CVE-2021-46927— nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert
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I. Basic Information for CVE-2021-46927
Vulnerability Information
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Vulnerability Title
nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert
Source: NVD (National Vulnerability Database)
Vulnerability 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().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于使用 get_user_pages_unlocked() 调用来处理 mmap 断言。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-46927
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Same Patch Batch · Linux · 2024-02-27 · 67 CVEs total
| CVE-2021-46951 | tpm: efi: Use local variable for calculating final log size | |
| CVE-2021-46971 | perf/core: Fix unconditional security_locked_down() call | |
| CVE-2021-46970 | bus: mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue | |
| CVE-2021-46969 | bus: mhi: core: Fix invalid error returning in mhi_queue | |
| CVE-2021-46957 | riscv/kprobe: fix kernel panic when invoking sys_read traced by kprobe | |
| CVE-2021-46956 | virtiofs: fix memory leak in virtio_fs_probe() | |
| CVE-2021-46955 | openvswitch: fix stack OOB read while fragmenting IPv4 packets | |
| CVE-2021-46954 | net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets | |
| CVE-2021-46953 | ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure | |
| CVE-2021-46952 | NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds | |
| CVE-2021-46958 | btrfs: fix race between transaction aborts and fsyncs leading to use-after-free | |
| CVE-2021-46950 | md/raid1: properly indicate failure when ending a failed write request | |
| CVE-2021-46949 | sfc: farch: fix TX queue lookup in TX flush done handling | |
| CVE-2021-46948 | sfc: farch: fix TX queue lookup in TX event handling | |
| CVE-2021-46947 | sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues | |
| CVE-2021-46945 | ext4: always panic when errors=panic is specified | |
| CVE-2021-46944 | media: staging/intel-ipu3: Fix memory leak in imu_fmt | |
| CVE-2021-46943 | media: staging/intel-ipu3: Fix set_fmt error handling | |
| CVE-2021-46942 | io_uring: fix shared sqpoll cancellation hangs | |
| CVE-2021-46941 | usb: dwc3: core: Do core softreset when switch mode |
Showing top 20 of 67 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2021-46927
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