CVE-2026-64414 Details
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: handle unreadable frags sashiko reports: When an skb with unreadable fragments (such as from devmem TCP, where skb_frags_readable(skb) returns false) is processed by the u32 module, skb_copy_bits() will safely return a negative error code [..] xt_u32: bail out with hotdrop in this case. gather_frags: return -1, just as if we had no fragment header. nfnetlink_queue: restrict to the linear part. nfnetlink_log: restrict to the linear part. v2: - skb_zerocopy helpers don't copy readable flag, i.e. nfnetlink_queue is broken too xt_u32 shouldn't return true if hotdrop was set.
A vulnerability exists in the Linux kernel's netfilter component, specifically within the u32 module, when processing socket buffers (skbs) with unreadable fragments. This issue arises with certain TCP segments, such as those from devmem, where the fragment readability check fails. The problem occurs because the u32 module relies on a function that cannot properly read the fragmented data, leading to a negative error response. As a result, the u32 module may incorrectly indicate a successful operation when it has actually dropped the packet due to the unreadable fragments. This vulnerability affects several versions of the Linux kernel.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been addressed. Instructions for downloading the latest kernel version can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b | kernel.org | Patch |
| https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c | kernel.org | Patch |
| https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e | kernel.org | Patch |
| https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.12, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 7.2 rc1 7.2 rc2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 27, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |