CVE-2026-80977

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80977", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.811Z", "datePublished": "2026-09-11T19:42:38.862Z", "dateUpdated": "2026-10-19T08:46:01.788Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:01.788Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "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'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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/skbuff.c"], "versions": [{"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "6493165034bca14033bf49c9cec7b45e97a91497", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "b4452349dcf4d561e13be768d5d278de58248930", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "363c4252ffc473a0203e91b83ede5519dfb8bd07", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "6ec22afc82a3cae07ade0a6ec361ae2532128ff5", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "15aa81b390d401abf4b8211042470e9e92e3b7fb", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "288f9970670841044ab030104fa6b6ed159949d0", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "0370da114a9bc044e248b85c6809d1b5e0c1f7f9", "status": "affected", "versionType": "git"}, {"version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "lessThan": "f66bdb1cc0fcd227a062378f8be0b5873aa5600a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/skbuff.c"], "versions": [{"version": "3.8", "status": "affected"}, {"version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.3"}]}]}], "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"}], "title": "net: skbuff: don't touch shared zerocopy state in skb_tx_error()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-80977", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:21:39.834701Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:37.069Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-80977", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:21:39.834701Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:21:41.071Z"}}], "cna": {"title": "net: skbuff: don't touch shared zerocopy state in skb_tx_error()", "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 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."}]}], "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'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."}], "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"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/skbuff.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6493165034bca14033bf49c9cec7b45e97a91497", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "b4452349dcf4d561e13be768d5d278de58248930", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "363c4252ffc473a0203e91b83ede5519dfb8bd07", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "6ec22afc82a3cae07ade0a6ec361ae2532128ff5", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "15aa81b390d401abf4b8211042470e9e92e3b7fb", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "288f9970670841044ab030104fa6b6ed159949d0", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "0370da114a9bc044e248b85c6809d1b5e0c1f7f9", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}, {"lessThan": "f66bdb1cc0fcd227a062378f8be0b5873aa5600a", "status": "affected", "version": "25121173f7b1e4ac3fc692df6e7b8c52ec36abba", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/skbuff.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.8"}, {"lessThan": "3.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-80977", "lastModified": "2026-10-19T09:17:29.830", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80977", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:21:39.834701Z", "version": "2.0.3"}}]}, "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", "url": "https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0"}, {"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"}

{"bugzilla": {"description": "kernel: Linux kernel: Information disclosure in network stack due to improper zerocopy state management", "id": "2532197", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532197"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["A flaw was found in the Linux kernel's networking subsystem. The `skb_tx_error()` function improperly handles shared zerocopy state in socket buffers (skbs). When a cloned skb is processed, it can prematurely signal that its pages are free and drop shared fragment flags while the original skb is still in use. This can lead to a scenario where a local ESP (Encapsulating Security Payload) delivery decrypts data into memory fragments that it does not privately own, potentially resulting in information disclosure."], "name": "CVE-2026-80977", "public_date": "2026-09-11T19:42:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80977\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80977\nhttps://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9\nhttps://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb\nhttps://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0\nhttps://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[25121173f7b1e4ac3fc692df6e7b8c52ec36abba,15aa81b390d401abf4b8211042470e9e92e3b7fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[25121173f7b1e4ac3fc692df6e7b8c52ec36abba,288f9970670841044ab030104fa6b6ed159949d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[25121173f7b1e4ac3fc692df6e7b8c52ec36abba,0370da114a9bc044e248b85c6809d1b5e0c1f7f9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[25121173f7b1e4ac3fc692df6e7b8c52ec36abba,f66bdb1cc0fcd227a062378f8be0b5873aa5600a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T02:15:06.471091+00:00", "updated": "2026-09-21T02:30:08.198325+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}