{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80977",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80977"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "net: skbuff: don't touch shared zerocopy state in skb_tx_error()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: don't touch shared zerocopy state in skb_tx_error()\n\nskb_tx_error() completes the zerocopy uarg and clears\nSKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears\nSKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone\nshares, while the caller only owns the reference it is about to drop.\nThrough a clone it tells the producer its pages are free and drops\nSKBFL_SHARED_FRAG for an skb that is still in flight.\n\nOpen vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC:\nclone_execute() sends a skb_clone() into ovs_dp_process_packet() while\ndo_execute_actions() keeps forwarding the original, and skb_clone()\ndoes not privatise the frags here -- skb_orphan_frags() returns early\non SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker\nfrom the packet still being forwarded, and a later local ESP delivery\ndecrypts in place over frags it does not own privately.\n\nSkip it for a cloned skb. Nothing is lost: skb_release_data() clears\nthe zerocopy state once the last reference to the shared data goes.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
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          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
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          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
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          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80977"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6493165034bca14033bf49c9cec7b45e97a91497"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b4452349dcf4d561e13be768d5d278de58248930"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/363c4252ffc473a0203e91b83ede5519dfb8bd07"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ec22afc82a3cae07ade0a6ec361ae2532128ff5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The buggy state is a locally originated MSG_ZEROCOPY/io_uring TX skb (SKBFL_DONT_ORPHAN plus a uarg); NIC-received packets never carry that marker, and the skb must still be forwarded into local ESP, so a local account is required.\nAC:L - The attacker fully controls both sides: OVS flows with a non-last RECIRC, a guaranteed miss/upcall failure on the clone, MSG_ZEROCOPY send, and the ESP SA/payload, so the shared-shinfo strip and in-place decrypt are reliably reproducible with no race beyond attacker influence.\nPR:L - An unprivileged user can enable SO_ZEROCOPY and, via unshare -Urn, obtain CAP_NET_ADMIN in a user+net namespace; OVS genetlink uses GENL_UNS_ADMIN_PERM and XFRM SAs are likewise namespace-installable, while the global page cache remains the corruption target.\nUI:N - The attacker installs the OVS recirc flow, sends the MSG_ZEROCOPY packet, and completes local ESP delivery without any victim action.\nS:U - The resulting page-cache write and premature zerocopy completion stay inside the host kernel's memory authority as a standard local memory-corruption/LPE primitive and do not cross a VM or IOMMU boundary.\nC:H - skb_tx_error() on the clone completes the shared uarg and clears SKBFL_SHARED_FRAG, so later in-place ESP decrypt (and UAF of still-mapped pages) corrupts globally cached file/code pages and can be leveraged for arbitrary disclosure.\nI:H - With the shared-frag marker stripped, esp_input() skips skb_cow_data() and AEAD-decrypts attacker-controlled plaintext in place over page-cache-backed frags, yielding an unprivileged write into files the sender could only read (the Fragnesia primitive).\nA:H - Use-after-free of zerocopy pages still referenced by the in-flight original skb, plus overwriting page-cache-backed executable or kernel-managed data, causes oopses, panics, and process crashes."
    }
  }
}