CVE-2026-89564

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Both address families can also prefetch a socket in UDP early demux.\nIn both paths (BPF and UDP early demux) a reference is not guaranteed to\nbe held on the socket.\n\nWhen a multicast packet is not locally deliverable, IPv6 hands the\noriginal skb to ip6_mr_input(). IPv4's ip_mr_input() similarly keeps the\noriginal skb when local delivery is not needed. Either path can put the\nskb on an unresolved multicast route queue or forward it after the\nreceive-side RCU section ends.\n\nAfter the prefetched socket is destroyed, a later skb free invokes\nsock_pfree() and dereferences the stale skb->sk. Orphan the skb before\neach non-local multicast forwarding path. Local delivery retains the\noriginal skb; the existing skb_clone() calls provide multicast forwarding\nwith a socket-free clone."}], "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 UAF requires the attacker to attach a no-ref skb->sk (UDP early demux or bpf_sk_assign) and destroy that socket while the skb sits on the mroute unresolved queue; a remote multicast datagram does not prefetch onto non-local ip_mr_input/ip6_mr_input (mcast early demux needs membership, which clones; ip_forward drops skb->sk).\nAC:L - The attacker owns every step: enable mroute, bind/connect a UDP socket or attach TC bpf_sk_assign, inject a non-local multicast skb so ipmr_cache_unresolved() queues it for 10s, then close the socket and wait for kfree_skb; no uncontrolled race or memory layout is required.\nPR:L - MRT_INIT needs a raw IGMP/ICMPv6 socket (ns_capable CAP_NET_RAW) and VIFs/TC bpf_sk_assign need CAP_NET_ADMIN in the netns; an unprivileged user obtains both via unshare -Urn and never needs real init-namespace root.\nUI:N - The attacker performs the entire setup, packet injection, and socket close in their own user/net namespace; no other user must mount, open a file, or otherwise interact.\nS:U - The sock_pfree use-after-free corrupts kernel memory in the same host networking authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - sock_pfree() dereferences the stale skb->sk after the SOCK_RCU_FREE socket is destroyed; that UAF on a struct sock can be reclaimed with attacker-controlled objects, yielding an arbitrary read primitive.\nI:H - If the reused object looks refcounted, sock_pfree() calls sock_gen_put() and refcount_dec_and_test() on the freed sock, giving a UAF write/control-flow hijack primitive via heap spray.\nA:H - Freeing the queued skb after socket destruction oopses in sock_pfree() even without a full exploit, so the bug is a reliable kernel crash as well as a UAF."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/ipmr.c", "net/ipv6/ip6_input.c"], "versions": [{"version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "592b91f41d4f35e37c9e0be1c46a4c28437642cd", "status": "affected", "versionType": "git"}, {"version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "882212d317a7c16ab70d20656f6b1c42abada9f6", "status": "affected", "versionType": "git"}, {"version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "e62aef7d6a5b27569bf540bbe11a9482117ff588", "status": "affected", "versionType": "git"}, {"version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce", "status": "affected", "versionType": "git"}, {"version": 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ip_forward drops skb->sk).\nAC:L - The attacker owns every step: enable mroute, bind/connect a UDP socket or attach TC bpf_sk_assign, inject a non-local multicast skb so ipmr_cache_unresolved() queues it for 10s, then close the socket and wait for kfree_skb; no uncontrolled race or memory layout is required.\nPR:L - MRT_INIT needs a raw IGMP/ICMPv6 socket (ns_capable CAP_NET_RAW) and VIFs/TC bpf_sk_assign need CAP_NET_ADMIN in the netns; an unprivileged user obtains both via unshare -Urn and never needs real init-namespace root.\nUI:N - The attacker performs the entire setup, packet injection, and socket close in their own user/net namespace; no other user must mount, open a file, or otherwise interact.\nS:U - The sock_pfree use-after-free corrupts kernel memory in the same host networking authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - sock_pfree() dereferences the stale skb->sk after the SOCK_RCU_FREE socket is destroyed; that UAF on a struct sock can be reclaimed with attacker-controlled objects, yielding an arbitrary read primitive.\nI:H - If the reused object looks refcounted, sock_pfree() calls sock_gen_put() and refcount_dec_and_test() on the freed sock, giving a UAF write/control-flow hijack primitive via heap spray.\nA:H - Freeing the queued skb after socket destruction oopses in sock_pfree() even without a full exploit, so the bug is a reliable kernel crash as well as a UAF."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "882212d317a7c16ab70d20656f6b1c42abada9f6", "versionType": "git"}, {"status": "affected", "version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "e62aef7d6a5b27569bf540bbe11a9482117ff588", "versionType": "git"}, {"status": "affected", "version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce", "versionType": "git"}, {"status": "affected", "version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "f1281d4b99089fbaf0d3579bba62a814ebb4de4d", "versionType": "git"}, {"status": "affected", "version": "cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449", "lessThan": "e36ce6e78fe3fc3c071a26750783b7ba081ce10d", "versionType": "git"}], "programFiles": ["net/ipv4/ipmr.c", "net/ipv6/ip6_input.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"status": "unaffected", "version": "0", "lessThan": "5.7", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.111", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv4/ipmr.c", "net/ipv6/ip6_input.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/882212d317a7c16ab70d20656f6b1c42abada9f6"}, {"url": "https://git.kernel.org/stable/c/e62aef7d6a5b27569bf540bbe11a9482117ff588"}, {"url": "https://git.kernel.org/stable/c/a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce"}, {"url": "https://git.kernel.org/stable/c/f1281d4b99089fbaf0d3579bba62a814ebb4de4d"}, {"url": "https://git.kernel.org/stable/c/e36ce6e78fe3fc3c071a26750783b7ba081ce10d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip: orphan prefetched skbs before multicast forwarding\n\nIPv4 and IPv6 input preserve an skb->sk association installed by\nbpf_sk_assign() so that local delivery can use the selected socket under\nRCU. 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Both address families can also prefetch a socket in UDP early demux.\nIn both paths (BPF and UDP early demux) a reference is not guaranteed to\nbe held on the socket.\n\nWhen a multicast packet is not locally deliverable, IPv6 hands the\noriginal skb to ip6_mr_input(). IPv4's ip_mr_input() similarly keeps the\noriginal skb when local delivery is not needed. Either path can put the\nskb on an unresolved multicast route queue or forward it after the\nreceive-side RCU section ends.\n\nAfter the prefetched socket is destroyed, a later skb free invokes\nsock_pfree() and dereferences the stale skb->sk. Orphan the skb before\neach non-local multicast forwarding path. Local delivery retains the\noriginal skb; the existing skb_clone() calls provide multicast forwarding\nwith a socket-free clone."}], "id": "CVE-2026-89564", "lastModified": "2026-10-30T13:20:21.897", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89564", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:24:14.849445Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:40.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/592b91f41d4f35e37c9e0be1c46a4c28437642cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/882212d317a7c16ab70d20656f6b1c42abada9f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e36ce6e78fe3fc3c071a26750783b7ba081ce10d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e62aef7d6a5b27569bf540bbe11a9482117ff588"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1281d4b99089fbaf0d3579bba62a814ebb4de4d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel: Use-after-free in IP multicast forwarding can lead to denial of service", "id": "2532326", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532326"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's IP multicast forwarding. When a prefetched socket is destroyed, a subsequent operation to free a network packet (skb) can attempt to access the already freed socket memory. This use-after-free vulnerability can be triggered by a remote attacker sending specially crafted multicast packets. A successful exploit could lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-89564", "public_date": "2026-09-11T19:44:35Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89564\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89564\nhttps://git.kernel.org/stable/c/a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce\nhttps://git.kernel.org/stable/c/e36ce6e78fe3fc3c071a26750783b7ba081ce10d\nhttps://git.kernel.org/stable/c/f1281d4b99089fbaf0d3579bba62a814ebb4de4d"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449,a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449,f1281d4b99089fbaf0d3579bba62a814ebb4de4d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449,e36ce6e78fe3fc3c071a26750783b7ba081ce10d)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T10:00:08.636382+00:00", "updated": "2026-09-15T22:00:17.601472+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}