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CVE-2026-89487 (GCVE-0-2026-89487)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
openvswitch: only skb_tx_error() a packet we are about to drop
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 48db11e115d1b232edc5591604adc6eda95cd545 (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 4477222e2916a18e273edc139c955ade6bbb7a69 (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 4d5c460ef8754be1d43b16dbf02695b008b207d6 (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 6767d70cf46f65807a6a4c4406a518e6c12e36ae (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < e41a59fc056f63a7a1f42788913c53cc48d744aa (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 5d85eef222cfd28e73deed7402c100229e8b9e6e (git)
Affected: 36d5fe6a000790f56039afe26834265db0a3ad4c , < 0dbc2398fca3bb33eda963849f865ddb1b3aa05e (git)
Affected: c5f0c0e7525443add533495e93ba8de6feab2396 (git)
Affected: 1674b4bf3eea3cac51b70778e89f8025f7cfe695 (git)
Affected: 3.10.51 , < 3.11 (semver)
Affected: 3.12.40 , < 3.13 (semver)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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        {
          "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."
        }
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      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "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."
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        "dateUpdated": "2026-09-14T12:00:22.434Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        },
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e"
        }
      ],
      "title": "openvswitch: only skb_tx_error() a packet we are about to drop",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89487",
    "datePublished": "2026-09-11T19:43:40.776Z",
    "dateReserved": "2026-09-11T19:38:34.713Z",
    "dateUpdated": "2026-09-14T12:00:22.434Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89487",
      "date": "2026-09-15",
      "epss": "0.00129",
      "percentile": "0.02886"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-14T14:57:33.000Z",
      "cve": "CVE-2026-89487",
      "id": "msrc_CVE-2026-89487",
      "initial_release_date": "2026-09-13T01:10:34.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "openvswitch: only skb_tx_error() a packet we are about to drop",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89487.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89487\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:30.413\",\"lastModified\":\"2026-09-14T13:19:05.460\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/openvswitch/datapath.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/openvswitch/datapath.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-15T08:13:00+00:00",
      "cve": "CVE-2026-89487",
      "id": "CVE-2026-89487",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "262",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: openvswitch: only skb_tx_error() a packet we are about to drop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:03:03Z",
      "cve": "CVE-2026-89487",
      "id": "CVE-2026-89487",
      "initial_release_date": "2026-09-12T16:27:36Z",
      "product_status:known_affected": "349",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89487",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89487.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.