{"cve":{"cve_id":"CVE-2026-52959","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\nvirt: sev-guest: Do not use host-controlled page order in cleanup path\n\nWhen issuing an extended guest request (SVM_VMGEXIT_EXT_GUEST_REQUEST),\nget_ext_report() allocates a buffer to retrieve a certificate blob from the\nhost, keeping track of its size in report_req->certs_len.\n\nHowever, the host may return SNP_GUEST_VMM_ERR_INVALID_LEN, indicating\nan invalid buffer size, as well as the expected length of such buffer.\nget_ext_report() subsequently updates report_req->certs_len with the\nhost-controlled value, and cleans up the buffer by computing a page order\nfrom such value. This is incorrect, as the host-provided length may not\nmatch the page order of the original allocation, potentially resulting\nin corruption in the page allocator.\n\nFix this by using alloc_pages_exact() instead, and reusing @npages to\ncompute the size passed to free_pages_exact(). For consistency, also\nuse @npages to compute the size when allocating the pages, even though\nthis last change has no functional effect.","published_at":"2026-06-24T16:28:40.391000Z","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/3f6fb0211b39aaa1b841260681dd02ca6b693ed5","https://git.kernel.org/stable/c/9e48b4f813d2c3db75d522aa82ab705ce04b7e2d","https://git.kernel.org/stable/c/23e6a1ca04ae44806439a5a446e62e4d42e80bb4"],"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":"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":"3e385c0d6ce88ac9916dcf84267bd5855d830748","version_start_inclusive":true,"version_end":"3f6fb0211b39aaa1b841260681dd02ca6b693ed5","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:3e385c0d6ce88ac9916dcf84267bd5855d830748:3f6fb0211b39aaa1b841260681dd02ca6b693ed5"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"3e385c0d6ce88ac9916dcf84267bd5855d830748","version_start_inclusive":true,"version_end":"9e48b4f813d2c3db75d522aa82ab705ce04b7e2d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:3e385c0d6ce88ac9916dcf84267bd5855d830748:9e48b4f813d2c3db75d522aa82ab705ce04b7e2d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"3e385c0d6ce88ac9916dcf84267bd5855d830748","version_start_inclusive":true,"version_end":"23e6a1ca04ae44806439a5a446e62e4d42e80bb4","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:3e385c0d6ce88ac9916dcf84267bd5855d830748:23e6a1ca04ae44806439a5a446e62e4d42e80bb4"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0b16521f95c875e79d657cb8d6911c15080dbb80","version_start_inclusive":true,"version_end":"0b16521f95c875e79d657cb8d6911c15080dbb80","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:0b16521f95c875e79d657cb8d6911c15080dbb80:0b16521f95c875e79d657cb8d6911c15080dbb80"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.13.8","version_start_inclusive":true,"version_end":"6.14","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:6.13.8:6.14"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.14","version_start_inclusive":true,"version_end":"6.14","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.14:6.14"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.14","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.14"},{"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/3f6fb0211b39aaa1b841260681dd02ca6b693ed5","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/9e48b4f813d2c3db75d522aa82ab705ce04b7e2d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/23e6a1ca04ae44806439a5a446e62e4d42e80bb4","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T16:28:40.391000Z","label":"CVE published","source":null}]}