CVE-2025-40046
In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix overshooting recv limit It's reported that sometimes a zcrx request can receive more than was requested. It's caused by io_zcrx_recv_skb() adjusting desc->count for all received buffers including frag lists, but then doing recursive calls to process frag list skbs, which leads to desc->count double accounting and underflow.
Affected versions
Linux kernel versions
6.15
and later are affected. Fixed in
6.17.3,
6.18
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2025-40046?
CVE-2025-40046 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.15 onward and has been patched in 6.17.3 and 6.18. CVE-2025-40046 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40046?
Yes. CVE-2025-40046 has been patched. Fixed versions include 6.17.3 and 6.18. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40046 actively exploited?
No. CVE-2025-40046 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.