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CVE-2026-52942: Linux, грешка в паметта

7.1

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

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)

Засегнати продукти

  • Linux Linux: 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди 2e96e1bc9b4d5450e6c33f078e19a9bc1dda6c0b; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди d704ee9c7bc68a161684c51a7ac05b446dcf38d4; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди befb8968a2abdfa948d5600ea7f7a509a292a590; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди 8a81e336da685423f5b64aac4d571e63d674c52a; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди c38d41134085193efd5b237cf513ad5b3421a60d; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди af1b7699466f6556b351fa25d3dc870abfb5d310; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди 65ef7397eb9a296e91839f5fd10be96f23d332e7; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 преди a84b6fedbc97078788be78dbdd7517d143ad1a77
  • Linux Linux: 2.6.36; преди 2.6.36; 5.10.261 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.143 до 6.6.*; 6.12.94 до 6.12.*; 6.18.36 до 6.18.*; 7.0.13 до 7.0.*; от 7.1 нататък
  • Siemens: още 4 продукта, добавени от Siemens

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Вид слабост

История

  • 24 юни 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-52942: Linux, грешка в паметта | freedomonline.bg