CVE-2022-50080None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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.
Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < b37e0f17653c00b586cdbcdf0dbca475358ecffdLinux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 965333345fe952cc7eebc8e3a565ffc709441af2Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 578c349570d2a912401963783b36e0ec7a25c053Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < c12f0e6126ad223806a365084e86370511654bf1Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 2f8e79a1a6128214cb9b205a9869341af5dfb16bLinux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 58c008d4d398f792ca67f35650610864725518fdLinux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 573ae4f13f630d6660008f1974c0a8a29c30e18aLinux 4.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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