CVE-2021-47231— can: mcba_usb: fix memory leak in mcba_usb
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 51f3baad7de943780ce0c17bd7975df567dd6e14< 89df95ce32be204eef2e7d4b2f6fb552fb191a68 | affected |
51f3baad7de943780ce0c17bd7975df567dd6e14< a115198caaab6d663bef75823a3c5f0802306d60 | affected | ||
51f3baad7de943780ce0c17bd7975df567dd6e14< 6f87c0e21ad20dd3d22108e33db1c552dfa352a0 | affected | ||
51f3baad7de943780ce0c17bd7975df567dd6e14< 6bd3d80d1f019cefa7011056c54b323f1d8b8e83 | affected | ||
51f3baad7de943780ce0c17bd7975df567dd6e14< d0760a4ef85697bc756d06eae17ae27f3f055401 | affected | ||
51f3baad7de943780ce0c17bd7975df567dd6e14< 91c02557174be7f72e46ed7311e3bea1939840b0 | affected | ||
4.12 | affected | ||
< 4.12 | unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2021-47231
Vulnerability Information
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Vulnerability Title
can: mcba_usb: fix memory leak in mcba_usb
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: fix memory leak in mcba_usb Syzbot reported memory leak in SocketCAN driver for Microchip CAN BUS Analyzer Tool. The problem was in unfreed usb_coherent. In mcba_usb_start() 20 coherent buffers are allocated and there is nothing, that frees them: 1) In callback function the urb is resubmitted and that's all 2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER is not set (see mcba_usb_start) and this flag cannot be used with coherent buffers. Fail log: | [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: device disconnected | [ 1367.059384][ T8420] kmemleak: 20 new suspected memory leaks (see /sys/kernel/debug/kmem) So, all allocated buffers should be freed with usb_free_coherent() explicitly NOTE: The same pattern for allocating and freeing coherent buffers is used in drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
Source: CVE Program / CVE List V5
CVSS Information
N/A
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mcba_usb 中存在内存泄漏问题。
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-2021-47231
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-47231 (6)
Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total
| CVE-2023-52741 | 9.8 CRITICAL | cifs: Fix use-after-free in rdata->read_into_pages() |
| 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-2021-47427 | 9.8 CRITICAL | scsi: iscsi: Fix iscsi_task use after free |
| CVE-2023-52732 | 9.8 CRITICAL | ceph: blocklist the kclient when receiving corrupted snap trace |
| CVE-2021-47232 | 9.8 CRITICAL | can: j1939: fix Use-after-Free, hold skb ref while in use |
| CVE-2021-47328 | 9.8 CRITICAL | scsi: iscsi: Fix conn use after free during resets |
| 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-2021-47308 | 8.8 HIGH | scsi: libfc: Fix array index out of bound exception |
| CVE-2021-47390 | 8.8 HIGH | KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect() |
| 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-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-2023-52846 | 8.8 HIGH | hsr: Prevent use after free in prp_create_tagged_frame() |
| CVE-2021-47352 | 8.4 HIGH | virtio-net: Add validation for used length |
| CVE-2023-52829 | 8.4 HIGH | wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps() |
| CVE-2021-47240 | 8.4 HIGH | net: qrtr: fix OOB Read in qrtr_endpoint_post |
| CVE-2021-47244 | 8.2 HIGH | mptcp: Fix out of bounds when parsing TCP options |
Showing top 20 of 361 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
Same vendor: Linux
- CVE-2026-74579
netfilter: nft_payload: fix mask build for partial field off - CVE-2026-74578
crypto: algif_skcipher - force synchronous processing on tre - CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev
V. Comments for CVE-2021-47231
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