CVE-2026-64414
netfilter: handle unreadable frags
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
July 25, 2026, 10:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64414
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel.
- Apply netfilter and u32 module patches.
- Ensure readable flag is handled correctly.
- Verify xt_u32 hotdrop logic.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64414.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64414 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64414
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64414 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64414 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '65249feb6b3df9e17bab5911ee56fa7b0971e231', 'lessThan': '3b13e7635795394705920cca1e1db7e4ca2e334b', 'versionType': 'git'}, {'status': 'affected', 'version': '65249feb6b3df9e17bab5911ee56fa7b0971e231', 'lessThan': 'fc5bfe63bacf8a3ae307b62b34206406ca733354', 'versionType': 'git'}, {'status': 'affected', 'version': '65249feb6b3df9e17bab5911ee56fa7b0971e231', 'lessThan': '57056be3ec12e7d9ecd20a60d4060f510e4f284c', 'versionType': 'git'}, {'status': 'affected', 'version': '65249feb6b3df9e17bab5911ee56fa7b0971e231', 'lessThan': 'da5b58478a9c1b85608c9e40a3b8432d071b409e', 'versionType': 'git'}], 'programFiles': ['net/ipv6/netfilter/nf_conntrack_reasm.c', 'net/netfilter/nfnetlink_log.c', 'net/netfilter/nfnetlink_queue.c', 'net/netfilter/xt_u32.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/netfilter/nf_conntrack_reasm.c', 'net/netfilter/nfnetlink_log.c', 'net/netfilter/nfnetlink_queue.c', 'net/netfilter/xt_u32.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b Added Reference https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c Added Reference https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e Added Reference https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354