{"api_version":"1","generated_at":"2026-09-11T22:59:41+00:00","cve":"CVE-2026-89487","urls":{"html":"https://cve.report/CVE-2026-89487","api":"https://cve.report/api/cve/CVE-2026-89487.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89487","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89487"},"summary":{"title":"openvswitch: only skb_tx_error() a packet we are about to drop","description":"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's remaining\nactions. Its error path nevertheless calls skb_tx_error(skb), which via\nskb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY,\nstripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s 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()'s 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()'s 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:30","updated_at":"2026-09-11 20:19:30"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae","name":"https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e","name":"https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e","name":"https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa","name":"https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89487","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89487","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36d5fe6a000790f56039afe26834265db0a3ad4c 6767d70cf46f65807a6a4c4406a518e6c12e36ae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36d5fe6a000790f56039afe26834265db0a3ad4c e41a59fc056f63a7a1f42788913c53cc48d744aa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36d5fe6a000790f56039afe26834265db0a3ad4c 5d85eef222cfd28e73deed7402c100229e8b9e6e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 36d5fe6a000790f56039afe26834265db0a3ad4c 0dbc2398fca3bb33eda963849f865ddb1b3aa05e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c5f0c0e7525443add533495e93ba8de6feab2396 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1674b4bf3eea3cac51b70778e89f8025f7cfe695 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.10.51 3.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.12.40 3.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/openvswitch/datapath.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6767d70cf46f65807a6a4c4406a518e6c12e36ae","status":"affected","version":"36d5fe6a000790f56039afe26834265db0a3ad4c","versionType":"git"},{"lessThan":"e41a59fc056f63a7a1f42788913c53cc48d744aa","status":"affected","version":"36d5fe6a000790f56039afe26834265db0a3ad4c","versionType":"git"},{"lessThan":"5d85eef222cfd28e73deed7402c100229e8b9e6e","status":"affected","version":"36d5fe6a000790f56039afe26834265db0a3ad4c","versionType":"git"},{"lessThan":"0dbc2398fca3bb33eda963849f865ddb1b3aa05e","status":"affected","version":"36d5fe6a000790f56039afe26834265db0a3ad4c","versionType":"git"},{"status":"affected","version":"c5f0c0e7525443add533495e93ba8de6feab2396","versionType":"git"},{"status":"affected","version":"1674b4bf3eea3cac51b70778e89f8025f7cfe695","versionType":"git"},{"lessThan":"3.11","status":"affected","version":"3.10.51","versionType":"semver"},{"lessThan":"3.13","status":"affected","version":"3.12.40","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/openvswitch/datapath.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.14"},{"lessThan":"3.14","status":"unaffected","version":"0","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-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10.51","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12.40","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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's remaining\nactions. Its error path nevertheless calls skb_tx_error(skb), which via\nskb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY,\nstripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s 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()'s 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()'s 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."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:40.776Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae"},{"url":"https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa"},{"url":"https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e"},{"url":"https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e"}],"title":"openvswitch: only skb_tx_error() a packet we are about to drop","x_generator":{"engine":"bippy-1.2.0"}}},"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":"2026-09-11T19:43:40.776Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:30","lastModifiedDate":"2026-09-11 20:19:30","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89487","Ordinal":"1","Title":"openvswitch: only skb_tx_error() a packet we are about to drop","CVE":"CVE-2026-89487","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89487","Ordinal":"1","NoteData":"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's remaining\nactions. Its error path nevertheless calls skb_tx_error(skb), which via\nskb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY,\nstripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s 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()'s 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()'s 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.","Type":"Description","Title":"openvswitch: only skb_tx_error() a packet we are about to drop"}]}}}