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CVE-2021-46966— ACPI: custom_method: fix potential use-after-free issue

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，该漏洞源于存在释放后重用问题。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux 4bda2b79a9d04c8ba31681c66e95877dbb433416< 1d53ca5d131074c925ce38361fb0376d3bf7e394 affected
5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d< 8b04d57f30caf76649d0567551589af9a66ca9be affected
35b88a10535edcf62d3e6b7893a8cd506ff98a24< 90575d1d9311b753cf1718f4ce9061ddda7dfd23 affected
e4467fb6ef547aa352dc03397f9474ec84eced5b< a5b26a2e362f572d87e9fd35435680e557052a17 affected
03d1571d9513369c17e6848476763ebbd10ec2cb< 72814a94c38a33239793f7622cec6ace1e540c4b affected
03d1571d9513369c17e6848476763ebbd10ec2cb< 62dc2440ebb552aa0d7f635e1697e077d9d21203 affected
03d1571d9513369c17e6848476763ebbd10ec2cb< f16737caf41fc06cfe6e49048becb09657074d4b affected
03d1571d9513369c17e6848476763ebbd10ec2cb< b7a5baaae212a686ceb812c32fceed79c03c0234 affected
… +20 more rows
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I. Basic Information for CVE-2021-46966

Vulnerability Information
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Vulnerability Title
ACPI: custom_method: fix potential use-after-free issue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential use-after-free issue In cm_write(), buf is always freed when reaching the end of the function. If the requested count is less than table.length, the allocated buffer will be freed but subsequent calls to cm_write() will still try to access it. Remove the unconditional kfree(buf) at the end of the function and set the buf to NULL in the -EINVAL error path to match the rest of 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，该漏洞源于存在释放后重用问题。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4bda2b79a9d04c8ba31681c66e95877dbb433416 ~ 1d53ca5d131074c925ce38361fb0376d3bf7e394 -
Linux Linux 5.4 -

II. Public POCs for CVE-2021-46966

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III. Intelligence Information for CVE-2021-46966

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Other References for CVE-2021-46966 (9)

Same Patch Batch · Linux · 2024-02-27 · 67 CVEs total

CVE-2021-46911 9.8 CRITICAL ch_ktls: Fix kernel panic
CVE-2021-46955 8.2 HIGH openvswitch: fix stack OOB read while fragmenting IPv4 packets
CVE-2021-46936 7.8 HIGH net: fix use-after-free in tw_timer_handler
CVE-2021-46973 7.8 HIGH net: qrtr: Avoid potential use after free in MHI send
CVE-2021-46913 7.8 HIGH netfilter: nftables: clone set element expression template
CVE-2021-46969 7.8 HIGH bus: mhi: core: Fix invalid error returning in mhi_queue
CVE-2021-46967 7.8 HIGH vhost-vdpa: fix vm_flags for virtqueue doorbell mapping
CVE-2021-46921 7.8 HIGH locking/qrwlock: Fix ordering in queued_write_lock_slowpath()
CVE-2021-46925 7.8 HIGH net/smc: fix kernel panic caused by race of smc_sock
CVE-2021-46963 7.8 HIGH scsi: qla2xxx: Fix crash in qla2xxx_mqueuecommand()
CVE-2021-46929 7.8 HIGH sctp: use call_rcu to free endpoint
CVE-2021-46958 7.8 HIGH btrfs: fix race between transaction aborts and fsyncs leading to use-after-free
CVE-2021-46933 7.8 HIGH usb: gadget: f_fs: Clear ffs_eventfd in ffs_data_clear.
CVE-2021-46922 7.8 HIGH KEYS: trusted: Fix TPM reservation for seal/unseal
CVE-2021-46948 7.5 HIGH sfc: farch: fix TX queue lookup in TX event handling
CVE-2021-46960 7.5 HIGH cifs: Return correct error code from smb2_get_enc_key
CVE-2021-46912 7.3 HIGH net: Make tcp_allowed_congestion_control readonly in non-init netns
CVE-2021-46974 7.1 HIGH bpf: Fix masking negation logic upon negative dst register
CVE-2021-46908 7.1 HIGH bpf: Use correct permission flag for mixed signed bounds arithmetic
CVE-2021-46910 7.0 HIGH ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUG_KMAP_LOCAL is enabled

Showing top 20 of 67 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-46966

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