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CVE-2021-47538— rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()

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 rxrpc 模块 rxrpc_lookup_peer() 中的 rxrpc_local 泄漏。

AI Predicted 4.4 Difficulty: Easy EPSS 0.24% · P13

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux e8e51ce79c157188e209e5ea0afaf6b42dd76104< 913c24af2d13a3fd304462916ee98e298d56bdce affected
9ebeddef58c41bd700419cdcece24cf64ce32276< 3e70e3a72d80b16094faccbe438cd53761c3503a affected
9ebeddef58c41bd700419cdcece24cf64ce32276< 60f0b9c42cb80833a03ca57c1c8b078d716e71d1 affected
9ebeddef58c41bd700419cdcece24cf64ce32276< 9469273e616ca8f1b6e3773c5019f21b4c8d828c affected
9ebeddef58c41bd700419cdcece24cf64ce32276< beacff50edbd6c9659a6f15fc7f6126909fade29 affected
9b7fc03b4cdbfb668b6891967105258691c6d3b5 affected
4.19.82< 4.19.220 affected
5.3.9< 5.4 affected
… +7 more rows
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I. Basic Information for CVE-2021-47538

Vulnerability Information
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Vulnerability Title
rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() Need to call rxrpc_put_local() for peer candidate before kfree() as it holds a ref to rxrpc_local. [DH: v2: Changed to abstract the peer freeing code out into a function]
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 rxrpc 模块 rxrpc_lookup_peer() 中的 rxrpc_local 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 e8e51ce79c157188e209e5ea0afaf6b42dd76104 ~ 913c24af2d13a3fd304462916ee98e298d56bdce -
Linux Linux 5.4 -

II. Public POCs for CVE-2021-47538

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III. Intelligence Information for CVE-2021-47538

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Other References for CVE-2021-47538 (3)

Same Patch Batch · Linux · 2024-05-24 · 72 CVEs total

CVE-2021-47544 9.8 CRITICAL tcp: fix page frag corruption on page fault
CVE-2021-47506 9.8 CRITICAL nfsd: fix use-after-free due to delegation race
CVE-2021-47536 9.8 CRITICAL net/smc: fix wrong list_del in smc_lgr_cleanup_early
CVE-2021-47520 8.8 HIGH can: pch_can: pch_can_rx_normal: fix use after free
CVE-2023-52880 7.8 HIGH tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc
CVE-2021-47505 7.8 HIGH aio: fix use-after-free due to missing POLLFREE handling
CVE-2021-47512 7.8 HIGH net/sched: fq_pie: prevent dismantle issue
CVE-2021-47502 7.8 HIGH ASoC: codecs: wcd934x: handle channel mappping list correctly
CVE-2021-47517 7.8 HIGH ethtool: do not perform operations on net devices being unregistered
CVE-2021-47533 7.8 HIGH drm/vc4: kms: Clear the HVS FIFO commit pointer once done
CVE-2021-47500 7.8 HIGH iio: mma8452: Fix trigger reference couting
CVE-2021-47541 7.8 HIGH net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()
CVE-2021-47552 7.8 HIGH blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()
CVE-2021-47551 7.8 HIGH drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again
CVE-2021-47555 7.8 HIGH net: vlan: fix underflow for the real_dev refcnt
CVE-2021-47561 7.8 HIGH i2c: virtio: disable timeout handling
CVE-2021-47535 7.8 HIGH drm/msm/a6xx: Allocate enough space for GMU registers
CVE-2021-47559 7.5 HIGH net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()
CVE-2021-47515 7.5 HIGH seg6: fix the iif in the IPv6 socket control block
CVE-2021-47554 vdpa_sim: avoid putting an uninitialized iova_domain

Showing top 20 of 72 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47538

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