{"cve":{"cve_id":"CVE-2026-52993","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix double-free in tipc_buf_append()\n\ntipc_msg_validate() can potentially reallocate the skb it is validating,\nfreeing the old one.  In tipc_buf_append(), it was being called with a\npointer to a local variable which was a copy of the caller's skb\npointer.\n\nIf the skb was reallocated and validation subsequently failed, the error\nhandling path would free the original skb pointer, which had already\nbeen freed, leading to double-free.\n\nFix this by checking if head now points to a newly allocated reassembled\nskb.  If it does, reassign *headbuf for later freeing operations.","published_at":"2026-06-24T16:29:06.475000Z","last_modified_at":null,"cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b","https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24","https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9","https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6","https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3","https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778","https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:22.518073Z","updated_at":"2026-06-28T23:30:49.890169Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"a438975a6dcdbd70865978c021650d1485586f0b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:a438975a6dcdbd70865978c021650d1485586f0b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:4ee4deadaae7cb2e3d53af0fc889cf92a73413c0"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"d3556656c6daebf8def751c7e71d11dd0a180d24","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:d3556656c6daebf8def751c7e71d11dd0a180d24"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"0274f24485fc38032d4093e463dc3ff5c7a667c9","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:0274f24485fc38032d4093e463dc3ff5c7a667c9"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"4d104882bc815d4ec666ace9155f5f52715879a6","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:4d104882bc815d4ec666ace9155f5f52715879a6"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"1d5e589055880fae229e229e1929e087dbe08cf3","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:1d5e589055880fae229e229e1929e087dbe08cf3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"29940fff14110ca48c5ccc168d121665b51bb778","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:29940fff14110ca48c5ccc168d121665b51bb778"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"d618d09a68e4eed7a435beb2e355250f6f40664a","version_start_inclusive":true,"version_end":"d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:d618d09a68e4eed7a435beb2e355250f6f40664a:d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"4.15","version_start_inclusive":true,"version_end":"4.15","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:4.15:4.15"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"4.15","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:4.15"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.10.258","version_start_inclusive":true,"version_end":"5.10.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.10.258:5.10.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.15.209","version_start_inclusive":true,"version_end":"5.15.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.15.209:5.15.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.1.175","version_start_inclusive":true,"version_end":"6.1.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.1.175:6.1.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.141","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.141:6.6.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.91","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.91:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.33","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.33:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.10","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.10:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T16:29:06.475000Z","label":"CVE published","source":null}]}