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CVE-2026-64294: 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: mm: do file ownership checks with the proper mount idmap Ever since idmapped mounts were introduced, inode ownership checks (for side-channel protection) in mincore() and madvise(MADV_PAGEOUT) were done against the nop_mnt_idmap, which completely ignores the file's mount's idmap. This results in odd edgecases like: 1) mount/bind-mount with an idmap userA:userB:1 2) userB runs an owner_or_capable() check on file that is owned by userA on-disk/in-memory, but owned by userB after idmap translation 3) owner_or_capable() mysteriously fails as the correct idmap wasn't supplied In the case of mincore/madvise MADV_PAGEOUT, this is usually benign, because file_permission(file, MAY_WRITE) will probably succeed, as it uses the proper idmap internally, but it does not need to be the case on e.g a 0444 file where even the owner itself doesn't have permissions to write to it. Since this is clearly not trivial to get right, introduce a file_owner_or_capable() that can carry the correct semantics, and switch the various users in mm to it. The issue was found by manual code inspection & an off-list discussion with Jan Kara.

    Засегнати продукти

    • Linux Linux: 9caccd41541a6f7d6279928d9f971f6642c361af преди 7368bec565bac3e536cd43579dbde1e715e6ba61; 9caccd41541a6f7d6279928d9f971f6642c361af преди b2f3d94ea310bea9d36d53e9d9b3f45e86c1d893; 9caccd41541a6f7d6279928d9f971f6642c361af преди 744b23aa430d52f5c8e4dbff7d71496d6643bed2; 9caccd41541a6f7d6279928d9f971f6642c361af преди 8344bdf0629457e532797b42d9d2bbf2a2900bbf; 9caccd41541a6f7d6279928d9f971f6642c361af преди 5c942ad7df75925ee166e7f0fb36892d8dde376b; 9caccd41541a6f7d6279928d9f971f6642c361af преди 04ba248d02d9eaa3d9077b00a6134caa75fa3e90; 9caccd41541a6f7d6279928d9f971f6642c361af преди e187bc02f8fa4226d62814592cf064ee4557c470
    • Linux Linux: 5.12; преди 5.12; 5.15.217 до 5.15.*; 6.1.184 до 6.1.*; 6.6.145 до 6.6.*; 6.12.96 до 6.12.*; 6.18.39 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

    История

    • 25 юли 2026 Публикувано

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    CVE-2026-64294: Linux | freedomonline.bg