CVE-2026-53245
net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr
Description
In the Linux kernel, the following vulnerability has been resolved: net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr In mrp_pdu_parse_vecattr(), vector attribute events are encoded three per byte and valen tracks the number of events left to process. The parser decrements valen after processing the first and second events from each event byte, but not after processing the third one. When valen is exactly a multiple of three, the loop continues after the last valid event and consumes the next byte as a new event byte, applying a spurious event to the MRP applicant state. Additionally, when valen is zero the parser unconditionally consumes attrlen bytes as FirstValue and advances the offset, even though per IEEE 802.1ak a VectorAttribute with only a LeaveAllEvent has valen of zero and no FirstValue or Vector fields. This corrupts the offset for subsequent PDU parsing. Also, when valen exceeds three the loop crosses byte boundaries but the attribute value is not incremented between the last event of one byte and the first event of the next. This causes the first event of the next byte to use the same attribute value as the third event rather than the next consecutive value. Decrement valen after processing the third event, skip FirstValue consumption when valen is zero, and increment the attribute value at the end of each loop iteration.
INFO
Published Date :
June 25, 2026, 9:16 a.m.
Last Modified :
July 7, 2026, 10:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Decrement valen after processing the third event.
- Skip FirstValue consumption when valen is zero.
- Increment attribute value at end of loop iteration.
References to Advisories, Solutions, and Tools
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CVE-2026-53245.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53245 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-2026-53245
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-2026-53245 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53245 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. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo 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) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.9 up to (excluding) 5.10.259 Added Reference Type kernel.org: https://git.kernel.org/stable/c/36d259711872e3b2f6cd76a4d270c21931c0f35f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/42446ca0f3570663e87183c065e0b4def52dfba2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6d6e42e8e17f18d61327f8653479c5b5e161ae1d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6eea6494e542a03cdf755a593b7d74f3f7c260fd Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7561c7fbc694308da73300f036719e63e42bf0b4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ae65714d96f68bb252eb20085320bdaacab36c00 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cc98717e591a963a616fdf15ecf48eefaf45d758 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fd9c3a47c670bec6b18f44454cea023f93b5adb3 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 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': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': 'ae65714d96f68bb252eb20085320bdaacab36c00', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': '36d259711872e3b2f6cd76a4d270c21931c0f35f', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': 'cc98717e591a963a616fdf15ecf48eefaf45d758', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': '6d6e42e8e17f18d61327f8653479c5b5e161ae1d', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': 'fd9c3a47c670bec6b18f44454cea023f93b5adb3', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': '42446ca0f3570663e87183c065e0b4def52dfba2', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': '6eea6494e542a03cdf755a593b7d74f3f7c260fd', 'versionType': 'git'}, {'status': 'affected', 'version': 'febf018d22347b5df94066bca05d0c11a84e839d', 'lessThan': '7561c7fbc694308da73300f036719e63e42bf0b4', 'versionType': 'git'}], 'programFiles': ['net/802/mrp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.9'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.9', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/802/mrp.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr In mrp_pdu_parse_vecattr(), vector attribute events are encoded three per byte and valen tracks the number of events left to process. The parser decrements valen after processing the first and second events from each event byte, but not after processing the third one. When valen is exactly a multiple of three, the loop continues after the last valid event and consumes the next byte as a new event byte, applying a spurious event to the MRP applicant state. Additionally, when valen is zero the parser unconditionally consumes attrlen bytes as FirstValue and advances the offset, even though per IEEE 802.1ak a VectorAttribute with only a LeaveAllEvent has valen of zero and no FirstValue or Vector fields. This corrupts the offset for subsequent PDU parsing. Also, when valen exceeds three the loop crosses byte boundaries but the attribute value is not incremented between the last event of one byte and the first event of the next. This causes the first event of the next byte to use the same attribute value as the third event rather than the next consecutive value. Decrement valen after processing the third event, skip FirstValue consumption when valen is zero, and increment the attribute value at the end of each loop iteration. Added Reference https://git.kernel.org/stable/c/36d259711872e3b2f6cd76a4d270c21931c0f35f Added Reference https://git.kernel.org/stable/c/42446ca0f3570663e87183c065e0b4def52dfba2 Added Reference https://git.kernel.org/stable/c/6d6e42e8e17f18d61327f8653479c5b5e161ae1d Added Reference https://git.kernel.org/stable/c/6eea6494e542a03cdf755a593b7d74f3f7c260fd Added Reference https://git.kernel.org/stable/c/7561c7fbc694308da73300f036719e63e42bf0b4 Added Reference https://git.kernel.org/stable/c/ae65714d96f68bb252eb20085320bdaacab36c00 Added Reference https://git.kernel.org/stable/c/cc98717e591a963a616fdf15ecf48eefaf45d758 Added Reference https://git.kernel.org/stable/c/fd9c3a47c670bec6b18f44454cea023f93b5adb3