{"cve":{"cve_id":"CVE-2026-53003","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\npppoe: drop PFC frames\n\nRFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT\nRECOMMENDED for PPPoE. In practice, pppd does not support negotiating\nPFC for PPPoE sessions, and the current PPPoE driver assumes an\nuncompressed (2-byte) protocol field. However, the generic PPP layer\nfunction ppp_input() is not aware of the negotiation result, and still\naccepts PFC frames.\n\nIf a peer with a broken implementation or an attacker sends a frame with\na compressed (1-byte) protocol field, the subsequent PPP payload is\nshifted by one byte. This causes the network header to be 4-byte\nmisaligned, which may trigger unaligned access exceptions on some\narchitectures.\n\nTo reduce the attack surface, drop PPPoE PFC frames. Introduce\nppp_skb_is_compressed_proto() helper function to be used in both\nppp_generic.c and pppoe.c to avoid open-coding.","published_at":"2026-06-24T16:29:15.268000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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/cb3beef35ab5e0c1afca9fd7648c6ae499786377","https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2","https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3","https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6","https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71","https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f","https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e","https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679"],"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":"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":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"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":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"cb3beef35ab5e0c1afca9fd7648c6ae499786377","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:cb3beef35ab5e0c1afca9fd7648c6ae499786377"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"ba758fdf1399f310b30098b6faa3fd043de47dd2","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:ba758fdf1399f310b30098b6faa3fd043de47dd2"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"fcca1df05322bb04e344dd1178b54b76a08eb7c3","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:fcca1df05322bb04e344dd1178b54b76a08eb7c3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"8a5e840babc5c0fbd10c73728a13192347771ec6","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:8a5e840babc5c0fbd10c73728a13192347771ec6"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"0cab5d077dd1efd2bd1a47271acc35894f945b4f","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:0cab5d077dd1efd2bd1a47271acc35894f945b4f"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"2b5c3c040d020e3ab3b9a8887031202d96843b1e","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:2b5c3c040d020e3ab3b9a8887031202d96843b1e"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6","version_start_inclusive":true,"version_end":"cc1ff87bce1ccd38410ab10960f576dcd17db679","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6:cc1ff87bce1ccd38410ab10960f576dcd17db679"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.0","version_start_inclusive":true,"version_end":"5.0","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.0:5.0"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"5.0","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:5.0"},{"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/cb3beef35ab5e0c1afca9fd7648c6ae499786377","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T16:29:15.268000Z","label":"CVE published","source":null}]}