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CVE-2026-98992: 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: don't copy an unmounted mount tree may_copy_tree() accepts a mount whose root is an nsfs or pidfs file before it checks whether that mount is mounted. This exception exists for nsfs and pidfs mounts. They are part of no mount namespace so neither check_mnt() nor is_mounted() would let them through and bind-mounting a nsfsfd or a pidfd wouldn't work. Problem is that exception also admits a bind mount of such a file when it was lazily unmounted and is only kept alive by a file descriptor: mount --bind /proc/self/ns/net /tmp/x exec 3< /tmp/x umount -l /tmp/x mount --rbind /proc/self/fd/3 /tmp/y With MS_REC or AT_RECURSIVE copy_tree() doesn't stop at the unmounted mount. It copies every mount that stayed attached to it as well. So if you have a bunch of overmounts over the nsfsfd or the pidfd the whole unmounted stack is copied. That's a bug. So refuse to walk an unmounted tree. Copying its root alone stays possible. So a bind mount of a namespace that is gone can still be recreated from a file descriptor on the old one. The file descriptor pins that mount and its root and __has_locked_children() only reads the direct children which don't leave the parent's list without namespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL and are still walked. Copying an unmounted tree recursively fails with EINVAL.

    Засегнати продукти

    • Linux Linux: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 94d05b62dc7aea236db20166e79ee002e466393a; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 07c6a8f004bcc58b4ccf993e6efa7b9b8b4a1b8b; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 31cf157298271392ab5fb0805b28d37c8d7a8057; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 86a2d56b1960720bf1844441c0890621e9db2f25; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 7e037b1fd339d865737c8accd29abcf40130a5a0; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди b47b40c4f058418f9707454543179df240796aad; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 8d3527457e183cedee3003c2897314da49488311; e149ed2b805fefdccf7ccdfc19eca22fdd4514ac преди 8bacbf6be959973b28b691713a872c12eae69eec
    • Linux Linux: 3.19; преди 3.19; 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-2026-98992: Linux | freedomonline.bg