{"cve":{"cve_id":"CVE-2026-53250","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\nxsk: cache csum_start/csum_offset to fix TOCTOU in xsk_skb_metadata()\n\nThe TX metadata area resides in the UMEM buffer which is memory-mapped\nand concurrently writable by userspace. In xsk_skb_metadata(),\ncsum_start and csum_offset are read from shared memory for bounds\nvalidation, then read again for skb assignment. A malicious userspace\napplication can race to overwrite these values between the two reads,\nbypassing the bounds check and causing out-of-bounds memory access\nduring checksum computation in the transmit path.\n\nFix this by reading csum_start and csum_offset into local variables\nonce, then using the local copies for both validation and assignment.\n\nNote that other metadata fields (flags, launch_time) and the cached\ncsum fields may be mutually inconsistent due to concurrent userspace\nwrites, but this is benign: the only security-critical invariant is\nthat each field's validated value is the same one used, which local\ncaching guarantees.","published_at":"2026-06-25T08:39:42.630000Z","last_modified_at":null,"cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","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/0dfe05b938435892875e07771170051346412df9","https://git.kernel.org/stable/c/bfdfd2706d5fb2cd496a1506e680daf979309c8b","https://git.kernel.org/stable/c/22ba97ea9cc1f63a0d0244fae38057ed452b6ac7"],"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":"2026-06-28T17:55:28.590503Z","updated_at":"2026-06-28T23:30:51.545322Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"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":"48eb03dd26304c24f03bdbb9382e89c8564e71df","version_start_inclusive":true,"version_end":"0dfe05b938435892875e07771170051346412df9","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:48eb03dd26304c24f03bdbb9382e89c8564e71df:0dfe05b938435892875e07771170051346412df9"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"48eb03dd26304c24f03bdbb9382e89c8564e71df","version_start_inclusive":true,"version_end":"bfdfd2706d5fb2cd496a1506e680daf979309c8b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:48eb03dd26304c24f03bdbb9382e89c8564e71df:bfdfd2706d5fb2cd496a1506e680daf979309c8b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"48eb03dd26304c24f03bdbb9382e89c8564e71df","version_start_inclusive":true,"version_end":"22ba97ea9cc1f63a0d0244fae38057ed452b6ac7","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:48eb03dd26304c24f03bdbb9382e89c8564e71df:22ba97ea9cc1f63a0d0244fae38057ed452b6ac7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.8","version_start_inclusive":true,"version_end":"6.8","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.8:6.8"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.8","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.8"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.36","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.36:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.13","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.13:7.0.*"},{"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/0dfe05b938435892875e07771170051346412df9","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/bfdfd2706d5fb2cd496a1506e680daf979309c8b","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/22ba97ea9cc1f63a0d0244fae38057ed452b6ac7","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-25T08:39:42.630000Z","label":"CVE published","source":null}]}