Description
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix flush_tlb_range() when used for zapping normal PMDs On the following path, flush_tlb_range() can be used for zapping normal PMD entries (PMD entries that point to page tables) together with the PTE entries in the pointed-to page table: collapse_pte_mapped_thp pmdp_collapse_flush flush_tlb_range The arm64 version of flush_tlb_range() has a comment describing that it can be used for page table removal, and does not use any last-level invalidation optimizations. Fix the X86 version by making it behave the same way. Currently, X86 only uses this information for the following two purposes, which I think means the issue doesn't have much impact: - In native_flush_tlb_multi() for checking if lazy TLB CPUs need to be IPI'd to avoid issues with speculative page table walks. - In Hyper-V TLB paravirtualization, again for lazy TLB stuff. The patch "x86/mm: only invalidate final translations with INVLPGB" which is currently under review (see <https://lore.kernel.org/all/20241230175550.4046587-13-riel@surriel.com/>) would probably be making the impact of this a lot worse.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
016c4d92cd16f569c6485ae62b076c1a4b779536 to < 618d5612ecb7bfc1c85342daafeb2b47e29e77a3affected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 556d446068f90981e5d71ca686bdaccdd545d491affected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 0a8f806ea6b5dd64b3d1f05ff774817d5f7ddbd1affected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 0708fd6bd8161871bfbadced2ca4319b84ab44feaffected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 7085895c59e4057ffae17f58990ccb630087d0d2affected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 93224deb50a8d20df3884f3672ce9f982129aa50affected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 320ac1af4c0bdb92c864dc9250d1329234820edfaffected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 78d6f9a9eb2a5da6fcbd76d6191d24b0dcc321beaffected016c4d92cd16f569c6485ae62b076c1a4b779536 to < 3ef938c3503563bfc2ac15083557f880d29c2e64affected
Linux Linux
Default version status: affected
4.20affected0 to < 4.20unaffected5.4.292 to ≤ 5.4.*unaffected5.10.236 to ≤ 5.10.*unaffected5.15.180 to ≤ 5.15.*unaffected6.1.134 to ≤ 6.1.*unaffected6.6.87 to ≤ 6.6.*unaffected6.12.23 to ≤ 6.12.*unaffected6.13.11 to ≤ 6.13.*unaffected6.14.2 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/618d5612ecb7bfc1c85342daafeb2b47e29e77a3 ↗
- https://git.kernel.org/stable/c/556d446068f90981e5d71ca686bdaccdd545d491 ↗
- https://git.kernel.org/stable/c/0a8f806ea6b5dd64b3d1f05ff774817d5f7ddbd1 ↗
- https://git.kernel.org/stable/c/0708fd6bd8161871bfbadced2ca4319b84ab44fe ↗
- https://git.kernel.org/stable/c/7085895c59e4057ffae17f58990ccb630087d0d2 ↗
- https://git.kernel.org/stable/c/93224deb50a8d20df3884f3672ce9f982129aa50 ↗
- https://git.kernel.org/stable/c/320ac1af4c0bdb92c864dc9250d1329234820edf ↗
- https://git.kernel.org/stable/c/78d6f9a9eb2a5da6fcbd76d6191d24b0dcc321be ↗
- https://git.kernel.org/stable/c/3ef938c3503563bfc2ac15083557f880d29c2e64 ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗