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CVE-2026-98215: Linux

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: selinux: preserve user SID across nested backing files SELinux saves the user file SID in a backing-file security blob so it remains available after mmap() replaces vma->vm_file with a backing file. For nested backing files (overlayfs over overlayfs, or FUSE passthrough backed by overlayfs), user_file may itself be a backing file. Its fsec->sid is the SID of the mounter that opened it, rather than the user that opened the top-level file. mprotect() then checks fd { use } against the mounter SID. This can incorrectly deny access without a domain transition, or check the wrong target SID after one. Copy the saved user SID when user_file is a backing file. Keep using the regular file SID for the first backing layer. With two nested overlayfs mounts and SELinux enforcing, mprotect(PROT_READ) returns EACCES with an fd { use } denial against the mounter SID. With this change, mprotect() succeeds. Tested on arm64 QEMU with a small BusyBox initramfs and a purpose-built SELinux policy. The original test was also repeated with Fedora Cloud Base 44 userspace and gave the same result.

    Засегнати продукти

    • Linux Linux: bc6c380c1159de52a252ed11f19a42c47f60a735 преди caa1b913d90d5dc07073733326d2af0f0288f089; 8bacd09f12c27710228562e4d13163e58c5f4a45 преди 6aaeec59aadcd1eafc18b049f1b759fb6b9d9569; d844702198395d3f80222777030f69db6be6b709 преди 9d99b770e7b67b00bdef9005b928aad13e1d679b; 82544d36b1729153c8aeb179e84750f0c085d3b1 преди ff20d16b2e8230c034e21540043df47222dcc09b; 82544d36b1729153c8aeb179e84750f0c085d3b1 преди 8c0c602202b9a4909b00bc3354e3c0355bc69e65; cd0e707a927a70cdfd8bc5a512a9719a87f5ed51; 6.6.144 преди 6.6.158; 6.12.95 преди 6.12.112; 6.18.38 преди 6.18.54; 7.0.4 преди 7.1
    • Linux Linux: 7.1; преди 7.1; 6.6.158 до 6.6.*; 6.12.112 до 6.12.*; 6.18.54 до 6.18.*; 7.2.8 до 7.2.*; от 7.3 нататък

    История

    • 6 октомври 2026 Публикувано

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    Първоизточници

    CVE-2026-98215: Linux | freedomonline.bg