{"id":"CVE-2026-89487","revision":"cf7a56a9ba7d47de88246b71fa6a0f93","records":[{"revision":"cf7a56a9ba7d47de88246b71fa6a0f93","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89487","aliases":[],"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":0,"publishedAt":"2026-09-11T19:43:40.776+00:00","modifiedAt":"2026-10-19T08:47:37.837+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/openvswitch/datapath.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"48db11e115d1b232edc5591604adc6eda95cd545\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"4477222e2916a18e273edc139c955ade6bbb7a69\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"4d5c460ef8754be1d43b16dbf02695b008b207d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"6767d70cf46f65807a6a4c4406a518e6c12e36ae\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"e41a59fc056f63a7a1f42788913c53cc48d744aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"5d85eef222cfd28e73deed7402c100229e8b9e6e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"36d5fe6a000790f56039afe26834265db0a3ad4c\",\n                            \"lessThan\": \"0dbc2398fca3bb33eda963849f865ddb1b3aa05e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5f0c0e7525443add533495e93ba8de6feab2396\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1674b4bf3eea3cac51b70778e89f8025f7cfe695\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.10.51\",\n                            \"lessThan\": \"3.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.12.40\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/openvswitch/datapath.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a","https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545","https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69","https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6","https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae","https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa","https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e","https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89487","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89487","identifiers":["CVE-2026-89487"]},"retained":false,"historicalAffected":[]}],"coverage":[]}