CVE-2021-47346
Linux Coresight TMC ETF Buffer Out-of-Bounds Write
Description
In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer() commit 6f755e85c332 ("coresight: Add helper for inserting synchronization packets") removed trailing '\0' from barrier_pkt array and updated the call sites like etb_update_buffer() to have proper checks for barrier_pkt size before read but missed updating tmc_update_etf_buffer() which still reads barrier_pkt past the array size resulting in KASAN out-of-bounds bug. Fix this by adding a check for barrier_pkt size before accessing like it is done in etb_update_buffer(). BUG: KASAN: global-out-of-bounds in tmc_update_etf_buffer+0x4b8/0x698 Read of size 4 at addr ffffffd05b7d1030 by task perf/2629 Call trace: dump_backtrace+0x0/0x27c show_stack+0x20/0x2c dump_stack+0x11c/0x188 print_address_description+0x3c/0x4a4 __kasan_report+0x140/0x164 kasan_report+0x10/0x18 __asan_report_load4_noabort+0x1c/0x24 tmc_update_etf_buffer+0x4b8/0x698 etm_event_stop+0x248/0x2d8 etm_event_del+0x20/0x2c event_sched_out+0x214/0x6f0 group_sched_out+0xd0/0x270 ctx_sched_out+0x2ec/0x518 __perf_event_task_sched_out+0x4fc/0xe6c __schedule+0x1094/0x16a0 preempt_schedule_irq+0x88/0x170 arm64_preempt_schedule_irq+0xf0/0x18c el1_irq+0xe8/0x180 perf_event_exec+0x4d8/0x56c setup_new_exec+0x204/0x400 load_elf_binary+0x72c/0x18c0 search_binary_handler+0x13c/0x420 load_script+0x500/0x6c4 search_binary_handler+0x13c/0x420 exec_binprm+0x118/0x654 __do_execve_file+0x77c/0xba4 __arm64_compat_sys_execve+0x98/0xac el0_svc_common+0x1f8/0x5e0 el0_svc_compat_handler+0x84/0xb0 el0_svc_compat+0x10/0x50 The buggy address belongs to the variable: barrier_pkt+0x10/0x40 Memory state around the buggy address: ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffd05b7d1000: 00 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03 ^ ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa ==================================================================
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
March 6, 2025, 12:53 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.2
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-2021-47346.
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-2021-47346 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47346 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.
-
Initial Analysis by [email protected]
Mar. 06, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 from (excluding) 5.4.133 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 from (excluding) 5.10.51 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 from (excluding) 5.12.18 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 from (excluding) 5.13.3 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14 from (excluding) 4.19.198 Added Reference Type CVE: https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db 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/0115687be7b13993066aef602253a53d55f5b11f Added Reference https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5 Added Reference https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918 Added Reference https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b Added Reference https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc Added Reference https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer() commit 6f755e85c332 ("coresight: Add helper for inserting synchronization packets") removed trailing '\0' from barrier_pkt array and updated the call sites like etb_update_buffer() to have proper checks for barrier_pkt size before read but missed updating tmc_update_etf_buffer() which still reads barrier_pkt past the array size resulting in KASAN out-of-bounds bug. Fix this by adding a check for barrier_pkt size before accessing like it is done in etb_update_buffer(). BUG: KASAN: global-out-of-bounds in tmc_update_etf_buffer+0x4b8/0x698 Read of size 4 at addr ffffffd05b7d1030 by task perf/2629 Call trace: dump_backtrace+0x0/0x27c show_stack+0x20/0x2c dump_stack+0x11c/0x188 print_address_description+0x3c/0x4a4 __kasan_report+0x140/0x164 kasan_report+0x10/0x18 __asan_report_load4_noabort+0x1c/0x24 tmc_update_etf_buffer+0x4b8/0x698 etm_event_stop+0x248/0x2d8 etm_event_del+0x20/0x2c event_sched_out+0x214/0x6f0 group_sched_out+0xd0/0x270 ctx_sched_out+0x2ec/0x518 __perf_event_task_sched_out+0x4fc/0xe6c __schedule+0x1094/0x16a0 preempt_schedule_irq+0x88/0x170 arm64_preempt_schedule_irq+0xf0/0x18c el1_irq+0xe8/0x180 perf_event_exec+0x4d8/0x56c setup_new_exec+0x204/0x400 load_elf_binary+0x72c/0x18c0 search_binary_handler+0x13c/0x420 load_script+0x500/0x6c4 search_binary_handler+0x13c/0x420 exec_binprm+0x118/0x654 __do_execve_file+0x77c/0xba4 __arm64_compat_sys_execve+0x98/0xac el0_svc_common+0x1f8/0x5e0 el0_svc_compat_handler+0x84/0xb0 el0_svc_compat+0x10/0x50 The buggy address belongs to the variable: barrier_pkt+0x10/0x40 Memory state around the buggy address: ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffd05b7d1000: 00 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03 ^ ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa ================================================================== Added Reference kernel.org https://git.kernel.org/stable/c/04bd77ef4f4d9fc6102023b85f4590fc2130aac5 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ef0a06acc6b16388640ad367eedfa2a17f1945db [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/35c1c4bd2d59ad734129d4e232af9d1098023918 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/733d4d95c0101d5f277b8e4910411d016e49a9dc [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0115687be7b13993066aef602253a53d55f5b11f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5fae8a946ac2df879caf3f79a193d4766d00239b [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-2021-47346 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-2021-47346
weaknesses.