{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64580", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.798Z", "datePublished": "2026-08-05T08:09:34.946Z", "dateUpdated": "2026-08-08T15:13:17.154Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-08T15:13:17.154Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()\n\nOn the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst()\nreleases the device reference with netdev_put() but leaves\nxdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev)\nagain, so the same net_device reference is released twice, underflowing\nits refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for\n<dev> to become free\").\n\nClear xdst->u.dst.dev after the netdev_put(), the same way the XFRM\ndevice-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in\nnet/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error.\n\n ref_tracker: reference already released.\n ref_tracker: allocated in:\n xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86)\n ...\n udpv6_sendmsg (net/ipv6/udp.c:1696)\n ...\n ref_tracker: freed in:\n xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90)\n ...\n WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780\n dst_destroy (net/core/dst.c:115)\n rcu_core\n handle_softirqs\n ..."}], "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 bug is reached on the local IPv6 outbound path (udpv6_sendmsg \u2192 xfrm_lookup \u2192 xfrm6_fill_dst) after configuring XFRM policy/state via netlink or IPV6_XFRM_POLICY; a remote peer cannot drive that configuration or the device state that makes in6_dev_get fail.\nAC:L - An attacker in their own netns can create interfaces, install IPv6 XFRM policy/state, generate matching UDP traffic, and concurrently drop MTU below IPV6_MIN_MTU or unregister the device to clear ip6_ptr, so they control both sides of the window that hits the error path; once entered, the double netdev_put is deterministic.\nPR:L - XFRM configuration requires CAP_NET_ADMIN via netlink_net_capable/sockopt_ns_capable, which is ns_capable() in the netns user_ns, so an unprivileged user obtains it with unshare -Urn rather than real init-namespace root.\nUI:N - No victim action is required; the attacker configures XFRM, manipulates their own netdevs, and sends packets entirely with their own processes.\nS:U - The impact is kernel net_device refcount corruption within the same host kernel authority; this is ordinary local privilege-escalation/DoS territory, not a VM escape or IOMMU/sandbox boundary cross.\nC:H - The leftover dst.dev causes a second netdev_put in dst_destroy, underflowing the net_device refcount and enabling use-after-free of the device object, which per kernel UAF guidance yields a high confidentiality/info-disclosure primitive.\nI:H - A net_device refcount underflow/UAF is heap memory corruption that can be shaped via reuse/spraying into arbitrary write or control-flow hijack, so integrity impact is high.\nA:H - Even without full exploitation, the double put triggers ref_tracker warnings and can oops/panic or hang device unregister (unregister_netdevice waiting for the device to become free), so availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/xfrm6_policy.c"], "versions": [{"version": "84c4a9dfbf430861e7588d95ae3ff61535dca351", "lessThan": "df6856c2dda9187601d29b5fbd7a81b3b178cedf", "status": "affected", "versionType": "git"}, {"version": "84c4a9dfbf430861e7588d95ae3ff61535dca351", "lessThan": "43de8a49335e611adb271bbd52e84dfbc11fc185", "status": "affected", "versionType": "git"}, {"version": "84c4a9dfbf430861e7588d95ae3ff61535dca351", "lessThan": "ff636d7b7cba6dea82ecf580415ea57f2c1a11b6", "status": "affected", "versionType": "git"}, {"version": "84c4a9dfbf430861e7588d95ae3ff61535dca351", "lessThan": "e078da1b4e11390cff3201c19a9a1fe70c5b934f", "status": "affected", "versionType": "git"}, {"version": "84c4a9dfbf430861e7588d95ae3ff61535dca351", "lessThan": "136992de9bb91871084ae52d172610541c76e4d2", "status": "affected", "versionType": "git"}, {"version": "a7e22d0c0e81dde129a51ee413644124f4b59954", "status": "affected", "versionType": "git"}, {"version": "01b0d887f67a388fb2a658ee2bdd74e5ba146818", "status": "affected", "versionType": "git"}, {"version": "a98124aac0b5adc5de8ae54f11322781cb4d85c3", "status": "affected", "versionType": "git"}, {"version": "e27b7bee743d921f037b1da6f071237345bef7c1", "status": "affected", "versionType": "git"}, {"version": "3.0.79", "lessThan": "3.1", "status": "affected", "versionType": "semver"}, {"version": "3.2.46", "lessThan": "3.3", "status": "affected", "versionType": "semver"}, {"version": "3.4.46", "lessThan": "3.5", "status": "affected", "versionType": "semver"}, {"version": "3.9.3", "lessThan": "3.10", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/xfrm6_policy.c"], "versions": [{"version": "3.10", "status": "affected"}, {"version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "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": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.2-rc4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.0.79"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf"}, {"url": "https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185"}, {"url": "https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6"}, {"url": "https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f"}, {"url": "https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2"}], "title": "xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84c4a9dfbf430861e7588d95ae3ff61535dca351,df6856c2dda9187601d29b5fbd7a81b3b178cedf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84c4a9dfbf430861e7588d95ae3ff61535dca351,43de8a49335e611adb271bbd52e84dfbc11fc185)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84c4a9dfbf430861e7588d95ae3ff61535dca351,ff636d7b7cba6dea82ecf580415ea57f2c1a11b6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84c4a9dfbf430861e7588d95ae3ff61535dca351,e078da1b4e11390cff3201c19a9a1fe70c5b934f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84c4a9dfbf430861e7588d95ae3ff61535dca351,136992de9bb91871084ae52d172610541c76e4d2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a7e22d0c0e81dde129a51ee413644124f4b59954"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "01b0d887f67a388fb2a658ee2bdd74e5ba146818"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a98124aac0b5adc5de8ae54f11322781cb4d85c3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "e27b7bee743d921f037b1da6f071237345bef7c1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.79,3.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.46,3.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.46,3.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.9.3,3.10)"}}], "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": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc4,*]"}}], "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": "2026-08-05T09:30:11.603315+00:00", "updated": "2026-08-08T20:00:04.507041+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}