CVE-2021-47107— NFSD: Fix READDIR buffer overflow
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，该漏洞源于存在缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 37aa5e64022243e721b8334122997881177a4cfc< 9e291a6a28d32545ed2fd959a8165144d1724df1 |
affected |
7f87fc2d34d475225e78b7f5c4eabb121f4282b2< eabc0aab98e5218ceecd82069b0d6fdfff5ee885 |
affected | ||
7f87fc2d34d475225e78b7f5c4eabb121f4282b2< 53b1119a6e5028b125f431a0116ba73510d82a72 |
affected | ||
5.13 |
affected | ||
< 5.13 |
unaffected | ||
5.15.12≤ 5.15.* |
unaffected | ||
5.16≤ * |
unaffected |
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I. Basic Information for CVE-2021-47107
Vulnerability Information
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Vulnerability Title
NFSD: Fix READDIR buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
NFSD: Fix READDIR buffer overflow
If a client sends a READDIR count argument that is too small (say,
zero), then the buffer size calculation in the new init_dirlist
helper functions results in an underflow, allowing the XDR stream
functions to write beyond the actual buffer.
This calculation has always been suspect. NFSD has never sanity-
checked the READDIR count argument, but the old entry encoders
managed the problem correctly.
With the commits below, entry encoding changed, exposing the
underflow to the pointer arithmetic in xdr_reserve_space().
Modern NFS clients attempt to retrieve as much data as possible
for each READDIR request. Also, we have no unit tests that
exercise the behavior of READDIR at the lower bound of @count
values. Thus this case was missed during testing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于存在缓冲区溢出。
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-2021-47107
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-47107 (3)
Same Patch Batch · Linux · 2024-03-04 · 26 CVEs total
| CVE-2021-47103 | 9.8 CRITICAL | inet: fully convert sk->sk_rx_dst to RCU rules |
| CVE-2021-47082 | 7.8 HIGH | tun: avoid double free in tun_free_netdev |
| CVE-2021-47087 | 7.8 HIGH | tee: optee: Fix incorrect page free bug |
| CVE-2021-47106 | 7.8 HIGH | netfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy() |
| CVE-2021-47094 | 7.8 HIGH | KVM: x86/mmu: Don't advance iterator after restart due to yielding |
| CVE-2021-47099 | 7.8 HIGH | veth: ensure skb entering GRO are not cloned. |
| CVE-2021-47083 | 7.1 HIGH | pinctrl: mediatek: fix global-out-of-bounds issue |
| CVE-2021-47102 | 7.1 HIGH | net: marvell: prestera: fix incorrect structure access |
| CVE-2021-47095 | ipmi: ssif: initialize ssif_info->client early | |
| CVE-2021-47108 | drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf | |
| CVE-2021-47105 | ice: xsk: return xsk buffers back to pool when cleaning the ring | |
| CVE-2021-47104 | IB/qib: Fix memory leak in qib_user_sdma_queue_pkts() | |
| CVE-2021-47101 | asix: fix uninit-value in asix_mdio_read() | |
| CVE-2021-47100 | ipmi: Fix UAF when uninstall ipmi_si and ipmi_msghandler module | |
| CVE-2021-47098 | hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations | |
| CVE-2021-47097 | Input: elantech - fix stack out of bound access in elantech_change_report_id() | |
| CVE-2021-47096 | ALSA: rawmidi - fix the uninitalized user_pversion | |
| CVE-2024-26622 | tomoyo: fix UAF write bug in tomoyo_write_control() | |
| CVE-2021-47093 | platform/x86: intel_pmc_core: fix memleak on registration failure | |
| CVE-2021-47092 | KVM: VMX: Always clear vmx->fail on emulation_required |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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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-2021-47107
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