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CVE-2021-47160— net: dsa: mt7530: fix VLAN traffic leaks

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，该漏洞源于当启用 VLAN 过滤时，PCR_MATRIX 字段设置为全 1，但是禁用时没有重置，可能会导致流量泄漏。

CVSS 8.1 · High EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 83163f7dca5684816d01c8ccf4857aa74801e7b7< ae389812733b1b1e8e07fcc238e41db166b5c78d affected
83163f7dca5684816d01c8ccf4857aa74801e7b7< 4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488 affected
83163f7dca5684816d01c8ccf4857aa74801e7b7< b91117b66fe875723a4e79ec6263526fffdb44d2 affected
83163f7dca5684816d01c8ccf4857aa74801e7b7< 82ae35b6c14feae5f216913d5b433e143c756d4e affected
83163f7dca5684816d01c8ccf4857aa74801e7b7< 474a2ddaa192777522a7499784f1d60691cd831a affected
4.16 affected
< 4.16 unaffected
4.19.193≤ 4.19.* unaffected
… +4 more rows
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I. Basic Information for CVE-2021-47160

Vulnerability Information
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Vulnerability Title
net: dsa: mt7530: fix VLAN traffic leaks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: dsa: mt7530: fix VLAN traffic leaks PCR_MATRIX field was set to all 1's when VLAN filtering is enabled, but was not reset when it is disabled, which may cause traffic leaks: ip link add br0 type bridge vlan_filtering 1 ip link add br1 type bridge vlan_filtering 1 ip link set swp0 master br0 ip link set swp1 master br1 ip link set br0 type bridge vlan_filtering 0 ip link set br1 type bridge vlan_filtering 0 # traffic in br0 and br1 will start leaking to each other As port_bridge_{add,del} have set up PCR_MATRIX properly, remove the PCR_MATRIX write from mt7530_port_set_vlan_aware.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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，该漏洞源于当启用 VLAN 过滤时，PCR_MATRIX 字段设置为全 1，但是禁用时没有重置，可能会导致流量泄漏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 83163f7dca5684816d01c8ccf4857aa74801e7b7 ~ ae389812733b1b1e8e07fcc238e41db166b5c78d -
Linux Linux 4.16 -

II. Public POCs for CVE-2021-47160

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III. Intelligence Information for CVE-2021-47160

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Other References for CVE-2021-47160 (5)

Same Patch Batch · Linux · 2024-03-25 · 40 CVEs total

CVE-2021-47137 9.8 CRITICAL net: lantiq: fix memory corruption in RX ring
CVE-2021-47168 9.8 CRITICAL NFS: fix an incorrect limit in filelayout_decode_layout()
CVE-2021-47162 9.8 CRITICAL tipc: skb_linearize the head skb when reassembling msgs
CVE-2021-47136 8.6 HIGH net: zero-initialize tc skb extension on allocation
CVE-2021-47153 7.8 HIGH i2c: i801: Don't generate an interrupt on bus reset
CVE-2021-47152 7.8 HIGH mptcp: fix data stream corruption
CVE-2021-47158 7.8 HIGH net: dsa: sja1105: add error handling in sja1105_setup()
CVE-2021-47159 7.8 HIGH net: dsa: fix a crash if ->get_sset_count() fails
CVE-2021-47148 7.8 HIGH octeontx2-pf: fix a buffer overflow in otx2_set_rxfh_context()
CVE-2021-47163 7.8 HIGH tipc: wait and exit until all work queues are done
CVE-2021-47175 7.8 HIGH net/sched: fq_pie: fix OOB access in the traffic path
CVE-2021-47142 7.8 HIGH drm/amdgpu: Fix a use-after-free
CVE-2021-47178 7.5 HIGH scsi: target: core: Avoid smp_processor_id() in preemptible code
CVE-2021-47179 7.5 HIGH NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()
CVE-2021-47169 serial: rp2: use 'request_firmware' instead of 'request_firmware_nowait'
CVE-2021-47180 NFC: nci: fix memory leak in nci_allocate_device
CVE-2021-47167 NFS: Fix an Oopsable condition in __nfs_pageio_add_request()
CVE-2021-47170 USB: usbfs: Don't WARN about excessively large memory allocations
CVE-2021-47171 net: usb: fix memory leak in smsc75xx_bind
CVE-2021-47172 iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers

Showing top 20 of 40 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47160

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