CVE-2026-64580 (GCVE-0-2026-64580)
Vulnerability from cvelistv5
Published
2026-08-05 08:09
Modified
2026-10-19 20:48
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + "unregister_netdevice: waiting for <dev> to become free"). Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error. ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...
References
Impacted products
Vendor Product Version
Linux Linux Version: 84c4a9dfbf430861e7588d95ae3ff61535dca351
Version: 84c4a9dfbf430861e7588d95ae3ff61535dca351
Version: 84c4a9dfbf430861e7588d95ae3ff61535dca351
Version: 84c4a9dfbf430861e7588d95ae3ff61535dca351
Version: 84c4a9dfbf430861e7588d95ae3ff61535dca351
Version: 84c4a9dfbf430861e7588d95ae3ff61535dca351
Version: a7e22d0c0e81dde129a51ee413644124f4b59954
Version: 01b0d887f67a388fb2a658ee2bdd74e5ba146818
Version: a98124aac0b5adc5de8ae54f11322781cb4d85c3
Version: e27b7bee743d921f037b1da6f071237345bef7c1
Version: 3.0.79   ≤
Version: 3.2.46   ≤
Version: 3.4.46   ≤
Version: 3.9.3   ≤
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              "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."
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    "cveId": "CVE-2026-64580",
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[\"net/ipv6/xfrm6_policy.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\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/xfrm6_policy.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a\"}, {\"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003eu.dst.dev set. dst_destroy() later calls netdev_put(dst-\u003edev)\\nagain, so the same net_device reference is released twice, underflowing\\nits refcount (ref_tracker WARNING + \\\"unregister_netdevice: waiting for\\n\u003cdev\u003e to become free\\\").\\n\\nClear xdst-\u003eu.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 -\u003edev 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   ...\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.0.79\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.46\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.4.46\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.9.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:29:07.038Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64580\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:48:42.908Z\", \"dateReserved\": \"2026-07-19T15:36:31.798Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-05T08:09:34.946Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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