CVE ID :CVE-2026-52942<\/p>\n
Published : June 24, 2026, 7:14 a.m. | 2\u00a0hours, 29\u00a0minutes ago<\/p>\n
Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: nf_log: validate MAC header was set before dumping it<\/p>\n
The 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.<\/p>\n
This 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).<\/p>\n
Add 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.<\/p>\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)<\/p>\n
Severity: 0.0 | NA<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID :CVE-2026-52942 Published : June 24, 2026, 7:14 a.m. | 2\u00a0hours, 29\u00a0minutes ago Description :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 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-81001","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81001","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=81001"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81001\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=81001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=81001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=81001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}