תיאור (מקור, אנגלית)
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race huge_pmd_unshare() drops a reference on a page table that may have previously been shared across processes, potentially turning it into a normal page table used in another process in which unrelated VMAs can afterwards be installed. If this happens in the middle of a concurrent gup_fast(), gup_fast() could end up walking the page tables of another process. While I don't see any way in which that immediately leads to kernel memory corruption, it is really weird and unexpected. Fix it with an explicit broadcast IPI through tlb_remove_table_sync_one(), just like we do in khugepaged when removing page tables for a THP collapse.
מוצרים מושפעים
linux: linux kernel; debian: debian linux
קישורים10
- git.kernel.org/stable/c/034a52b5ef57c9c8225d94e9067f3390bb33922f Patch
- git.kernel.org/stable/c/1013af4f585fccc4d3e5c5824d174de2257f7d6d Patch
- git.kernel.org/stable/c/952596b08c74e8fe9e2883d1dc8a8f54a37384ec Patch
- git.kernel.org/stable/c/a3d864c901a300c295692d129159fc3001a56185 Patch
- git.kernel.org/stable/c/a6bfeb97941a9187833b526bc6cc4ff5706d0ce9 Patch
- git.kernel.org/stable/c/b7754d3aa7bf9f62218d096c0c8f6c13698fac8b Patch
- git.kernel.org/stable/c/fe684290418ef9ef76630072086ee530b92f02b8 Patch
- project-zero.issues.chromium.org/issues/420715744 Third Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
מדדים
- CVSS 3.1
-
4.7
MEDIUM
מקור הציון: NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — סבירות ניצול
- 0% אחוזון 5 · נכון ל-7 בנובמבר 2026
- CWE
- CWE-362
האם אפשר לנצל את הפגיעות הזו אצלכם?
עדכון אבטחה סוגר את הפרצה הידועה. בדיקת חדירות מראה לאן תוקף עדיין יכול להגיע — עם הוכחה.