CVE-2026-64354
bpf: Validate BTF repeated field counts before expansion
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Validate BTF repeated field counts before expansion btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD, and btf_repeat_fields() expands repeatable fields from array elements into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields(). The remaining-capacity check performs the expanded field count calculation in u32. A malformed BTF can wrap that calculation, causing the check to pass even when the expanded field count exceeds the scratch array capacity. The following memcpy() can then write past the end of the array. Use checked addition and multiplication before copying repeated fields and reject impossible counts.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to include the BTF validation fix.
- Apply patches that validate repeated field counts.
- Use checked addition and multiplication for field counts.
- Reject impossible counts during BTF parsing.
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-2026-64354.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64354 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-2026-64354
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-2026-64354 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64354 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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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'c5ff816d5f13900c3f1f3298cfcc61339e056e56', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'cd407de2ef5dc70f1970b343ffaa16186340fdfd', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'ff77d013b737c0f77d925e2f2c59f0cf3d76bd35', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'b9452b594fd3aecbfd4aa0a6a1f741330a37dab7', 'versionType': 'git'}, {'status': 'affected', 'version': '6f957d972feee9b385ea3ae6530310a84e55ba71', 'versionType': 'git'}, {'status': 'affected', 'version': '6.11.6', 'lessThan': '6.12', 'versionType': 'semver'}], 'programFiles': ['kernel/bpf/btf.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-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/bpf/btf.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'c5ff816d5f13900c3f1f3298cfcc61339e056e56', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'cd407de2ef5dc70f1970b343ffaa16186340fdfd', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'ff77d013b737c0f77d925e2f2c59f0cf3d76bd35', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'b9452b594fd3aecbfd4aa0a6a1f741330a37dab7', 'versionType': 'git'}, {'status': 'affected', 'version': '6f957d972feee9b385ea3ae6530310a84e55ba71', 'versionType': 'git'}, {'status': 'affected', 'version': '6.11.6', 'lessThan': '6.12', 'versionType': 'semver'}], 'programFiles': ['kernel/bpf/btf.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', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/bpf/btf.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
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': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'c5ff816d5f13900c3f1f3298cfcc61339e056e56', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'cd407de2ef5dc70f1970b343ffaa16186340fdfd', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'ff77d013b737c0f77d925e2f2c59f0cf3d76bd35', 'versionType': 'git'}, {'status': 'affected', 'version': '797d73ee232dd1833dec4824bc53a22032e97c1c', 'lessThan': 'b9452b594fd3aecbfd4aa0a6a1f741330a37dab7', 'versionType': 'git'}, {'status': 'affected', 'version': '6f957d972feee9b385ea3ae6530310a84e55ba71', 'versionType': 'git'}, {'status': 'affected', 'version': '6.11.6', 'lessThan': '6.12', 'versionType': 'semver'}], 'programFiles': ['kernel/bpf/btf.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-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/bpf/btf.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: bpf: Validate BTF repeated field counts before expansion btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD, and btf_repeat_fields() expands repeatable fields from array elements into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields(). The remaining-capacity check performs the expanded field count calculation in u32. A malformed BTF can wrap that calculation, causing the check to pass even when the expanded field count exceeds the scratch array capacity. The following memcpy() can then write past the end of the array. Use checked addition and multiplication before copying repeated fields and reject impossible counts. Added Reference https://git.kernel.org/stable/c/b9452b594fd3aecbfd4aa0a6a1f741330a37dab7 Added Reference https://git.kernel.org/stable/c/c5ff816d5f13900c3f1f3298cfcc61339e056e56 Added Reference https://git.kernel.org/stable/c/cd407de2ef5dc70f1970b343ffaa16186340fdfd Added Reference https://git.kernel.org/stable/c/ff77d013b737c0f77d925e2f2c59f0cf3d76bd35