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CVE-2026-98990: 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: namespace: check a submount for references right before unmounting it shrink_submounts() and mark_mounts_for_expiry() first collect all the mounts they are allowed to unmount and then unmount them. Whether a mount is busy is decided by propagate_mount_busy() on the tree. But unmounting the first mount changes the tree that the second one propagates into. propagate_umount() moves a surviving overmount off a copy it unmounts and mounts it where the copy was mounted. If that's where the propagated copy of the second victim is looked up the overmount becomes a candidate of the second umount_tree(). It's childless and so trim_one() commits it without looking at its reference count. So a synchronous umount pulls out a busy mount that is in use somewhere else and marks it MNT_SYNC_UMOUNT while it has users: umount2(/tmp/plshrink/p1, 0) = 0 errno 0 cwd is (unreachable) The same two umounts requested one after the other fail with EBUSY. This needs a mount with MNT_SHRINKABLE, i.e., automounted submounts of NFS, AFS and CIFS or the tracefs mount below debugfs. Bind mounts inherit the flag. Check each mount right before it is unmounted under the same hold of namespace_sem and mount_lock as the umount itself. Make sure that the algorithm stays linear.

    Засегнати продукти

    • Linux Linux: 1064f874abc0d05eeed8993815f584d847b72486 преди cda0c4e502a0f74a191471ce100fb061e5ab35d6; 1064f874abc0d05eeed8993815f584d847b72486 преди 3f55f71291e4332983cd63b288d1f2be3c9c08fc; 1064f874abc0d05eeed8993815f584d847b72486 преди 361f59e7f3f9a219fb5567bf9abc8482a154a399; 1064f874abc0d05eeed8993815f584d847b72486 преди f6394281834492c6516a405a348b545ae698a331; 1064f874abc0d05eeed8993815f584d847b72486 преди 6e4012e571867868b545c91ca9d6095fdb709907; 1064f874abc0d05eeed8993815f584d847b72486 преди d73f04e92c1aab78d96ac6cadb234c8a3a373d22; 1064f874abc0d05eeed8993815f584d847b72486 преди 18902a23ef36f83d32bafc58ae2484e6bb4bb8ef; 1064f874abc0d05eeed8993815f584d847b72486 преди 32bf92416614a1e3ff3524fc6b780259c7aad3ef; 5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf; 839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7; 808e83e5add13152bd4a88346487de68395c136b; 6de9d08a9718ee9c12ba6343c50141c2d633e3dc; 4.1.40 преди 4.2; 4.4.54 преди 4.5; 4.9.15 преди 4.10; 4.10.3 преди 4.11
    • Linux Linux: 4.11; преди 4.11; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.57 до 6.18.*; 7.2.11 до 7.2.*; от 7.3 нататък

    История

    • 23 октомври 2026 Публикувано

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    CVE-2026-98990: Linux | freedomonline.bg