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CVE-2026-43465: Linux

9.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

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Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ XDP multi-buf programs can modify the layout of the XDP buffer when the program calls bpf_xdp_pull_data() or bpf_xdp_adjust_tail(). The referenced commit in the fixes tag corrected the assumption in the mlx5 driver that the XDP buffer layout doesn't change during a program execution. However, this fix introduced another issue: the dropped fragments still need to be counted on the driver side to avoid page fragment reference counting issues. The issue was discovered by the drivers/net/xdp.py selftest, more specifically the test_xdp_native_tx_mb: - The mlx5 driver allocates a page_pool page and initializes it with a frag counter of 64 (pp_ref_count=64) and the internal frag counter to 0. - The test sends one packet with no payload. - On RX (mlx5e_skb_from_cqe_mpwrq_nonlinear()), mlx5 configures the XDP buffer with the packet data starting in the first fragment which is the page mentioned above. - The XDP program runs and calls bpf_xdp_pull_data() which moves the header into the linear part of the XDP buffer. As the packet doesn't contain more data, the program drops the tail fragment since it no longer contains any payload (pp_ref_count=63). - mlx5 device skips counting this fragment. Internal frag counter remains 0. - mlx5 releases all 64 fragments of the page but page pp_ref_count is 63 => negative reference counting error. Resulting splat during the test: WARNING: CPU: 0 PID: 188225 at ./include/net/page_pool/helpers.h:297 mlx5e_page_release_fragmented.isra.0+0xbd/0xe0 [mlx5_core] Modules linked in: [...] CPU: 0 UID: 0 PID: 188225 Comm: ip Not tainted 6.18.0-rc7_for_upstream_min_debug_2025_12_08_11_44 #1 NONE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:mlx5e_page_release_fragmented.isra.0+0xbd/0xe0 [mlx5_core] [...] Call T

    Засегнати продукти

    • Linux Linux: 8b051d7f530e8a5237da242fbeafef02fec6b813 преди 6451ea47d60a8ca3524dfe370c013cd01063c7d3; cb9edd583e23979ee546981be963ad5f217e8b18 преди f0a850677a7b7589208ce11480e6958f516c8386; 87bcef158ac1faca1bd7e0104588e8e2956d10be преди 7d7342a18fadcdb70a63b3c930dc63528ce51832; 87bcef158ac1faca1bd7e0104588e8e2956d10be преди 043bd62f748bc9fd98154037aa598cffbd3c667c; 87bcef158ac1faca1bd7e0104588e8e2956d10be преди db25c42c2e1f9c0d136420fff5e5700f7e771a6f; f2557d7fa38e9475b38588f5c124476091480f53; 6.6.115 преди 6.6.160; 6.12.56 преди 6.12.114; 6.17.6 преди 6.18
    • Linux Linux: 6.18; преди 6.18; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.19 до 6.18.*; 6.19.9 до 6.19.*; 7.0 до *

    История

    • 8 май 2026 Публикувано

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    Първоизточници

    CVE-2026-43465: Linux | freedomonline.bg