption and its consequences are confined to the kernel's own memory and networking state within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - ip6_dst_idev() reads rt6i_idev at dst+72 from a 192-byte rtable slab object, an out-of-bounds read into the adjacent object, and the resulting ifindex is stored in IP6CB(skb)->iif and copied to userspace as ipi6_ifindex via IPV6_PKTINFO, yielding a kernel-memory disclosure primitive on top of the type confusion.\nI:H - ip6_rcv_finish() skips the IPv6 route lookup and dst_input() dispatches the IPv4 input handler on an IPv6 skb (and vice versa), a cross-family type confusion in which skb_rtable()->rt_iif and ->rt_flags are read out of rt6_info's address/pointer fields and steer socket demultiplexing and delivery decisions.\nA:H - The confirmed result is a NULL/wild pointer dereference inside ip6_rcv_core() executing in softirq context, producing an immediate kernel oops or panic that any unprivileged user can trigger repeatedly."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "a046f183d21ab5ace5a96ece4cf9873a42f003a7", "versionType": "git"}, {"status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "98b1d8dc9a3170b2614f1e8c93854e75cdd83980", "versionType": "git"}, {"status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "bfa4d86e130a09f67607482e988313430e38f6c4", "versionType": "git"}, {"status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "2a3ad42a57b43145839f2f233fb562247658a6d9", "versionType": "git"}, {"status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "e9994e7b9f7bbb882d13c8191731649249150d21", "versionType": "git"}, {"status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "lessThan": "ba9db6f907ac02215e30128770f85fbd7db2fcf9", "versionType": "git"}], "programFiles": ["net/core/filter.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"status": "unaffected", "version": "0", "lessThan": "4.8", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.167", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.95", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.35", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.4", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/core/filter.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/a046f183d21ab5ace5a96ece4cf9873a42f003a7"}, {"url": "https://git.kernel.org/stable/c/98b1d8dc9a3170b2614f1e8c93854e75cdd83980"}, {"url": "https://git.kernel.org/stable/c/bfa4d86e130a09f67607482e988313430e38f6c4"}, {"url": "https://git.kernel.org/stable/c/2a3ad42a57b43145839f2f233fb562247658a6d9"}, {"url": "https://git.kernel.org/stable/c/e9994e7b9f7bbb882d13c8191731649249150d21"}, {"url": "https://git.kernel.org/stable/c/ba9db6f907ac02215e30128770f85fbd7db2fcf9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: clear the dst when changing skb protocol\n\nA not-so-careful NAT46 BPF program can crash the kernel\nif it indiscriminately flips ingress packets from v4 to v6:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n ip6_rcv_core (net/ipv6/ip6_input.c:190:20)\n ipv6_rcv (net/ipv6/ip6_input.c:306:8)\n process_backlog (net/core/dev.c:6186:4)\n napi_poll (net/core/dev.c:6906:9)\n net_rx_action (net/core/dev.c:7028:13)\n do_softirq (kernel/softirq.c:462:3)\n netif_rx (net/core/dev.c:5326:3)\n dev_loopback_xmit (net/core/dev.c:4015:2)\n ip_mc_finish_output (net/ipv4/ip_output.c:363:8)\n NF_HOOK (./include/linux/netfilter.h:314:9)\n ip_mc_output (net/ipv4/ip_output.c:400:5)\n dst_output (./include/net/dst.h:459:9)\n ip_local_out (net/ipv4/ip_output.c:130:9)\n ip_send_skb (net/ipv4/ip_output.c:1496:8)\n udp_send_skb (net/ipv4/udp.c:1040:8)\n udp_sendmsg (net/ipv4/udp.c:1328:10)\n\nThe output interface has a 4->6 program attached at ingress.\nWe try to loop the multicast skb back to the sending socket.\nIngress BPF runs as part of netif_rx(), pushes a valid v6 hdr\nand changes skb->protocol to v6. We enter ip6_rcv_core which\ntries to use skb_dst(). But the dst is still an IPv4 one left\nafter IPv4 mcast output.\n\nClear the dst in all BPF helpers which change the protocol.\nTry to preserve metadata dsts, those may carry non-routing\nmetadata."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.167", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.95", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.35", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15.4", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16", "versionStartIncluding": "4.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:00:17.069Z"}}}, "cveMetadata": {"cveId": "CVE-2025-38192", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:36:17.140Z", "dateReserved": "2025-04-16T04:51:23.993Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-07-04T13:37:16.642Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/filter.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a046f183d21ab5ace5a96ece4cf9873a42f003a7", "status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "versionType": "git"}, {"lessThan": "98b1d8dc9a3170b2614f1e8c93854e75cdd83980", "status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "versionType": "git"}, {"lessThan": "bfa4d86e130a09f67607482e988313430e38f6c4", "status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "versionType": "git"}, {"lessThan": "2a3ad42a57b43145839f2f233fb562247658a6d9", "status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "versionType": "git"}, {"lessThan": "e9994e7b9f7bbb882d13c8191731649249150d21", "status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "versionType": "git"}, {"lessThan": "ba9db6f907ac02215e30128770f85fbd7db2fcf9", "status": "affected", "version": "6578171a7ff0c31dc73258f93da7407510abf085", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/filter.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"lessThan": "4.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.209", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.167", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.95", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.35", "versionType": "semver"}, {"lessThanOrEqual": "6.15.*", "status": "unaffected", "version": "6.15.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "48B353B3-604B-4851-A2E8-6C4F134728E5", "versionEndExcluding": "6.6.95", "versionStartIncluding": "4.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E569FD34-0076-4428-BE17-EECCF867611C", "versionEndExcluding": "6.12.35", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DFD174C5-1AA2-4671-BDDC-1A9FCC753655", "versionEndExcluding": "6.15.4", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*", "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: clear the dst when changing skb protocol\n\nA not-so-careful NAT46 BPF program can crash the kernel\nif it indiscriminately flips ingress packets from v4 to v6:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n ip6_rcv_core (net/ipv6/ip6_input.c:190:20)\n ipv6_rcv (net/ipv6/ip6_input.c:306:8)\n process_backlog (net/core/dev.c:6186:4)\n napi_poll (net/core/dev.c:6906:9)\n net_rx_action (net/core/dev.c:7028:13)\n do_softirq (kernel/softirq.c:462:3)\n netif_rx (net/core/dev.c:5326:3)\n dev_loopback_xmit (net/core/dev.c:4015:2)\n ip_mc_finish_output (net/ipv4/ip_output.c:363:8)\n NF_HOOK (./include/linux/netfilter.h:314:9)\n ip_mc_output (net/ipv4/ip_output.c:400:5)\n dst_output (./include/net/dst.h:459:9)\n ip_local_out (net/ipv4/ip_output.c:130:9)\n ip_send_skb (net/ipv4/ip_output.c:1496:8)\n udp_send_skb (net/ipv4/udp.c:1040:8)\n udp_sendmsg (net/ipv4/udp.c:1328:10)\n\nThe output interface has a 4->6 program attached at ingress.\nWe try to loop the multicast skb back to the sending socket.\nIngress BPF runs as part of netif_rx(), pushes a valid v6 hdr\nand changes skb->protocol to v6. We enter ip6_rcv_core which\ntries to use skb_dst(). But the dst is still an IPv4 one left\nafter IPv4 mcast output.\n\nClear the dst in all BPF helpers which change the protocol.\nTry to preserve metadata dsts, those may carry non-routing\nmetadata."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: borrar el dst al cambiar el protocolo skb Un programa BPF NAT46 no tan cuidadoso puede hacer que el kernel se bloquee si cambia indiscriminadamente los paquetes de entrada de v4 a v6: ERROR: kernel NULL pointer dereference, address: 0000000000000000 ip6_rcv_core (net/ipv6/ip6_input.c:190:20) ipv6_rcv (net/ipv6/ip6_input.c:306:8) process_backlog (net/core/dev.c:6186:4) napi_poll (net/core/dev.c:6906:9) net_rx_action (net/core/dev.c:7028:13) do_softirq (kernel/softirq.c:462:3) netif_rx (net/core/dev.c:5326:3) dev_loopback_xmit (net/core/dev.c:4015:2) ip_mc_finish_output (net/ipv4/ip_output.c:363:8) NF_HOOK (./include/linux/netfilter.h:314:9) ip_mc_output (net/ipv4/ip_output.c:400:5) dst_output (./include/net/dst.h:459:9) ip_local_out (net/ipv4/ip_output.c:130:9) ip_send_skb (net/ipv4/ip_output.c:1496:8) udp_send_skb (net/ipv4/udp.c:1040:8) udp_sendmsg (net/ipv4/udp.c:1328:10) La interfaz de salida tiene un programa 4->6 conectado en la entrada. Intentamos devolver el skb de multidifusi\u00f3n al socket de env\u00edo. El BPF de entrada se ejecuta como parte de netif_rx(), env\u00eda un hdr v6 v\u00e1lido y cambia el protocolo skb a v6. Introducimos ip6_rcv_core, que intenta usar skb_dst(). Sin embargo, el dst sigue siendo IPv4 tras la salida de mcast IPv4. Borre el dst en todos los ayudantes de BPF que cambien el protocolo. Intente conservar los dst de metadatos, ya que pueden contener metadatos no relacionados con el enrutamiento."}], "id": "CVE-2025-38192", "lastModified": "2026-11-10T13:17:46.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38192", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:48:20.544494Z", "version": "2.0.3"}}]}, "published": "2025-07-04T14:15:26.280", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a3ad42a57b43145839f2f233fb562247658a6d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/98b1d8dc9a3170b2614f1e8c93854e75cdd83980"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a046f183d21ab5ace5a96ece4cf9873a42f003a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba9db6f907ac02215e30128770f85fbd7db2fcf9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bfa4d86e130a09f67607482e988313430e38f6c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9994e7b9f7bbb882d13c8191731649249150d21"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: clear the dst when changing skb protocol", "id": "2376403", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376403"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: clear the dst when changing skb protocol\nA not-so-careful NAT46 BPF program can crash the kernel\nif it indiscriminately flips ingress packets from v4 to v6:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nip6_rcv_core (net/ipv6/ip6_input.c:190:20)\nipv6_rcv (net/ipv6/ip6_input.c:306:8)\nprocess_backlog (net/core/dev.c:6186:4)\nnapi_poll (net/core/dev.c:6906:9)\nnet_rx_action (net/core/dev.c:7028:13)\ndo_softirq (kernel/softirq.c:462:3)\nnetif_rx (net/core/dev.c:5326:3)\ndev_loopback_xmit (net/core/dev.c:4015:2)\nip_mc_finish_output (net/ipv4/ip_output.c:363:8)\nNF_HOOK (./include/linux/netfilter.h:314:9)\nip_mc_output (net/ipv4/ip_output.c:400:5)\ndst_output (./include/net/dst.h:459:9)\nip_local_out (net/ipv4/ip_output.c:130:9)\nip_send_skb (net/ipv4/ip_output.c:1496:8)\nudp_send_skb (net/ipv4/udp.c:1040:8)\nudp_sendmsg (net/ipv4/udp.c:1328:10)\nThe output interface has a 4->6 program attached at ingress.\nWe try to loop the multicast skb back to the sending socket.\nIngress BPF runs as part of netif_rx(), pushes a valid v6 hdr\nand changes skb->protocol to v6. We enter ip6_rcv_core which\ntries to use skb_dst(). But the dst is still an IPv4 one left\nafter IPv4 mcast output.\nClear the dst in all BPF helpers which change the protocol.\nTry to preserve metadata dsts, those may carry non-routing\nmetadata."], "name": "CVE-2025-38192", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38192\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38192\nhttps://lore.kernel.org/linux-cve-announce/2025070415-CVE-2025-38192-6a15@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T21:47:49.922778+00:00", "updated": "2025-07-13T21:47:49.922829+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}