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CVE-2026-23383: Linux

7.8

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.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearing struct bpf_plt contains a u64 target field. Currently, the BPF JIT allocator requests an alignment of 4 bytes (sizeof(u32)) for the JIT buffer. Because the base address of the JIT buffer can be 4-byte aligned (e.g., ending in 0x4 or 0xc), the relative padding logic in build_plt() fails to ensure that target lands on an 8-byte boundary. This leads to two issues: 1. UBSAN reports misaligned-access warnings when dereferencing the structure. 2. More critically, target is updated concurrently via WRITE_ONCE() in bpf_arch_text_poke() while the JIT'd code executes ldr. On arm64, 64-bit loads/stores are only guaranteed to be single-copy atomic if they are 64-bit aligned. A misaligned target risks a torn read, causing the JIT to jump to a corrupted address. Fix this by increasing the allocation alignment requirement to 8 bytes (sizeof(u64)) in bpf_jit_binary_pack_alloc(). This anchors the base of the JIT buffer to an 8-byte boundary, allowing the relative padding math in build_plt() to correctly align the target field.

    Засегнати продукти

    • Linux Linux: b2ad54e1533e91449cb2a371e034942bd7882b58 преди fcb9c6275f712860c22c96a472b73d05cabb75cd; b2ad54e1533e91449cb2a371e034942bd7882b58 преди f5a41b61b5faae1965a5a2cb55322fe8f17e3b2d; b2ad54e1533e91449cb2a371e034942bd7882b58 преди 80ad264da02cc4aee718e799c2b79f0f834673dc; b2ad54e1533e91449cb2a371e034942bd7882b58 преди 519b1ad91de5bf7a496f2b858e9212db6328e1de; b2ad54e1533e91449cb2a371e034942bd7882b58 преди 66959ed481a474eaae278c7f6860a2a9b188a4d6; b2ad54e1533e91449cb2a371e034942bd7882b58 преди ef06fd16d48704eac868441d98d4ef083d8f3d07
    • Linux Linux: 6.0; преди 6.0; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.77 до 6.12.*; 6.18.17 до 6.18.*; 6.19.7 до 6.19.*; от 7.0 нататък

    История

    • 25 март 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-23383: Linux | freedomonline.bg