{"id":"DEBIAN-CVE-2022-48731","details":"In the Linux kernel, the following vulnerability has been resolved:  mm/kmemleak: avoid scanning potential huge holes  When using devm_request_free_mem_region() and devm_memremap_pages() to add ZONE_DEVICE memory, if requested free mem region's end pfn were huge(e.g., 0x400000000), the node_end_pfn() will be also huge (see move_pfn_range_to_zone()).  Thus it creates a huge hole between node_start_pfn() and node_end_pfn().  We found on some AMD APUs, amdkfd requested such a free mem region and created a huge hole.  In such a case, following code snippet was just doing busy test_bit() looping on the huge hole.    for (pfn = start_pfn; pfn \u003c end_pfn; pfn++) { \tstruct page *page = pfn_to_online_page(pfn); \t\tif (!page) \t\t\tcontinue; \t...   }  So we got a soft lockup:    watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]   CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1   RIP: 0010:pfn_to_online_page+0x5/0xd0   Call Trace:     ? kmemleak_scan+0x16a/0x440     kmemleak_write+0x306/0x3a0     ? common_file_perm+0x72/0x170     full_proxy_write+0x5c/0x90     vfs_write+0xb9/0x260     ksys_write+0x67/0xe0     __x64_sys_write+0x1a/0x20     do_syscall_64+0x3b/0xc0     entry_SYSCALL_64_after_hwframe+0x44/0xae  I did some tests with the patch.  (1) amdgpu module unloaded  before the patch:    real    0m0.976s   user    0m0.000s   sys     0m0.968s  after the patch:    real    0m0.981s   user    0m0.000s   sys     0m0.973s  (2) amdgpu module loaded  before the patch:    real    0m35.365s   user    0m0.000s   sys     0m35.354s  after the patch:    real    0m1.049s   user    0m0.000s   sys     0m1.042s","modified":"2026-09-01T16:05:28.862748609Z","published":"2024-06-20T12:15:11.517Z","upstream":["CVE-2022-48731"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-48731"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48731.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48731.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48731.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}