5.5

CVE-2022-50080

tee: add overflow check in register_shm_helper()

In the Linux kernel, the following vulnerability has been resolved:

tee: add overflow check in register_shm_helper()

With special lengths supplied by user space, register_shm_helper() has
an integer overflow when calculating the number of pages covered by a
supplied user space memory region.

This causes internal_get_user_pages_fast() a helper function of
pin_user_pages_fast() to do a NULL pointer dereference:

  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
  Modules linked in:
  CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11
  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
  pc : internal_get_user_pages_fast+0x474/0xa80
  Call trace:
   internal_get_user_pages_fast+0x474/0xa80
   pin_user_pages_fast+0x24/0x4c
   register_shm_helper+0x194/0x330
   tee_shm_register_user_buf+0x78/0x120
   tee_ioctl+0xd0/0x11a0
   __arm64_sys_ioctl+0xa8/0xec
   invoke_syscall+0x48/0x114

Fix this by adding an an explicit call to access_ok() in
tee_shm_register_user_buf() to catch an invalid user space address
early.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.16 < 4.19.256
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.211
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.137
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.62
Linux ≫ Linux Kernel Version >= 5.16 < 5.18.19
Linux ≫ Linux Kernel Version >= 5.19 < 5.19.3
Linux ≫ Linux Kernel Version6.0 Updaterc1
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.128
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/b37e0f17653c00b586cdbcdf0dbca475358ecffd
Patch
https://git.kernel.org/stable/c/965333345fe952cc7eebc8e3a565ffc709441af2
Patch
https://git.kernel.org/stable/c/578c349570d2a912401963783b36e0ec7a25c053
Patch
https://git.kernel.org/stable/c/c12f0e6126ad223806a365084e86370511654bf1
Patch
https://git.kernel.org/stable/c/2f8e79a1a6128214cb9b205a9869341af5dfb16b
Patch
https://git.kernel.org/stable/c/58c008d4d398f792ca67f35650610864725518fd
Patch
https://git.kernel.org/stable/c/573ae4f13f630d6660008f1974c0a8a29c30e18a
Patch