Към съдържанието
Търсене

CVE-2026-74256: Linux

8.4

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, без вход и без действие от потребителя.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check start and len are u32, so u64 last = start + len; evaluates start + len in 32-bit and wraps before storing it in last. The bounds check if (start >= offset + l || last > msg->sg.size) return -EINVAL; can then be passed with an out-of-range start/len, after which the pop loop runs off the end of the scatterlist and sk_msg_shift_left() calls put_page() on the empty msg->sg.end slot: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline] RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline] RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984 Call Trace: <TASK> bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8 bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746 sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934 tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline] tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583 __sock_sendmsg+0x153/0x1c0 net/socket.c:802 __sys_sendto+0x326/0x430 net/socket.c:2265 __x64_sys_sendto+0xe3/0x100 net/socket.c:2268 do_syscall_64+0x14c/0x480 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> Widen the addition with a (u64) cast so the bound is evaluated in 64-bit and a len near U32_MAX no longer wraps below msg->sg.size. While here, change pop from int to u32. It counts bytes against the unsigned scatterlist lengths and can never be negative, so the signed type only invites sign-confusion in the pop loop.

Засегнати продукти

  • Linux Linux: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди 9ef44ed6fb0c1db01cfcc3de432a33e719713eb5; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди ba5cc05dae8fce237d191c7ea96b1107a791e548; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди c05a0ec1cdced622a1a0c7d85679fe02f31033ec; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди 17eb9832a10db2f7a80cb429ca2bc5038445a943; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди fe09dd288722f1c749b7506c0b3e7841a7d85027; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди e09f7bd7273928b4089e6b71f8e992f2b356ca1b; 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 преди a48802fb2cd2d1e23651989f8ff4d15e9d5dad54
  • Linux Linux: 5.0; преди 5.0; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74256: Linux | freedomonline.bg