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CVE-2025-21836— io_uring/kbuf: reallocate buf lists on upgrade

EPSS 0.01% · P1
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I. Basic Information for CVE-2025-21836

Vulnerability Information
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Vulnerability Title
io_uring/kbuf: reallocate buf lists on upgrade
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: reallocate buf lists on upgrade IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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buf lists在升级时未重新分配。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 2fcabce2d7d34f69a888146dab15b36a917f09d4 ~ 146a185f6c05ee263db715f860620606303c4633 -
LinuxLinux 5.19 -

II. Public POCs for CVE-2025-21836

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III. Intelligence Information for CVE-2025-21836

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Same Patch Batch · Linux · 2025-03-07 · 8 CVEs total

CVE-2025-21835usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
CVE-2025-21838usb: gadget: core: flush gadget workqueue after device removal
CVE-2025-21839KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop
CVE-2025-21840thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header
CVE-2025-21841cpufreq/amd-pstate: Fix cpufreq_policy ref counting
CVE-2025-21842amdkfd: properly free gang_ctx_bo when failed to init user queue
CVE-2025-21843drm/panthor: avoid garbage value in panthor_ioctl_dev_query()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21836

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