Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 618d5612ecb7bfc1c85342daafeb2b47e29e77a3; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 556d446068f90981e5d71ca686bdaccdd545d491; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 0a8f806ea6b5dd64b3d1f05ff774817d5f7ddbd1; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 0708fd6bd8161871bfbadced2ca4319b84ab44fe; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 7085895c59e4057ffae17f58990ccb630087d0d2; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 93224deb50a8d20df3884f3672ce9f982129aa50; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 320ac1af4c0bdb92c864dc9250d1329234820edf; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 78d6f9a9eb2a5da6fcbd76d6191d24b0dcc321be; affected 016c4d92cd16f569c6485ae62b076c1a4b779536 before 3ef938c3503563bfc2ac15083557f880d29c2e64 |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.4.292 through 5.4.*; unaffected 5.10.236 through 5.10.*; unaffected 5.15.180 through 5.15.*; unaffected 6.1.134 through 6.1.*; unaffected 6.6.87 through 6.6.*; unaffected 6.12.23 through 6.12.*; unaffected 6.13.11 through 6.13.*; unaffected 6.14.2 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.