CVE-2021-47122— net: caif: fix memory leak in caif_device_notify
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 模块的 caif_device_notify 方法中存在内存泄漏。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 7c18d2205ea76eef9674e59e1ecae4f332a53e9e< b042e2b2039565eb8f0eb51c14fbe1ef463c8cd8 |
affected |
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< 9348c1f10932f13b299cbc8b1bd5f780751fae49 |
affected | ||
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< 4bca2034b41c15b62d47a19158bb76235fd4455d |
affected | ||
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< 3be863c11cab725add9fef4237ed4e232c3fc3bb |
affected | ||
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< f52f4fd67264c70cd0b4ba326962ebe12d9cba94 |
affected | ||
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< af2806345a37313f01b1c9f15e046745b8ee2daa |
affected | ||
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< 6a0e317f61094d377335547e015dd2ff12caf893 |
affected | ||
7c18d2205ea76eef9674e59e1ecae4f332a53e9e< b53558a950a89824938e9811eddfc8efcd94e1bb |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2021-47122
Vulnerability Information
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Vulnerability Title
net: caif: fix memory leak in caif_device_notify
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: caif: fix memory leak in caif_device_notify
In case of caif_enroll_dev() fail, allocated
link_support won't be assigned to the corresponding
structure. So simply free allocated pointer in case
of error
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 模块的 caif_device_notify 方法中存在内存泄漏。
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
II. Public POCs for CVE-2021-47122
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2021-47122 (8)
Same Patch Batch · Linux · 2024-03-15 · 26 CVEs total
| CVE-2021-47111 | 8.8 HIGH | xen-netback: take a reference to the RX task thread |
| CVE-2021-47131 | 8.1 HIGH | net/tls: Fix use-after-free after the TLS device goes down and up |
| CVE-2021-47123 | 7.8 HIGH | io_uring: fix ltout double free on completion race |
| CVE-2021-47135 | 7.8 HIGH | mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report |
| CVE-2021-47129 | 7.8 HIGH | netfilter: nft_ct: skip expectations for confirmed conntrack |
| CVE-2021-47126 | 7.8 HIGH | ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions |
| CVE-2021-47124 | 7.8 HIGH | io_uring: fix link timeout refs |
| CVE-2021-47112 | 7.8 HIGH | x86/kvm: Teardown PV features on boot CPU as well |
| CVE-2021-47132 | 7.5 HIGH | mptcp: fix sk_forward_memory corruption on retransmission |
| CVE-2021-47109 | 7.5 HIGH | neighbour: allow NUD_NOARP entries to be forced GCed |
| CVE-2021-47130 | 7.5 HIGH | nvmet: fix freeing unallocated p2pmem |
| CVE-2021-47113 | 7.1 HIGH | btrfs: abort in rename_exchange if we fail to insert the second ref |
| CVE-2021-47127 | ice: track AF_XDP ZC enabled queues in bitmap | |
| CVE-2021-47110 | x86/kvm: Disable kvmclock on all CPUs on shutdown | |
| CVE-2021-47134 | efi/fdt: fix panic when no valid fdt found | |
| CVE-2021-47133 | HID: amd_sfh: Fix memory leak in amd_sfh_work | |
| CVE-2021-47128 | bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks | |
| CVE-2021-47117 | ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed | |
| CVE-2021-47114 | ocfs2: fix data corruption by fallocate | |
| CVE-2021-47125 | sch_htb: fix refcount leak in htb_parent_to_leaf_offload |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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bpf: Reject dev-bound-only programs on other devices -
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CVE-2026-98380
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Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2021-47122
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