# CVE-2021-46927: linux: In the Linux kernel, the following vulnerability has been resolved:  nitro_enclaves: Use get_user_pages_unlocked() ca...

CVE-2021-46927 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46927, released February 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-46927
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 27, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert  After commit 5b78ed24e8ec ("mm/pagemap: add mmap_assert_locked() annotations to find_vma*()"), the call to get_user_pages() will trigger the mmap assert.  static inline void mmap_assert_locked(struct mm_struct *mm) { 	lockdep_assert_held(&mm->mmap_lock); 	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm); }  [   62.521410] kernel BUG at include/linux/mmap_lock.h:156! ........................................................... [   62.538938] RIP: 0010:find_vma+0x32/0x80 ........................................................... [   62.605889] Call Trace: [   62.608502]  <TASK> [   62.610956]  ? lock_timer_base+0x61/0x80 [   62.614106]  find_extend_vma+0x19/0x80 [   62.617195]  __get_user_pages+0x9b/0x6a0 [   62.620356]  __gup_longterm_locked+0x42d/0x450 [   62.623721]  ? finish_wait+0x41/0x80 [   62.626748]  ? __kmalloc+0x178/0x2f0 [   62.629768]  ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves] [   62.635776]  ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves] [   62.639541]  __x64_sys_ioctl+0x82/0xb0 [   62.642620]  do_syscall_64+0x3b/0x90 [   62.645642]  entry_SYSCALL_64_after_hwframe+0x44/0xae  Use get_user_pages_unlocked() when setting the enclave memory regions. That's a similar pattern as mmap_read_lock() used together with get_user_pages().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-46927](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46927.md) | Feb 27, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-46927](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46927.md) | Feb 27, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-46927](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46927.md) | Feb 27, 2024 |

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