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CVE-2026-90015: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: xhci: fix lost bounce buffers on TDs spanning several ring segments When a TD reaches a link TRB with data that is not aligned to the endpoint's wMaxPacketSize, xhci_align_td() stages the unalignable tail through the bounce buffer of the ring segment holding that link TRB. xhci_unmap_td_bounce_buffer() later unmaps it and, for IN transfers, copies the data back into the URB's buffer. The enqueue path records the segment that was bounced in td->bounce_seg, under the assumption that a TD never spans more than two ring segments. That assumption does not hold: a TD large enough to span three or more segments crosses several link TRBs and can be bounced at each of them. Only the last one survives in td->bounce_seg, so every earlier bounce buffer is neither copied back nor DMA unmapped. The URB still completes with actual_length equal to the requested length and no error, so the transfer looks successful while a wMaxPacketSize sized hole in the destination buffer silently keeps its previous contents. It also leaks a DMA mapping per dropped bounce. Any sufficiently large and fragmented bulk transfer can hit this. It was found with a USB mass storage device behind xHCI backing a dm-verity target with 512 byte hash blocks, where the stale data is detected rather than silently consumed. The device enumerates as SuperSpeed, so wMaxPacketSize is 1024, while dm-bufio issues one 512 byte bio per hash block. verity_prefetch_io() makes the block layer merge hundreds of them into a single request of up to 512 scatterlist entries of 512 bytes each. At 256 TRBs per ring segment such a TD spans three segments, and every segment boundary falls on an odd multiple of 512, i.e. unaligned to wMaxPacketSize. dm-bufio then caches a hash block holding stale data and dm-verity declares the metadata block corrupted: device-mapper: verity: 8:2: metadata block 10850 is corrupted A reproducer running this under qemu is ava

    Засегнати продукти

    • Linux Linux: f9c589e142d04b8a19eb382162f804d17102b5ed преди c8124b28f12dbdd126118e63d0ebf8093a01fb81; f9c589e142d04b8a19eb382162f804d17102b5ed преди e04d5304a248e5d2a7f4faa87541644bdd320cfb; f9c589e142d04b8a19eb382162f804d17102b5ed преди a1629dfb011446d02905778f6df19f14c5f4f3b3; f9c589e142d04b8a19eb382162f804d17102b5ed преди 43239fc6dfb62c50ae1b9c0e82bac0f8cd2e285c; f9c589e142d04b8a19eb382162f804d17102b5ed преди 3c9a2b5a4f1183696f02ac280ced1d34afb409b1; f9c589e142d04b8a19eb382162f804d17102b5ed преди efaab8938fb92979be6df359f7d1a43fb7e4717d; f9c589e142d04b8a19eb382162f804d17102b5ed преди 7236bbd2cb7d9fc0eda896bbd34790341e2a4377; f9c589e142d04b8a19eb382162f804d17102b5ed преди ff44dfb03a293bf30e31f98772a1dd316a6071d1
    • Linux Linux: 4.8; преди 4.8; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.51 до 6.18.*; 7.2.5 до 7.2.*; от 7.3 нататък

    История

    • 16 септември 2026 Публикувано

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    CVE-2026-90015: Linux | freedomonline.bg