CVE-2021-47346— coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tmc_update_etf_buffer函数中存在全局越界问题。
Possible ATT&CK Techniques 1 AI
T1046 · Network Service DiscoveryAffected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 0c3fc4d5fa26092853278145aca9b21fa52a3e93< 04bd77ef4f4d9fc6102023b85f4590fc2130aac5 |
affected |
0c3fc4d5fa26092853278145aca9b21fa52a3e93< ef0a06acc6b16388640ad367eedfa2a17f1945db |
affected | ||
0c3fc4d5fa26092853278145aca9b21fa52a3e93< 35c1c4bd2d59ad734129d4e232af9d1098023918 |
affected | ||
0c3fc4d5fa26092853278145aca9b21fa52a3e93< 733d4d95c0101d5f277b8e4910411d016e49a9dc |
affected | ||
0c3fc4d5fa26092853278145aca9b21fa52a3e93< 0115687be7b13993066aef602253a53d55f5b11f |
affected | ||
0c3fc4d5fa26092853278145aca9b21fa52a3e93< 5fae8a946ac2df879caf3f79a193d4766d00239b |
affected | ||
4.14 |
affected | ||
< 4.14 |
unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2021-47346
Vulnerability Information
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Vulnerability Title
coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()
Source: CVE Program / CVE List V5
Vulnerability 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
==================================================================
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tmc_update_etf_buffer函数中存在全局越界问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-47346
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2021-47346 (6)
Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total
| CVE-2023-52732 | 9.8 CRITICAL | ceph: blocklist the kclient when receiving corrupted snap trace |
| CVE-2023-52755 | 9.8 CRITICAL | ksmbd: fix slab out of bounds write in smb_inherit_dacl() |
| CVE-2021-47378 | 9.8 CRITICAL | nvme-rdma: destroy cm id before destroy qp to avoid use after free |
| CVE-2021-47328 | 9.8 CRITICAL | scsi: iscsi: Fix conn use after free during resets |
| CVE-2021-47232 | 9.8 CRITICAL | can: j1939: fix Use-after-Free, hold skb ref while in use |
| CVE-2023-52741 | 9.8 CRITICAL | cifs: Fix use-after-free in rdata->read_into_pages() |
| CVE-2021-47427 | 9.8 CRITICAL | scsi: iscsi: Fix iscsi_task use after free |
| CVE-2021-47308 | 8.8 HIGH | scsi: libfc: Fix array index out of bound exception |
| CVE-2023-52776 | 8.8 HIGH | wifi: ath12k: fix dfs-radar and temperature event locking |
| CVE-2023-52801 | 8.8 HIGH | iommufd: Fix missing update of domains_itree after splitting iopt_area |
| CVE-2023-52798 | 8.8 HIGH | wifi: ath11k: fix dfs radar event locking |
| CVE-2021-47388 | 8.8 HIGH | mac80211: fix use-after-free in CCMP/GCMP RX |
| CVE-2021-47390 | 8.8 HIGH | KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect() |
| CVE-2023-52846 | 8.8 HIGH | hsr: Prevent use after free in prp_create_tagged_frame() |
| CVE-2023-52769 | 8.8 HIGH | wifi: ath12k: fix htt mlo-offset event locking |
| CVE-2023-52790 | 8.8 HIGH | swiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC |
| CVE-2021-47240 | 8.4 HIGH | net: qrtr: fix OOB Read in qrtr_endpoint_post |
| CVE-2023-52829 | 8.4 HIGH | wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps() |
| CVE-2021-47352 | 8.4 HIGH | virtio-net: Add validation for used length |
| CVE-2023-52775 | 8.2 HIGH | net/smc: avoid data corruption caused by decline |
Showing top 20 of 361 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2021-47346
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