CVE-2026-63858
netfilter: nf_tables: add hook transactions for device deletions
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: add hook transactions for device deletions Restore the flag that indicates that the hook is going away, ie. NFT_HOOK_REMOVE, but add a new transaction object to track deletion of hooks without altering the basechain/flowtable hook_list during the preparation phase. The existing approach that moves the hook from the basechain/flowtable hook_list to transaction hook_list breaks netlink dump path readers of this RCU-protected list. It should be possible use an array for nft_trans_hook to store the deleted hooks to compact the representation but I am not expecting many hook object, specially now that wildcard support for devices is in place. Note that the nft_trans_chain_hooks() list contains a list of struct nft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while this list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE. Note that new commands can be updated to use nft_trans_hook for consistency. This patch also adapts the event notification path to deal with the list of hook transactions.
INFO
Published Date :
July 19, 2026, 3:16 p.m.
Last Modified :
July 19, 2026, 3:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-63858
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
- Apply the provided patch to the Linux kernel.
- Restore the NFT_HOOK_REMOVE flag.
- Implement transaction objects for hook deletions.
- Update event notification paths as needed.
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-2026-63858.
| URL | Resource |
|---|---|
| https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091 | |
| https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63858 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-2026-63858
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-2026-63858 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63858 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.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 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': 'b6d9014a3335194590abdd2a2471ef5147a67645', 'lessThan': '4e69bfb32b2db323d9205fdb30e284481b37817c', 'versionType': 'git'}, {'status': 'affected', 'version': 'b6d9014a3335194590abdd2a2471ef5147a67645', 'lessThan': '10f79dbd7719d1da9f5884d13060322d8729f091', 'versionType': 'git'}, {'status': 'affected', 'version': '7a248f9c74f9f62799718c12efd9e9e391d60b6f', 'versionType': 'git'}, {'status': 'affected', 'version': 'f275989ad04159dbfc62cefb65ba9c5ba1d7c34f', 'versionType': 'git'}, {'status': 'affected', 'version': '62d91062058b42bf70b2c3446aec397bb0ce15ee', 'versionType': 'git'}, {'status': 'affected', 'version': '99180dec5ae582227219d1fdd0dd5ccf53ec7491', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.122', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.47', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.17.15', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.18.4', 'lessThan': '5.19', 'versionType': 'semver'}], 'programFiles': ['include/net/netfilter/nf_tables.h', 'net/netfilter/nf_tables_api.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/net/netfilter/nf_tables.h', 'net/netfilter/nf_tables_api.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: add hook transactions for device deletions Restore the flag that indicates that the hook is going away, ie. NFT_HOOK_REMOVE, but add a new transaction object to track deletion of hooks without altering the basechain/flowtable hook_list during the preparation phase. The existing approach that moves the hook from the basechain/flowtable hook_list to transaction hook_list breaks netlink dump path readers of this RCU-protected list. It should be possible use an array for nft_trans_hook to store the deleted hooks to compact the representation but I am not expecting many hook object, specially now that wildcard support for devices is in place. Note that the nft_trans_chain_hooks() list contains a list of struct nft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while this list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE. Note that new commands can be updated to use nft_trans_hook for consistency. This patch also adapts the event notification path to deal with the list of hook transactions. Added Reference https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091 Added Reference https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c