[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2026-52942":6},{"stargazers_count":4,"fetched_at":5},8,"2026-09-19T04:32:17.889Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":17,"related":18,"reserved_at":9,"published_at":19,"modified_at":20,"state":9,"summary":21,"references_raw":23,"kevs":30,"epss":9,"epss_history":31,"metrics":32,"affected":39},"DEBIAN-CVE-2026-52942","In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_log: validate MAC header was set before dumping it  The fallback path of dump_mac_header() guards the MAC header access only with \"skb->mac_header != skb->network_header\", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log.  This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed).  Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before.   BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831)  Read of size 1 at addr ffff88800ea49d3f by task exploit/148  Call Trace:   kasan_report (mm/kasan/report.c:595)   dump_mac_header (net/netfilter/nf_log_syslog.c:831)   nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963)   nf_log_packet (net/netfilter/nf_log.c:260)   nft_log_eval (net/netfilter/nft_log.c:60)   nft_do_chain (net/netfilter/nf_tables_core.c:285)   nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307)   nf_hook_slow (net/netfilter/core.c:619)   nf_hook_direct_egress (net/packet/af_packet.c:257)   packet_xmit (net/packet/af_packet.c:280)   packet_sendmsg (net/packet/af_packet.c:3114)   __sys_sendto (net/socket.c:2265)",null,[],[],[],[14],{"_key":15},"CVE-2026-52942",[],[],[],"2026-06-24T08:16:24.490Z","2026-07-05T20:01:02.727652060Z",{"cisa_kev":22,"cisa_ransomware":22,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[24],{"url":25,"sources":26,"tags":28},"https://security-tracker.debian.org/tracker/CVE-2026-52942",[27],"osv_debian",[29],"Advisory",[],[],[33],{"source":27,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":34,"cvss_v4_0":9},{"baseScore":35,"baseSeverity":9,"vectorString":36,"impactScore":37,"exploitabilityScore":38},7.1,"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",8.7,4.6,[40,62],{"ecosystem":41,"name":42,"vendor":43,"product":42,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":42,"source":9,"versions":45},"Debian","linux","debian","deb",[46,50,51,52,56,59],{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":9,"version_end_type":9,"fixed_in":9},"all",true,"ecosystem",{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":9,"version_end_type":9,"fixed_in":9},{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":9,"version_end_type":9,"fixed_in":9},{"version":53,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":55,"fixed_in":9},"lt6_1_176_1","6.1.176-1","excluding",{"version":57,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":58,"version_end_type":55,"fixed_in":9},"lt6_12_94_1","6.12.94-1",{"version":60,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":61,"version_end_type":55,"fixed_in":9},"lt7_0_13_1","7.0.13-1",{"ecosystem":41,"name":63,"vendor":43,"product":63,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":63,"source":9,"versions":64},"linux-6.1",[65],{"version":66,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":67,"version_end_type":55,"fixed_in":9},"lt6_1_176_1~deb11u1","6.1.176-1~deb11u1"]