CVE-2026-80681

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eth->h_dest.\n\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in vxlan_xmit(), reached when the kernel transmits packets out a VXLAN netdev via routing, bridging, or overlay forwarding; remote peers can inject IPv4/IPv6 Ethernet frames that traverse this TX path on cloud, Kubernetes, and data-center VXLAN deployments.\nAC:L - An attacker controlling overlay or forwarded traffic can reliably meet RSC prerequisites (router FDB entry, IPv4/IPv6 ethertype, neighbour MAC mismatch, cloned/nonlinear skb) so route_shortcircuit() calls pskb_may_pull/skb_cow_head and reallocates skb->head, invalidating the cached eth pointer.\nPR:N - Exploitation requires only sending network traffic processed by an existing VXLAN interface with RSC enabled, not host administrator credentials; remote overlay peers and unauthenticated senders whose packets are forwarded through VXLAN need no elevated privileges on the target.\nUI:N - The use-after-free is triggered automatically during kernel packet transmit processing in vxlan_xmit() with no action required from a local user or administrator beyond normal network operation on a VXLAN-enabled host.\nS:U - The stale eth_hdr pointer causes heap use-after-free within the kernel's own memory domain during VXLAN transmit processing; impact is standard in-kernel memory corruption and does not inherently cross VM, container, or IOMMU security boundaries.\nC:H - After route_shortcircuit() reallocates skb->head, vxlan_xmit() dereferences the stale eth pointer for eth->h_dest, constituting a heap use-after-free read that can disclose adjacent freed slab contents and support further kernel memory disclosure primitives.\nI:H - Use-after-free of the Ethernet header buffer in skb head memory enables attacker-controlled reuse of freed kmalloc slabs, a well-established path to heap grooming and arbitrary kernel memory corruption or control-flow hijacking beyond the immediate MAC header read.\nA:H - Dereferencing a freed skb head pointer in vxlan_xmit() can cause an immediate kernel oops or panic from invalid memory access, and UAF heap corruption routinely destabilizes or crashes the system even when full exploitation is not pursued."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "6375093eb45cd7d89f1945f939eeae3b29d79f56", "status": "affected", "versionType": "git"}, {"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "1b7f7b653e3557690047c62f03b80a24ea5a58a5", "status": "affected", "versionType": "git"}, {"version": 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"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": "3.10", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a"}, {"url": "https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5"}], "title": "vxlan: re-fetch eth header after route_shortcircuit()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-80681", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:19:50.454403Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:32.921Z"}}]}}

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and data-center VXLAN deployments.\nAC:L - An attacker controlling overlay or forwarded traffic can reliably meet RSC prerequisites (router FDB entry, IPv4/IPv6 ethertype, neighbour MAC mismatch, cloned/nonlinear skb) so route_shortcircuit() calls pskb_may_pull/skb_cow_head and reallocates skb->head, invalidating the cached eth pointer.\nPR:N - Exploitation requires only sending network traffic processed by an existing VXLAN interface with RSC enabled, not host administrator credentials; remote overlay peers and unauthenticated senders whose packets are forwarded through VXLAN need no elevated privileges on the target.\nUI:N - The use-after-free is triggered automatically during kernel packet transmit processing in vxlan_xmit() with no action required from a local user or administrator beyond normal network operation on a VXLAN-enabled host.\nS:U - The stale eth_hdr pointer causes heap use-after-free within the kernel's own memory domain during VXLAN transmit processing; impact is standard in-kernel memory corruption and does not inherently cross VM, container, or IOMMU security boundaries.\nC:H - After route_shortcircuit() reallocates skb->head, vxlan_xmit() dereferences the stale eth pointer for eth->h_dest, constituting a heap use-after-free read that can disclose adjacent freed slab contents and support further kernel memory disclosure primitives.\nI:H - Use-after-free of the Ethernet header buffer in skb head memory enables attacker-controlled reuse of freed kmalloc slabs, a well-established path to heap grooming and arbitrary kernel memory corruption or control-flow hijacking beyond the immediate MAC header read.\nA:H - Dereferencing a freed skb head pointer in vxlan_xmit() can cause an immediate kernel oops or panic from invalid memory access, and UAF heap corruption routinely destabilizes or crashes the system even when full exploitation is not pursued."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", 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{"status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "c9dceac9e1c7c772c43c732fc0d325e72835801a", "versionType": "git"}, {"status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "1395a676ec15a0a02a2a6d86602324f2d5fd41d5", "versionType": "git"}], "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.10"}, {"status": "unaffected", "version": "0", "lessThan": "3.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": 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"https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585"}, {"url": "https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff"}, {"url": "https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a"}, {"url": "https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: re-fetch eth header after route_shortcircuit()\n\nBefore route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).\n\nInside route_shortcircuit(), pskb_may_pull() can be called, which may\nreallocate skb->head.\n\nIn this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to\nfreed memory, leading to a use-after-free when dereferencing eth->h_dest.\n\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit()."}], "cpeApplicability": [{"nodes": 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{"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "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", "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\nvxlan: re-fetch eth header after route_shortcircuit()\n\nBefore route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).\n\nInside route_shortcircuit(), pskb_may_pull() can be called, which may\nreallocate skb->head.\n\nIn this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to\nfreed memory, leading to a use-after-free when dereferencing eth->h_dest.\n\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit()."}], "id": "CVE-2026-80681", "lastModified": "2026-10-16T20:18:06.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80681", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:19:50.454403Z", "version": "2.0.3"}}]}, "published": "2026-08-28T08:16:53.473", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vxlan: re-fetch eth header after route_shortcircuit()", "id": "2525430", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525430"}, "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"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvxlan: re-fetch eth header after route_shortcircuit()\nBefore route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).\nInside route_shortcircuit(), pskb_may_pull() can be called, which may\nreallocate skb->head.\nIn this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to\nfreed memory, leading to a use-after-free when dereferencing eth->h_dest.\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().", "A flaw was found in the Linux kernel's vxlan component. A use-after-free vulnerability exists due to improper handling of the Ethernet header pointer after `route_shortcircuit()` is called. When `pskb_may_pull()` reallocates the `skb->head`, the previously cached Ethernet header pointer becomes stale, leading to a use-after-free when `eth->h_dest` is dereferenced. A remote attacker could exploit this to potentially cause a denial of service or execute arbitrary code."], "name": "CVE-2026-80681", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80681\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80681\nhttps://lore.kernel.org/linux-cve-announce/2026082801-CVE-2026-80681-6c7c@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,6375093eb45cd7d89f1945f939eeae3b29d79f56)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,1b7f7b653e3557690047c62f03b80a24ea5a58a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,bf045341dfb3e767f0ff94cf240ce3c371973bd4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,2355c8c26d2aa1b4385b369e67202e47d460d555)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,1235e017aa11cf01e91b613c5ed6aa28934fff)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,c9dceac9e1c7c772c43c732fc0d325e72835801a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ae8840825605f36f98f247323edc150e761cb64e,1395a676ec15a0a02a2a6d86602324f2d5fd41d5)"}}], "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": "3.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.151,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2,*]"}}], "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": "2026-08-28T12:45:02.928566+00:00", "updated": "2026-09-01T15:00:11.918410+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}