{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80681", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.783Z", "datePublished": "2026-08-28T06:52:48.896Z", "dateUpdated": "2026-08-29T06:22:07.840Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:07.840Z"}, "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()."}], "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": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "bf045341dfb3e767f0ff94cf240ce3c371973bd4", "status": "affected", "versionType": "git"}, {"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "2355c8c26d2aa1b4385b369e67202e47d460d555", "status": "affected", "versionType": "git"}, {"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585", "status": "affected", "versionType": "git"}, {"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "1235e017aa11cf01e91b613c4c5ed6aa28934fff", "status": "affected", "versionType": "git"}, {"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "c9dceac9e1c7c772c43c732fc0d325e72835801a", "status": "affected", "versionType": "git"}, {"version": "ae8840825605f36f98f247323edc150e761cb64e", "lessThan": "1395a676ec15a0a02a2a6d86602324f2d5fd41d5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "3.10", "status": "affected"}, {"version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "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", "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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6375093eb45cd7d89f1945f939eeae3b29d79f56", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "1b7f7b653e3557690047c62f03b80a24ea5a58a5", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "bf045341dfb3e767f0ff94cf240ce3c371973bd4", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "2355c8c26d2aa1b4385b369e67202e47d460d555", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "1235e017aa11cf01e91b613c4c5ed6aa28934fff", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "c9dceac9e1c7c772c43c732fc0d325e72835801a", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}, {"lessThan": "1395a676ec15a0a02a2a6d86602324f2d5fd41d5", "status": "affected", "version": "ae8840825605f36f98f247323edc150e761cb64e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.10"}, {"lessThan": "3.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"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": "2026-08-29T07:16:50.530", "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"}]}, "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"}

{}

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