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CVE-2026-80977 (GCVE-0-2026-80977)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
VLAI
Title
net: skbuff: don't touch shared zerocopy state in skb_tx_error()
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.
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: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < 6493165034bca14033bf49c9cec7b45e97a91497 (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < b4452349dcf4d561e13be768d5d278de58248930 (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < 363c4252ffc473a0203e91b83ede5519dfb8bd07 (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < 6ec22afc82a3cae07ade0a6ec361ae2532128ff5 (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < 15aa81b390d401abf4b8211042470e9e92e3b7fb (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < 288f9970670841044ab030104fa6b6ed159949d0 (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < 0370da114a9bc044e248b85c6809d1b5e0c1f7f9 (git)
Affected: 25121173f7b1e4ac3fc692df6e7b8c52ec36abba , < f66bdb1cc0fcd227a062378f8be0b5873aa5600a (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (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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{
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          "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."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a"
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      ],
      "title": "net: skbuff: don\u0027t touch shared zerocopy state in skb_tx_error()",
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    "cveId": "CVE-2026-80977",
    "datePublished": "2026-09-11T19:42:38.862Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-09-14T11:59:22.460Z",
    "state": "PUBLISHED"
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      "date": "2026-09-17",
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      "cve": "CVE-2026-80977",
      "id": "msrc_CVE-2026-80977",
      "initial_release_date": "2026-09-13T01:10:31.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: skbuff: don\u0027t touch shared zerocopy state in skb_tx_error()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80977.json",
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            "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."
          }
        ],
        "id": "CVE-2026-80977",
        "lastModified": "2026-09-14T13:18:52.487",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:04.013",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/363c4252ffc473a0203e91b83ede5519dfb8bd07"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6493165034bca14033bf49c9cec7b45e97a91497"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6ec22afc82a3cae07ade0a6ec361ae2532128ff5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b4452349dcf4d561e13be768d5d278de58248930"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T18:58:21+00:00",
      "cve": "CVE-2026-80977",
      "id": "CVE-2026-80977",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: skbuff: don\u0027t touch shared zerocopy state in skb_tx_error()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80977.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:04:57Z",
      "cve": "CVE-2026-80977",
      "id": "CVE-2026-80977",
      "initial_release_date": "2026-09-12T16:36:26Z",
      "product_status:known_affected": "334",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80977",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80977.json",
      "version": "3"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.