{"cve":{"cve_id":"CVE-2026-52942","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\nnetfilter: nf_log: validate MAC header was set before dumping it\n\nThe fallback path of dump_mac_header() guards the MAC header access\nonly with \"skb->mac_header != skb->network_header\", without checking\nskb_mac_header_was_set(). When the MAC header is unset, mac_header is\n0xffff, so the test passes and skb_mac_header(skb) returns\nskb->head + 0xffff, ~64 KiB past the buffer; the loop then reads\ndev->hard_header_len bytes out of bounds into the kernel log.\n\nThis is reachable via the netdev logger: nf_log_unknown_packet() calls\ndump_mac_header() unconditionally, and an skb sent through AF_PACKET\nwith PACKET_QDISC_BYPASS reaches the egress hook with mac_header still\nunset (__dev_queue_xmit(), which would reset it, is bypassed).\n\nAdd the skb_mac_header_was_set() check the ARPHRD_ETHER path already\nuses, and replace the open-coded MAC header length test with\nskb_mac_header_len(). Only skbs with an unset MAC header are affected;\nvalid ones are dumped as before.\n\n BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831)\n Read of size 1 at addr ffff88800ea49d3f by task exploit/148\n Call Trace:\n  kasan_report (mm/kasan/report.c:595)\n  dump_mac_header (net/netfilter/nf_log_syslog.c:831)\n  nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963)\n  nf_log_packet (net/netfilter/nf_log.c:260)\n  nft_log_eval (net/netfilter/nft_log.c:60)\n  nft_do_chain (net/netfilter/nf_tables_core.c:285)\n  nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307)\n  nf_hook_slow (net/netfilter/core.c:619)\n  nf_hook_direct_egress (net/packet/af_packet.c:257)\n  packet_xmit (net/packet/af_packet.c:280)\n  packet_sendmsg (net/packet/af_packet.c:3114)\n  __sys_sendto (net/socket.c:2265)","published_at":"2026-06-24T07:14:30.610000Z","last_modified_at":null,"cvss_v3_score":7.1,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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/d704ee9c7bc68a161684c51a7ac05b446dcf38d4","https://git.kernel.org/stable/c/befb8968a2abdfa948d5600ea7f7a509a292a590","https://git.kernel.org/stable/c/8a81e336da685423f5b64aac4d571e63d674c52a","https://git.kernel.org/stable/c/c38d41134085193efd5b237cf513ad5b3421a60d","https://git.kernel.org/stable/c/af1b7699466f6556b351fa25d3dc870abfb5d310","https://git.kernel.org/stable/c/65ef7397eb9a296e91839f5fd10be96f23d332e7","https://git.kernel.org/stable/c/a84b6fedbc97078788be78dbdd7517d143ad1a77"],"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":"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":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"d704ee9c7bc68a161684c51a7ac05b446dcf38d4","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:d704ee9c7bc68a161684c51a7ac05b446dcf38d4"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"befb8968a2abdfa948d5600ea7f7a509a292a590","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:befb8968a2abdfa948d5600ea7f7a509a292a590"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"8a81e336da685423f5b64aac4d571e63d674c52a","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:8a81e336da685423f5b64aac4d571e63d674c52a"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"c38d41134085193efd5b237cf513ad5b3421a60d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:c38d41134085193efd5b237cf513ad5b3421a60d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"af1b7699466f6556b351fa25d3dc870abfb5d310","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:af1b7699466f6556b351fa25d3dc870abfb5d310"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"65ef7397eb9a296e91839f5fd10be96f23d332e7","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:65ef7397eb9a296e91839f5fd10be96f23d332e7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","version_start_inclusive":true,"version_end":"a84b6fedbc97078788be78dbdd7517d143ad1a77","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:7eb9282cd0efac08b8377cbd5037ba297c77e3f7:a84b6fedbc97078788be78dbdd7517d143ad1a77"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"2.6.36","version_start_inclusive":true,"version_end":"2.6.36","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:2.6.36:2.6.36"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"2.6.36","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:2.6.36"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.15.210","version_start_inclusive":true,"version_end":"5.15.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.15.210:5.15.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.1.176","version_start_inclusive":true,"version_end":"6.1.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.1.176:6.1.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.143","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.143:6.6.*"},{"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/d704ee9c7bc68a161684c51a7ac05b446dcf38d4","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/befb8968a2abdfa948d5600ea7f7a509a292a590","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/8a81e336da685423f5b64aac4d571e63d674c52a","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/c38d41134085193efd5b237cf513ad5b3421a60d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/af1b7699466f6556b351fa25d3dc870abfb5d310","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/65ef7397eb9a296e91839f5fd10be96f23d332e7","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/a84b6fedbc97078788be78dbdd7517d143ad1a77","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T07:14:30.610000Z","label":"CVE published","source":null}]}