{"cve":{"cve_id":"CVE-2026-53191","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\nio_uring/net: inherit IORING_CQE_F_BUF_MORE across bundle recv retries\n\nWhen a bundle recv retries inside io_recv_finish(), the merge logic OR\nthe saved cflags from the previous iteration with the cflags returned by\nthe new iteration:\n  cflags = req->cqe.flags | (cflags & CQE_F_MASK);\n\nBits listed in CQE_F_MASK are inherited from the new iteration, and all\nother bits (notably IORING_CQE_F_BUFFER and the buffer ID) come from the\nsaved cflags. Before this change CQE_F_MASK covered only\nIORING_CQE_F_SOCK_NONEMPTY and IORING_CQE_F_MORE.\n\nWhen using provided buffer rings (IOU_PBUF_RING_INC) with incremental\nmode, and bundle recv, io_kbuf_inc_commit() can leave the head ring\nentry partially consumed, __io_put_kbufs() then sets\nIORING_CQE_F_BUF_MORE on the returned cflags so userspace knows the\nbuffer ID will be reused for subsequent completions.\n\nBecause IORING_CQE_F_BUF_MORE was not in CQE_F_MASK, the merge above\nsilently dropped it whenever the final retry iteration partially\nconsumed the buffer, and the subsequent req->cqe.flags = cflags &\n~CQE_F_MASK save would have left a stale IORING_CQE_F_BUF_MORE in the\ncarried-over cflags had one been present. Userspace would then\nwrongfully advance it ring head past an entry the kernel still uses.\n\nAdd IORING_CQE_F_BUF_MORE to CQE_F_MASK so it is both inherited from the\nnew iteration into the user-visible CQE and stripped from the saved\ncflags between iterations.","published_at":"2026-06-25T08:39:03.052000Z","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/f40570fda3f3a1f96aeaa4aef665ba274b2810b5","https://git.kernel.org/stable/c/0bbc9481f970b0b4ddb08cfa464db1cc93b74b56","https://git.kernel.org/stable/c/4973232a67e4137ab9399f504f7f2bdd847f96d2","https://git.kernel.org/stable/c/ed46f39c47eb5530a9c161481a2080d3a869cfaf"],"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":"ae98dbf43d755b4e111fcd086e53939bef3e9a1a","version_start_inclusive":true,"version_end":"f40570fda3f3a1f96aeaa4aef665ba274b2810b5","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ae98dbf43d755b4e111fcd086e53939bef3e9a1a:f40570fda3f3a1f96aeaa4aef665ba274b2810b5"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ae98dbf43d755b4e111fcd086e53939bef3e9a1a","version_start_inclusive":true,"version_end":"0bbc9481f970b0b4ddb08cfa464db1cc93b74b56","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ae98dbf43d755b4e111fcd086e53939bef3e9a1a:0bbc9481f970b0b4ddb08cfa464db1cc93b74b56"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ae98dbf43d755b4e111fcd086e53939bef3e9a1a","version_start_inclusive":true,"version_end":"4973232a67e4137ab9399f504f7f2bdd847f96d2","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ae98dbf43d755b4e111fcd086e53939bef3e9a1a:4973232a67e4137ab9399f504f7f2bdd847f96d2"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"ae98dbf43d755b4e111fcd086e53939bef3e9a1a","version_start_inclusive":true,"version_end":"ed46f39c47eb5530a9c161481a2080d3a869cfaf","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:ae98dbf43d755b4e111fcd086e53939bef3e9a1a:ed46f39c47eb5530a9c161481a2080d3a869cfaf"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12","version_start_inclusive":true,"version_end":"6.12","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12:6.12"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.12","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.12"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.94","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.94:6.12.*"},{"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/f40570fda3f3a1f96aeaa4aef665ba274b2810b5","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/0bbc9481f970b0b4ddb08cfa464db1cc93b74b56","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/4973232a67e4137ab9399f504f7f2bdd847f96d2","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/ed46f39c47eb5530a9c161481a2080d3a869cfaf","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-25T08:39:03.052000Z","label":"CVE published","source":null}]}