CVE-2026-53245
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2026-53245 NameCVE-2026-53245 Descriptionnet/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus linux…
CVE-2026-53245
| Name | CVE-2026-53245 |
| Description | net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bullseye | 5.10.223-1 | vulnerable |
| bullseye (security) | 5.10.257-1 | vulnerable | |
| bookworm | 6.1.170-3 | vulnerable | |
| bookworm (security) | 6.1.174-1 | vulnerable | |
| trixie | 6.12.86-1 | vulnerable | |
| trixie (security) | 6.12.94-1 | fixed | |
| forky | 7.0.12-2 | vulnerable | |
| sid | 7.0.13-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | trixie | 6.12.94-1 | |||
| linux | source | (unstable) | 7.0.13-1 |
Notes
https://git.kernel.org/linus/7561c7fbc694308da73300f036719e63e42bf0b4 (7.1-rc7)
Apply commands
https://git.kernel.org/linus/7561c7fbc694308da73300f036719e63e42bf0b4 (7.1-rc7)OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.94-1 |
| sid | Fixed | 7.0.13-1 |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
- https://git.kernel.org/stable/c/ae65714d96f68bb252eb20085320bdaacab36c00
- https://git.kernel.org/stable/c/36d259711872e3b2f6cd76a4d270c21931c0f35f
- https://git.kernel.org/stable/c/cc98717e591a963a616fdf15ecf48eefaf45d758
- https://git.kernel.org/stable/c/6d6e42e8e17f18d61327f8653479c5b5e161ae1d
- https://git.kernel.org/stable/c/fd9c3a47c670bec6b18f44454cea023f93b5adb3
- https://git.kernel.org/stable/c/42446ca0f3570663e87183c065e0b4def52dfba2
- https://git.kernel.org/stable/c/6eea6494e542a03cdf755a593b7d74f3f7c260fd
- https://git.kernel.org/stable/c/7561c7fbc694308da73300f036719e63e42bf0b4
- https://security-tracker.debian.org/tracker/CVE-2026-53245
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.