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CVE-2025-39962— rxrpc: Fix untrusted unsigned subtract

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，该漏洞源于未验证无符号减法操作，可能导致整数下溢。

CVSS 7.5 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a< 71571e187106631a8127f2dde780f35caa358d33 affected
9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a< 2429a197648178cd4dc930a9d87c13c547460564 affected
6.16 affected
< 6.16 unaffected
6.16.9≤ 6.16.* unaffected
6.17≤ * unaffected
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I. Basic Information for CVE-2025-39962

Vulnerability Information
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Vulnerability Title
rxrpc: Fix untrusted unsigned subtract
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix untrusted unsigned subtract Fix the following Smatch static checker warning: net/rxrpc/rxgk_app.c:65 rxgk_yfs_decode_ticket() warn: untrusted unsigned subtract. 'ticket_len - 10 * 4' by prechecking the length of what we're trying to extract in two places in the token and decoding for a response packet. Also use sizeof() on the struct we're extracting rather specifying the size numerically to be consistent with the other related statements.
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，该漏洞源于未验证无符号减法操作，可能导致整数下溢。
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 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a ~ 71571e187106631a8127f2dde780f35caa358d33 -
Linux Linux 6.16 -

II. Public POCs for CVE-2025-39962

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III. Intelligence Information for CVE-2025-39962

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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-2025-39963 7.8 HIGH io_uring: fix incorrect io_kiocb reference in io_link_skb
CVE-2025-39956 7.8 HIGH igc: don't fail igc_probe() on LED setup error
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-2025-39962

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