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CVE-2025-40210— Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND"

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NFSv4 COMPOUND操作数量限制移除后，可能导致解码时分配过大内存或连接状态异常。

CVSS 7.5 · High EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 48aab1606fa80027143a445224f552b4eeea845b< b3ee7ce432289deac87b9d14e01f2fe6958f7f0b affected
48aab1606fa80027143a445224f552b4eeea845b< 3e7f011c255582d7c914133785bbba1990441713 affected
6.17 affected
< 6.17 unaffected
6.17.8≤ 6.17.* unaffected
6.18≤ * unaffected
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I. Basic Information for CVE-2025-40210

Vulnerability Information
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Vulnerability Title
Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND"
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND" I've found that pynfs COMP6 now leaves the connection or lease in a strange state, which causes CLOSE9 to hang indefinitely. I've dug into it a little, but I haven't been able to root-cause it yet. However, I bisected to commit 48aab1606fa8 ("NFSD: Remove the cap on number of operations per NFSv4 COMPOUND"). Tianshuo Han also reports a potential vulnerability when decoding an NFSv4 COMPOUND. An attacker can place an arbitrarily large op count in the COMPOUND header, which results in: [ 51.410584] nfsd: vmalloc error: size 1209533382144, exceeds total pages, mode:0xdc0(GFP_KERNEL|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0 when NFSD attempts to allocate the COMPOUND op array. Let's restore the operation-per-COMPOUND limit, but increased to 200 for now.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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NFSv4 COMPOUND操作数量限制移除后，可能导致解码时分配过大内存或连接状态异常。
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 48aab1606fa80027143a445224f552b4eeea845b ~ b3ee7ce432289deac87b9d14e01f2fe6958f7f0b -
Linux Linux 6.17 -

II. Public POCs for CVE-2025-40210

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III. Intelligence Information for CVE-2025-40210

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Same Patch Batch · Linux · 2025-11-21 · 3 CVEs total

CVE-2025-40211 ACPI: video: Fix use-after-free in acpi_video_switch_brightness()
CVE-2025-40209 btrfs: fix memory leak of qgroup_list in btrfs_add_qgroup_relation

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40210

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