{"id":"CVE-2022-50080","title":"tee: add overflow check in register_shm_helper()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntee: add overflow check in register_shm_helper()\n\nWith special lengths supplied by user space, register_shm_helper() has\nan integer overflow when calculating the number…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < b37e0f17653c00b586cdbcdf0dbca475358ecffd","Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 965333345fe952cc7eebc8e3a565ffc709441af2","Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 578c349570d2a912401963783b36e0ec7a25c053","Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < c12f0e6126ad223806a365084e86370511654bf1","Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 2f8e79a1a6128214cb9b205a9869341af5dfb16b","Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 58c008d4d398f792ca67f35650610864725518fd","Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 573ae4f13f630d6660008f1974c0a8a29c30e18a","Linux 4.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:54:05.265629Z"},"published":"2025-06-18","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:00:16.141Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50080","references":[{"url":"https://git.kernel.org/stable/c/b37e0f17653c00b586cdbcdf0dbca475358ecffd"},{"url":"https://git.kernel.org/stable/c/965333345fe952cc7eebc8e3a565ffc709441af2"},{"url":"https://git.kernel.org/stable/c/578c349570d2a912401963783b36e0ec7a25c053"},{"url":"https://git.kernel.org/stable/c/c12f0e6126ad223806a365084e86370511654bf1"},{"url":"https://git.kernel.org/stable/c/2f8e79a1a6128214cb9b205a9869341af5dfb16b"},{"url":"https://git.kernel.org/stable/c/58c008d4d398f792ca67f35650610864725518fd"},{"url":"https://git.kernel.org/stable/c/573ae4f13f630d6660008f1974c0a8a29c30e18a"}],"tags":["cve.org"],"epss":0.00268,"epssPercentile":0.19072,"ingestedAt":"2026-11-05T22:38:31.646Z","slug":"CVE-2022-50080","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntee: add overflow check in register_shm_helper()\n\nWith special lengths supplied by user space, register_shm_helper() has\nan integer overflow when calculating the number of pages covered by a\nsupplied user space memory region.\n\nThis causes internal_get_user_pages_fast() a helper function of\npin_user_pages_fast() to do a NULL pointer dereference:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n  Modules linked in:\n  CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pc : internal_get_user_pages_fast+0x474/0xa80\n  Call trace:\n   internal_get_user_pages_fast+0x474/0xa80\n   pin_user_pages_fast+0x24/0x4c\n   register_shm_helper+0x194/0x330\n   tee_shm_register_user_buf+0x78/0x120\n   tee_ioctl+0xd0/0x11a0\n   __arm64_sys_ioctl+0xa8/0xec\n   invoke_syscall+0x48/0x114\n\nFix this by adding an an explicit call to access_ok() in\ntee_shm_register_user_buf() to catch an invalid user space address\nearly.\n\n## Affected\n\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < b37e0f17653c00b586cdbcdf0dbca475358ecffd`\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 965333345fe952cc7eebc8e3a565ffc709441af2`\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 578c349570d2a912401963783b36e0ec7a25c053`\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < c12f0e6126ad223806a365084e86370511654bf1`\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 2f8e79a1a6128214cb9b205a9869341af5dfb16b`\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 58c008d4d398f792ca67f35650610864725518fd`\n- `Linux >= 033ddf12bcf5326b93bd604f50a7474a434a35f9 < 573ae4f13f630d6660008f1974c0a8a29c30e18a`\n- `Linux 4.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}