CVE-2026-52914
batman-adv: fix fragment reassembly length accounting
Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix fragment reassembly length accounting batman-adv keeps a running payload length for queued fragments and uses it to validate a fragment chain before reassembly. That accounting currently allows the accumulated fragment length to be truncated during updates. As a result, malformed fragment chains can bypass the intended validation and drive reassembly with inconsistent length state, leading to a local denial of service. Fix the accounting by storing the accumulated length in a length-typed field and rejecting update overflows before the existing validation logic runs. The fix was verified against the original reproducer and against valid fragment reassembly paths.
INFO
Published Date :
June 24, 2026, 8:16 a.m.
Last Modified :
July 8, 2026, 3:12 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel.
- Apply the provided patch.
- Verify fragment reassembly 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-2026-52914.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-52914 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-2026-52914
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-2026-52914 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-52914 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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Initial Analysis by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added CWE CWE-787 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.92 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.34 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.142 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.13 up to (excluding) 5.10.258 Added Reference Type kernel.org: https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 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': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': 'e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': '37be61825b15534a16ff9cfc9546de155b6df982', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': '975563c5de1123dde1ec7946bf5556d20c89d74e', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': 'f653b040dad1af70fa5cd4fe085e4758925480c9', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': 'e910dbf509125fe51ad68e4fa74dc8ab0a8e787a', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': '3eb8bcb823391bd58997831b3c9c152a4ba8e255', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': 'fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0', 'versionType': 'git'}, {'status': 'affected', 'version': '610bfc6bc99bc83680d190ebc69359a05fc7f605', 'lessThan': '9cd3f16c320bfdadd4509358122368deb56a5741', 'versionType': 'git'}], 'programFiles': ['net/batman-adv/fragmentation.c', 'net/batman-adv/types.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/batman-adv/fragmentation.c', 'net/batman-adv/types.h'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix fragment reassembly length accounting batman-adv keeps a running payload length for queued fragments and uses it to validate a fragment chain before reassembly. That accounting currently allows the accumulated fragment length to be truncated during updates. As a result, malformed fragment chains can bypass the intended validation and drive reassembly with inconsistent length state, leading to a local denial of service. Fix the accounting by storing the accumulated length in a length-typed field and rejecting update overflows before the existing validation logic runs. The fix was verified against the original reproducer and against valid fragment reassembly paths. Added Reference https://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982 Added Reference https://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255 Added Reference https://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e Added Reference https://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741 Added Reference https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 Added Reference https://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a Added Reference https://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9 Added Reference https://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0