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CVE-2026-46066: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    In the Linux kernel, the following vulnerability has been resolved: ceph: fix num_ops off-by-one when crypto allocation fails move_dirty_folio_in_page_array() may fail if the file is encrypted, the dirty folio is not the first in the batch, and it fails to allocate a bounce buffer to hold the ciphertext. When that happens, ceph_process_folio_batch() simply redirties the folio and flushes the current batch -- it can retry that folio in a future batch. However, if this failed folio is not contiguous with the last folio that did make it into the batch, then ceph_process_folio_batch() has already incremented `ceph_wbc->num_ops`; because it doesn't follow through and add the discontiguous folio to the array, ceph_submit_write() -- which expects that `ceph_wbc->num_ops` accurately reflects the number of contiguous ranges (and therefore the required number of "write extent" ops) in the writeback -- will panic the kernel: BUG_ON(ceph_wbc->op_idx + 1 != req->r_num_ops); This issue can be reproduced on affected kernels by writing to fscrypt-enabled CephFS file(s) with a 4KiB-written/4KiB-skipped/repeat pattern (total filesize should not matter) and gradually increasing the system's memory pressure until a bounce buffer allocation fails. Fix this crash by decrementing `ceph_wbc->num_ops` back to the correct value when move_dirty_folio_in_page_array() fails, but the folio already started counting a new (i.e. still-empty) extent. The defect corrected by this patch has existed since 2022 (see first `Fixes:`), but another bug blocked multi-folio encrypted writeback until recently (see second `Fixes:`). The second commit made it into 6.18.16, 6.19.6, and 7.0-rc1, unmasking the panic in those versions. This patch therefore fixes a regression (panic) introduced by cac190c7674f.

    Засегнати продукти

    • Linux Linux: d55207717ded95c8f2760a30e93319fa313186e6 преди f65a96fe2467a9b184c6ae963d95a260a202c98e; d55207717ded95c8f2760a30e93319fa313186e6 преди 5dd151799d826d3736ae60c2b22cbc9d96a2a613; d55207717ded95c8f2760a30e93319fa313186e6 преди 6200f41d6fcf2ac7e24866431e381cbc914560e4; d55207717ded95c8f2760a30e93319fa313186e6 преди ba12c1e578890f6337a415b7dedf476c6d455105; d55207717ded95c8f2760a30e93319fa313186e6 преди a0d9555bf9eaeba34fe6b6bb86f442fe08ba3842
    • Linux Linux: 6.6; преди 6.6; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.30 до 6.18.*; 7.0.4 до 7.0.*; от 7.1 нататък

    История

    • 27 май 2026 Публикувано

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    CVE-2026-46066: Linux | freedomonline.bg