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CVE-2025-39963— io_uring: fix incorrect io_kiocb reference in io_link_skb

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io_link_skb函数中错误使用nd参数而非prev_nd参数，可能导致上下文验证错误。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 6fe4220912d19152a26ce19713ab232f4263018d< a89c34babc2e5834aa0905278f26f4dbe4b26b76 affected
6fe4220912d19152a26ce19713ab232f4263018d< 50a98ce1ea694f1ff8e87bc2f8f84096d1736f6a affected
6fe4220912d19152a26ce19713ab232f4263018d< 2c139a47eff8de24e3350dadb4c9d5e3426db826 affected
6.10 affected
< 6.10 unaffected
6.12.49≤ 6.12.* unaffected
6.16.9≤ 6.16.* unaffected
6.17≤ * unaffected
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I. Basic Information for CVE-2025-39963

Vulnerability Information
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Vulnerability Title
io_uring: fix incorrect io_kiocb reference in io_link_skb
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix incorrect io_kiocb reference in io_link_skb In io_link_skb function, there is a bug where prev_notif is incorrectly assigned using 'nd' instead of 'prev_nd'. This causes the context validation check to compare the current notification with itself instead of comparing it with the previous notification. Fix by using the correct prev_nd parameter when obtaining prev_notif.
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io_link_skb函数中错误使用nd参数而非prev_nd参数，可能导致上下文验证错误。
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 6fe4220912d19152a26ce19713ab232f4263018d ~ a89c34babc2e5834aa0905278f26f4dbe4b26b76 -
Linux Linux 6.10 -

II. Public POCs for CVE-2025-39963

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III. Intelligence Information for CVE-2025-39963

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Patches & Fixes for CVE-2025-39963 (1)

Same Patch Batch · Linux · 2025-10-09 · 10 CVEs total

CVE-2025-39961 8.8 HIGH iommu/amd/pgtbl: Fix possible race while increase page table level
CVE-2025-39956 7.8 HIGH igc: don't fail igc_probe() on LED setup error
CVE-2025-39962 7.5 HIGH rxrpc: Fix untrusted unsigned subtract
CVE-2025-39960 7.3 HIGH gpiolib: acpi: initialize acpi_gpio_info struct
CVE-2025-39957 7.1 HIGH wifi: mac80211: increase scan_ies_len for S1G
CVE-2025-39959 ASoC: amd: acp: Fix incorrect retrival of acp_chip_info
CVE-2025-39958 iommu/s390: Make attach succeed when the device was surprise removed
CVE-2025-39955 tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().
CVE-2025-39954 clk: sunxi-ng: mp: Fix dual-divider clock rate readback

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39963

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