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CVE-2021-47624— net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change

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/sunrpc模块中发现引用计数泄漏问题。在错误处理路径中，当第三个参数buf与offline、online或remove不匹配时，函数返回-EINVAL并忘记减少rpc_xprt对象和rpc_xprt_switch对象的引用计数。

AI Predicted 5.5 Difficulty: Easy EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b< 4b22aa42bd4d2d630ef1854c139275c3532937cb affected
5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b< 5f6024c05a2c0fdd180b29395aaf686d25af3a0f affected
5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b< 776d794f28c95051bc70405a7b1fa40115658a18 affected
5.14 affected
< 5.14 unaffected
5.15.24≤ 5.15.* unaffected
5.16.10≤ 5.16.* unaffected
5.17≤ * unaffected
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I. Basic Information for CVE-2021-47624

Vulnerability Information
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Vulnerability Title
net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change The refcount leak issues take place in an error handling path. When the 3rd argument buf doesn't match with "offline", "online" or "remove", the function simply returns -EINVAL and forgets to decrease the reference count of a rpc_xprt object and a rpc_xprt_switch object increased by rpc_sysfs_xprt_kobj_get_xprt() and rpc_sysfs_xprt_kobj_get_xprt_switch(), causing reference count leaks of both unused objects. Fix this issue by jumping to the error handling path labelled with out_put when buf matches none of "offline", "online" or "remove".
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/sunrpc模块中发现引用计数泄漏问题。在错误处理路径中，当第三个参数buf与offline、online或remove不匹配时，函数返回-EINVAL并忘记减少rpc_xprt对象和rpc_xprt_switch对象的引用计数。
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 5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b ~ 4b22aa42bd4d2d630ef1854c139275c3532937cb -
Linux Linux 5.14 -

II. Public POCs for CVE-2021-47624

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III. Intelligence Information for CVE-2021-47624

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Other References for CVE-2021-47624 (2)

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-2022-48787 7.8 HIGH iwlwifi: fix use-after-free
CVE-2022-48796 7.8 HIGH iommu: Fix potential use-after-free during probe
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-2022-48847 7.8 HIGH watch_queue: Fix filter limit check
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-2022-48791 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted TMF sas_task
CVE-2022-48792 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted SSP/STP 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-2021-47624

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