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

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buf lists在升级时未重新分配。

CVSS 7.8 · High EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 2fcabce2d7d34f69a888146dab15b36a917f09d4< 146a185f6c05ee263db715f860620606303c4633 affected
2fcabce2d7d34f69a888146dab15b36a917f09d4< 7d0dc28dae836caf7645fef62a10befc624dd17b affected
2fcabce2d7d34f69a888146dab15b36a917f09d4< 2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4 affected
2fcabce2d7d34f69a888146dab15b36a917f09d4< 8802766324e1f5d414a81ac43365c20142e85603 affected
5.19 affected
< 5.19 unaffected
6.6.79≤ 6.6.* unaffected
6.12.16≤ 6.12.* unaffected
… +2 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2fcabce2d7d34f69a888146dab15b36a917f09d4 ~ 146a185f6c05ee263db715f860620606303c4633 -
Linux Linux 5.19 -

II. Public POCs for CVE-2025-21836

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III. Intelligence Information for CVE-2025-21836

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Patches & Fixes for CVE-2025-21836 (4)

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

CVE-2025-21842 7.8 HIGH amdkfd: properly free gang_ctx_bo when failed to init user queue
CVE-2025-21839 7.3 HIGH KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop
CVE-2025-21835 usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
CVE-2025-21838 usb: gadget: core: flush gadget workqueue after device removal
CVE-2025-21840 thermal/netlink: Prevent userspace segmentation fault by adjusting UAPI header
CVE-2025-21841 cpufreq/amd-pstate: Fix cpufreq_policy ref counting
CVE-2025-21843 drm/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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