CVE-2026-89487 (GCVE-0-2026-89487)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:47
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: openvswitch: only skb_tx_error() a packet we are about to drop queue_userspace_packet() borrows the packet skb -- it only copies it into a private netlink message (user_skb) and does not own it; on return do_execute_actions() keeps forwarding it through the flow's remaining actions. Its error path nevertheless calls skb_tx_error(skb), which via skb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY, stripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s kerneldoc says "skb must be freed afterwards"). For a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is what makes esp_input() skb_cow_data() before in-place AEAD; once it is stripped a later local ESP-in-UDP delivery decrypts in place over pages the sender does not own -- an unprivileged page-cache write (the "Fragnesia" primitive). do_execute_actions() ignores output_userspace()'s return value, so any action after a failed USERSPACE upcall inherits the stripped skb. Move the skb_tx_error() to the flow-miss drop path - the "default" branch of ovs_dp_process_packet()'s switch(error), before kfree_skb(). The call has been here since commit 36d5fe6a0007 ("core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors") but was harmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate in-place decrypt; only then did stripping it on a still-forwarded skb become a page-cache write primitive.
References
Impacted products
Vendor Product Version
Linux Linux Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: 36d5fe6a000790f56039afe26834265db0a3ad4c
Version: c5f0c0e7525443add533495e93ba8de6feab2396
Version: 1674b4bf3eea3cac51b70778e89f8025f7cfe695
Version: 3.10.51   ≤
Version: 3.12.40   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: only skb_tx_error() a packet we are about to drop\n\nqueue_userspace_packet() borrows the packet skb -- it only copies it into\na private netlink message (user_skb) and does not own it; on return\ndo_execute_actions() keeps forwarding it through the flow\u0027s remaining\nactions. Its error path nevertheless calls skb_tx_error(skb), which via\nskb_zcopy_clear() does skb_shinfo(skb)-\u003eflags \u0026= ~SKBFL_ALL_ZEROCOPY,\nstripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()\u0027s kerneldoc\nsays \"skb must be freed afterwards\").\n\nFor a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is\nwhat makes esp_input() skb_cow_data() before in-place AEAD; once it is\nstripped a later local ESP-in-UDP delivery decrypts in place over pages\nthe sender does not own -- an unprivileged page-cache write (the\n\"Fragnesia\" primitive).\ndo_execute_actions() ignores output_userspace()\u0027s return value, so any\naction after a failed USERSPACE upcall inherits the stripped skb.\n\nMove the skb_tx_error() to the flow-miss drop path - the \"default\"\nbranch of ovs_dp_process_packet()\u0027s switch(error), before kfree_skb().\n\nThe call has been here since commit 36d5fe6a0007 (\"core, nfqueue,\nopenvswitch: Orphan frags in skb_zerocopy and handle errors\") but was\nharmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate\nin-place decrypt; only then did stripping it on a still-forwarded skb\nbecome a page-cache write primitive."
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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              "value": "AV:L - The strip runs only on a locally originated MSG_ZEROCOPY skb that still has a zerocopy uarg (skb_zcopy_clear is a no-op otherwise); NIC-received packets never carry that uarg, and the later in-place ESP decrypt is via a local SA, so a local account is required.\nAC:L - The attacker fully controls the OVS flow (non-last USERSPACE with a PID that makes genlmsg_unicast fail), the MSG_ZEROCOPY send, and the ESP SA/payload; do_execute_actions() ignores the upcall error, so the shared-frag strip and in-place decrypt are deterministic with no race beyond attacker influence.\nPR:L - OVS genetlink families are netnsok and use GENL_UNS_ADMIN_PERM (CAP_NET_ADMIN in the socket user_ns); an unprivileged user can unshare -Urn, create a datapath/flow, enable SO_ZEROCOPY, and install xfrm SAs, while the global page cache remains the corruption target.\nUI:N - The attacker installs the OVS userspace-then-output flow, sends the MSG_ZEROCOPY packet, and completes local ESP-in-UDP delivery without any victim action such as opening a file or mounting a filesystem.\nS:U - The resulting page-cache write is a standard in-kernel memory-corruption/privilege-escalation primitive on the same host; it does not cross a VM hypervisor or IOMMU security boundary.\nC:H - Clearing SKBFL_SHARED_FRAG lets later esp_input() skip skb_cow_data() and AEAD-decrypt in place over page-cache-backed frags, a write primitive into globally cached file/code pages that can be leveraged for arbitrary disclosure.\nI:H - With the shared-frag marker stripped, ESP decrypts attacker-controlled plaintext in place over page-cache pages the sender does not own, yielding the Fragnesia unprivileged write into files the attacker could only read.\nA:H - In-place writes into page-cache-backed or still-mapped zerocopy pages corrupt shared kernel/file state and readily cause oopses, panics, and process crashes; skb_tx_error also completes the uarg while the skb is still in flight."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a"
        },
        {
          "url": "https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545"
        },
        {
          "url": "https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae"
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          "url": "https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e"
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      "title": "openvswitch: only skb_tx_error() a packet we are about to drop",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89487",
    "datePublished": "2026-09-11T19:43:40.776Z",
    "dateReserved": "2026-09-11T19:38:34.713Z",
    "dateUpdated": "2026-10-19T08:47:37.837Z",
    "state": "PUBLISHED"
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-89487\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T19:22:44.373891Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T19:22:45.531Z\"}}], \"cna\": {\"title\": \"openvswitch: only skb_tx_error() a packet we are about to drop\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The strip runs only on a locally originated MSG_ZEROCOPY skb that still has a zerocopy uarg (skb_zcopy_clear is a no-op otherwise); NIC-received packets never carry that uarg, and the later in-place ESP decrypt is via a local SA, so a local account is required.\\nAC:L - The attacker fully controls the OVS flow (non-last USERSPACE with a PID that makes genlmsg_unicast fail), the MSG_ZEROCOPY send, and the ESP SA/payload; do_execute_actions() ignores the upcall error, so the shared-frag strip and in-place decrypt are deterministic with no race beyond attacker influence.\\nPR:L - OVS genetlink families are netnsok and use GENL_UNS_ADMIN_PERM (CAP_NET_ADMIN in the socket user_ns); an unprivileged user can unshare -Urn, create a datapath/flow, enable SO_ZEROCOPY, and install xfrm SAs, while the global page cache remains the corruption target.\\nUI:N - The attacker installs the OVS userspace-then-output flow, sends the MSG_ZEROCOPY packet, and completes local ESP-in-UDP delivery without any victim action such as opening a file or mounting a filesystem.\\nS:U - The resulting page-cache write is a standard in-kernel memory-corruption/privilege-escalation primitive on the same host; it does not cross a VM hypervisor or IOMMU security boundary.\\nC:H - Clearing SKBFL_SHARED_FRAG lets later esp_input() skip skb_cow_data() and AEAD-decrypt in place over page-cache-backed frags, a write primitive into globally cached file/code pages that can be leveraged for arbitrary disclosure.\\nI:H - With the shared-frag marker stripped, ESP decrypts attacker-controlled plaintext in place over page-cache pages the sender does not own, yielding the Fragnesia unprivileged write into files the attacker could only read.\\nA:H - In-place writes into page-cache-backed or still-mapped zerocopy pages corrupt shared kernel/file state and readily cause oopses, panics, and process crashes; skb_tx_error also completes the uarg while the skb is still in flight.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"48db11e115d1b232edc5591604adc6eda95cd545\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"4477222e2916a18e273edc139c955ade6bbb7a69\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"4d5c460ef8754be1d43b16dbf02695b008b207d6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"6767d70cf46f65807a6a4c4406a518e6c12e36ae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"e41a59fc056f63a7a1f42788913c53cc48d744aa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"5d85eef222cfd28e73deed7402c100229e8b9e6e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\", \"lessThan\": \"0dbc2398fca3bb33eda963849f865ddb1b3aa05e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c5f0c0e7525443add533495e93ba8de6feab2396\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1674b4bf3eea3cac51b70778e89f8025f7cfe695\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3.10.51\", \"lessThan\": \"3.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.12.40\", \"lessThan\": \"3.13\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/openvswitch/datapath.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"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/openvswitch/datapath.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a\"}, {\"url\": \"https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545\"}, {\"url\": \"https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69\"}, {\"url\": \"https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6\"}, {\"url\": \"https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae\"}, {\"url\": \"https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa\"}, {\"url\": \"https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e\"}, {\"url\": \"https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nopenvswitch: only skb_tx_error() a packet we are about to drop\\n\\nqueue_userspace_packet() borrows the packet skb -- it only copies it into\\na private netlink message (user_skb) and does not own it; on return\\ndo_execute_actions() keeps forwarding it through the flow\u0027s remaining\\nactions. Its error path nevertheless calls skb_tx_error(skb), which via\\nskb_zcopy_clear() does skb_shinfo(skb)-\u003eflags \u0026= ~SKBFL_ALL_ZEROCOPY,\\nstripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()\u0027s kerneldoc\\nsays \\\"skb must be freed afterwards\\\").\\n\\nFor a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is\\nwhat makes esp_input() skb_cow_data() before in-place AEAD; once it is\\nstripped a later local ESP-in-UDP delivery decrypts in place over pages\\nthe sender does not own -- an unprivileged page-cache write (the\\n\\\"Fragnesia\\\" primitive).\\ndo_execute_actions() ignores output_userspace()\u0027s return value, so any\\naction after a failed USERSPACE upcall inherits the stripped skb.\\n\\nMove the skb_tx_error() to the flow-miss drop path - the \\\"default\\\"\\nbranch of ovs_dp_process_packet()\u0027s switch(error), before kfree_skb().\\n\\nThe call has been here since commit 36d5fe6a0007 (\\\"core, nfqueue,\\nopenvswitch: Orphan frags in skb_zerocopy and handle errors\\\") but was\\nharmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate\\nin-place decrypt; only then did stripping it on a still-forwarded skb\\nbecome a page-cache write primitive.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"3.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.10.51\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.12.40\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:47:37.837Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89487\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:47:37.837Z\", \"dateReserved\": \"2026-09-11T19:38:34.713Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:43:40.776Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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