CVE-2026-53366
ipv4: account for fraggap on the paged allocation path
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation path In __ip_append_data(), when the paged-allocation branch is taken, alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap, but the fraggap bytes carried over from the previous skb are copied into the new skb's linear area at offset transhdrlen by the subsequent skb_copy_and_csum_bits(). The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic.
INFO
Published Date :
July 16, 2026, 6:16 a.m.
Last Modified :
July 16, 2026, 6:16 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-53366
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 to a patched version.
- Review IPv4 fragment handling code for similar issues.
- Apply necessary adjustments to alloclen and pagedlen.
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-2026-53366.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53366 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-2026-53366
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-2026-53366 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53366 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. 16, 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': '8eb77cc73977d88787b37c92831b1c242e035396', 'lessThan': 'ce494707a9c07f27c219ca67f3e138061f53d9b3', 'versionType': 'git'}, {'status': 'affected', 'version': '8eb77cc73977d88787b37c92831b1c242e035396', 'lessThan': 'a9c24eda24bd15f432e37824e6fc440977cb241c', 'versionType': 'git'}, {'status': 'affected', 'version': '8eb77cc73977d88787b37c92831b1c242e035396', 'lessThan': '77798d7be6ef71e72fb6fc8a2901bf74ebc9706f', 'versionType': 'git'}, {'status': 'affected', 'version': '8eb77cc73977d88787b37c92831b1c242e035396', 'lessThan': 'c04d9ece23deb9e26c19f9ca215e98b3295aa1bb', 'versionType': 'git'}, {'status': 'affected', 'version': '8eb77cc73977d88787b37c92831b1c242e035396', 'lessThan': 'eca856950f7cb1a221e02b99d758409f2c5cec42', 'versionType': 'git'}], 'programFiles': ['net/ipv4/ip_output.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/ip_output.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation path In __ip_append_data(), when the paged-allocation branch is taken, alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap, but the fraggap bytes carried over from the previous skb are copied into the new skb's linear area at offset transhdrlen by the subsequent skb_copy_and_csum_bits(). The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic. Added Reference https://git.kernel.org/stable/c/77798d7be6ef71e72fb6fc8a2901bf74ebc9706f Added Reference https://git.kernel.org/stable/c/a9c24eda24bd15f432e37824e6fc440977cb241c Added Reference https://git.kernel.org/stable/c/c04d9ece23deb9e26c19f9ca215e98b3295aa1bb Added Reference https://git.kernel.org/stable/c/ce494707a9c07f27c219ca67f3e138061f53d9b3 Added Reference https://git.kernel.org/stable/c/eca856950f7cb1a221e02b99d758409f2c5cec42