CVE-2022-48731
Linux AMD Kmemleak Lockup Vulnerability
Description
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 < end_pfn; pfn++) { struct page *page = pfn_to_online_page(pfn); if (!page) continue; ... } 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
INFO
Published Date :
June 20, 2024, 12:15 p.m.
Last Modified :
April 1, 2025, 6:27 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2022-48731.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2022-48731 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-48731 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 01, 2025
Action Type Old Value New Value Added CWE CWE-667 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 5.16.8 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.22 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.99 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.178 Added Reference Type CVE: https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134 Added Reference https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e Added Reference https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db Added Reference https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529 Added Reference https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 29, 2024
Action Type Old Value New Value Added CVSS V3.1 CISA-ADP AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 20, 2024
Action Type Old Value New Value Added Description 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 < end_pfn; pfn++) { struct page *page = pfn_to_online_page(pfn); if (!page) continue; ... } 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 Added Reference kernel.org https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-48731 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-48731
weaknesses.