{"id":"CVE-2022-50080","summary":"tee: add overflow check in register_shm_helper()","details":"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 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.","modified":"2026-03-20T12:24:52.501635Z","published":"2025-06-18T11:02:23.003Z","related":["SUSE-SU-2025:03204-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50080.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2f8e79a1a6128214cb9b205a9869341af5dfb16b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/573ae4f13f630d6660008f1974c0a8a29c30e18a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/578c349570d2a912401963783b36e0ec7a25c053"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58c008d4d398f792ca67f35650610864725518fd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/965333345fe952cc7eebc8e3a565ffc709441af2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b37e0f17653c00b586cdbcdf0dbca475358ecffd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c12f0e6126ad223806a365084e86370511654bf1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50080.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50080"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"033ddf12bcf5326b93bd604f50a7474a434a35f9"},{"fixed":"b37e0f17653c00b586cdbcdf0dbca475358ecffd"},{"fixed":"965333345fe952cc7eebc8e3a565ffc709441af2"},{"fixed":"578c349570d2a912401963783b36e0ec7a25c053"},{"fixed":"c12f0e6126ad223806a365084e86370511654bf1"},{"fixed":"2f8e79a1a6128214cb9b205a9869341af5dfb16b"},{"fixed":"58c008d4d398f792ca67f35650610864725518fd"},{"fixed":"573ae4f13f630d6660008f1974c0a8a29c30e18a"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50080.json"}}],"schema_version":"1.7.5"}