{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"2e96e1bc9b4d5450e6c33f078e19a9bc1dda6c0b","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"d704ee9c7bc68a161684c51a7ac05b446dcf38d4","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"befb8968a2abdfa948d5600ea7f7a509a292a590","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"8a81e336da685423f5b64aac4d571e63d674c52a","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"c38d41134085193efd5b237cf513ad5b3421a60d","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"af1b7699466f6556b351fa25d3dc870abfb5d310","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"65ef7397eb9a296e91839f5fd10be96f23d332e7","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"},{"lessThan":"a84b6fedbc97078788be78dbdd7517d143ad1a77","status":"affected","version":"7eb9282cd0efac08b8377cbd5037ba297c77e3f7","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"2.6.36"},{"lessThan":"2.6.36","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"0","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]}],"cveId":"CVE-2026-52942","cwes":["CWE-125"],"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)","epss":{"date":"2026-11-09","percentile":0.02757,"score":0.00132},"exploits":[],"kev":null,"metrics":[{"score":7.1,"severity":"high","source":"CNA: Linux","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}],"modifiedAt":1794314866945,"publishedAt":1782285270610,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/2e96e1bc9b4d5450e6c33f078e19a9bc1dda6c0b"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/d704ee9c7bc68a161684c51a7ac05b446dcf38d4"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/befb8968a2abdfa948d5600ea7f7a509a292a590"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/8a81e336da685423f5b64aac4d571e63d674c52a"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/c38d41134085193efd5b237cf513ad5b3421a60d"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/af1b7699466f6556b351fa25d3dc870abfb5d310"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/65ef7397eb9a296e91839f5fd10be96f23d332e7"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/a84b6fedbc97078788be78dbdd7517d143ad1a77"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}],"remediation":[],"revision":"90270354798545bcae12698bc1f55eed2a8cbf9b059fbb21ac5ec78596504721","sources":[{"modifiedAt":1794314866945,"name":"CNA: Linux","retrievedAt":1794316671220,"url":"https://www.cve.org/CVERecord?id=CVE-2026-52942"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794316683878,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-52942"}],"ssvc":{"assessedAt":1792164184866,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"netfilter: nf_log: validate MAC header was set before dumping it","updatedAt":1794316683878}