CVE-2026-80977 (GCVE-0-2026-80977)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:46
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: net: skbuff: don't touch shared zerocopy state in skb_tx_error() skb_tx_error() completes the zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears SKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone shares, while the caller only owns the reference it is about to drop. Through a clone it tells the producer its pages are free and drops SKBFL_SHARED_FRAG for an skb that is still in flight. Open vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC: clone_execute() sends a skb_clone() into ovs_dp_process_packet() while do_execute_actions() keeps forwarding the original, and skb_clone() does not privatise the frags here -- skb_orphan_frags() returns early on SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker from the packet still being forwarded, and a later local ESP delivery decrypts in place over frags it does not own privately. Skip it for a cloned skb. Nothing is lost: skb_release_data() clears the zerocopy state once the last reference to the shared data goes.
References
Impacted products
Vendor Product Version
Linux Linux Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
Version: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: don\u0027t 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."
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              "value": "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\u0027s 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."
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    "cveId": "CVE-2026-80977",
    "datePublished": "2026-09-11T19:42:38.862Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-10-19T08:46:01.788Z",
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"6493165034bca14033bf49c9cec7b45e97a91497\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"b4452349dcf4d561e13be768d5d278de58248930\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"363c4252ffc473a0203e91b83ede5519dfb8bd07\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"6ec22afc82a3cae07ade0a6ec361ae2532128ff5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"15aa81b390d401abf4b8211042470e9e92e3b7fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"288f9970670841044ab030104fa6b6ed159949d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"0370da114a9bc044e248b85c6809d1b5e0c1f7f9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"25121173f7b1e4ac3fc692df6e7b8c52ec36abba\", \"lessThan\": \"f66bdb1cc0fcd227a062378f8be0b5873aa5600a\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/skbuff.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.8\", \"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/core/skbuff.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/6493165034bca14033bf49c9cec7b45e97a91497\"}, {\"url\": \"https://git.kernel.org/stable/c/b4452349dcf4d561e13be768d5d278de58248930\"}, {\"url\": \"https://git.kernel.org/stable/c/363c4252ffc473a0203e91b83ede5519dfb8bd07\"}, {\"url\": \"https://git.kernel.org/stable/c/6ec22afc82a3cae07ade0a6ec361ae2532128ff5\"}, {\"url\": \"https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb\"}, {\"url\": \"https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0\"}, {\"url\": \"https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9\"}, {\"url\": \"https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: skbuff: don\u0027t 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"3.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"3.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:46:01.788Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80977\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:46:01.788Z\", \"dateReserved\": \"2026-08-26T14:34:25.811Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:42:38.862Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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