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CVE-2022-48815— net: dsa: bcm_sf2: don't use devres for mdiobus

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net:dsa:bcm_sf2模块在使用devres分配mdiobus时，如果从devm_mdiobus_free函数调用mdiobus_free函数，并且mdiobus之前没有被注销，将会导致恐慌。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux ac3a68d56651c3dad2c12c7afce065fe15267f44< 2770b795294ed312375c11ef1d0b810499c66b83 affected
ac3a68d56651c3dad2c12c7afce065fe15267f44< caabb5f64f5c32fceed93356bb688ef1ec6c5783 affected
ac3a68d56651c3dad2c12c7afce065fe15267f44< 08e1a3554e99a1a5bd2835907381e2383ee85cae affected
ac3a68d56651c3dad2c12c7afce065fe15267f44< 08f1a20822349004bb9cc1b153ecb516e9f2889d affected
5.9 affected
< 5.9 unaffected
5.10.101≤ 5.10.* unaffected
5.15.24≤ 5.15.* unaffected
… +2 more rows
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I. Basic Information for CVE-2022-48815

Vulnerability Information
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Vulnerability Title
net: dsa: bcm_sf2: don't use devres for mdiobus
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: dsa: bcm_sf2: don't use devres for mdiobus As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The Starfighter 2 is a platform device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the bcm_sf2 switch driver on shutdown. So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The bcm_sf2 driver has the code structure in place for orderly mdiobus removal, so just replace devm_mdiobus_alloc() with the non-devres variant, and add manual free where necessary, to ensure that we don't let devres free a still-registered bus.
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net:dsa:bcm_sf2模块在使用devres分配mdiobus时，如果从devm_mdiobus_free函数调用mdiobus_free函数，并且mdiobus之前没有被注销，将会导致恐慌。
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 ac3a68d56651c3dad2c12c7afce065fe15267f44 ~ 2770b795294ed312375c11ef1d0b810499c66b83 -
Linux Linux 5.9 -

II. Public POCs for CVE-2022-48815

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III. Intelligence Information for CVE-2022-48815

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Other References for CVE-2022-48815 (4)

Same Patch Batch · Linux · 2024-07-16 · 98 CVEs total

CVE-2022-48790 9.8 CRITICAL nvme: fix a possible use-after-free in controller reset during load
CVE-2022-48789 9.8 CRITICAL nvme-tcp: fix possible use-after-free in transport error_recovery work
CVE-2022-48788 9.8 CRITICAL nvme-rdma: fix possible use-after-free in transport error_recovery work
CVE-2022-48851 9.8 CRITICAL staging: gdm724x: fix use after free in gdm_lte_rx()
CVE-2022-48829 9.1 CRITICAL NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes
CVE-2022-48828 9.1 CRITICAL NFSD: Fix ia_size underflow
CVE-2022-48864 8.8 HIGH vdpa/mlx5: add validation for VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET command
CVE-2022-48830 8.8 HIGH can: isotp: fix potential CAN frame reception race in isotp_rcv()
CVE-2022-48782 8.8 HIGH mctp: fix use after free
CVE-2022-48785 8.8 HIGH ipv6: mcast: use rcu-safe version of ipv6_get_lladdr()
CVE-2022-48786 7.8 HIGH vsock: remove vsock from connected table when connect is interrupted by a signal
CVE-2022-48839 7.8 HIGH net/packet: fix slab-out-of-bounds access in packet_recvmsg()
CVE-2022-48779 7.8 HIGH net: mscc: ocelot: fix use-after-free in ocelot_vlan_del()
CVE-2022-48821 7.8 HIGH misc: fastrpc: avoid double fput() on failed usercopy
CVE-2022-48822 7.8 HIGH usb: f_fs: Fix use-after-free for epfile
CVE-2022-48816 7.8 HIGH SUNRPC: lock against ->sock changing during sysfs read
CVE-2022-48792 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task
CVE-2022-48796 7.8 HIGH iommu: Fix potential use-after-free during probe
CVE-2022-48787 7.8 HIGH iwlwifi: fix use-after-free
CVE-2022-48791 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted TMF sas_task

Showing top 20 of 98 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48815

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