bridge: mrp: reject zero test interval to avoid OOM panic

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Summary

CVECVE-2026-31420
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-13 14:16:11 UTC
Updated2026-06-01 17:16:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bridge: mrp: reject zero test interval to avoid OOM panic br_mrp_start_test() and br_mrp_start_in_test() accept the user-supplied interval value from netlink without validation. When interval is 0, usecs_to_jiffies(0) yields 0, causing the delayed work (br_mrp_test_work_expired / br_mrp_in_test_work_expired) to reschedule itself with zero delay. This creates a tight loop on system_percpu_wq that allocates and transmits MRP test frames at maximum rate, exhausting all system memory and causing a kernel panic via OOM deadlock. The same zero-interval issue applies to br_mrp_start_in_test_parse() for interconnect test frames. Use NLA_POLICY_MIN(NLA_U32, 1) in the nla_policy tables for both IFLA_BRIDGE_MRP_START_TEST_INTERVAL and IFLA_BRIDGE_MRP_START_IN_TEST_INTERVAL, so zero is rejected at the netlink attribute parsing layer before the value ever reaches the workqueue scheduling code. This is consistent with how other bridge subsystems (br_fdb, br_mst) enforce range constraints on netlink attributes.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000130000 probability, percentile 0.024970000 (date 2026-06-04)

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 7.0 rc1 All All
Operating System Linux Linux Kernel 7.0 rc2 All All
Operating System Linux Linux Kernel 7.0 rc3 All All
Operating System Linux Linux Kernel 7.0 rc4 All All
Operating System Linux Linux Kernel 7.0 rc5 All All
Operating System Linux Linux Kernel 7.0 rc6 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 20f6a05ef63594feb0c6dfbd629da0448b43124d 630a15a31c2034b5b697f4aabc769b9d80d82446 git Not specified
CNA Linux Linux affected 20f6a05ef63594feb0c6dfbd629da0448b43124d e8ec80430bfa520e7352155d6ac632e527cba7aa git Not specified
CNA Linux Linux affected 20f6a05ef63594feb0c6dfbd629da0448b43124d c9bc352f716d1bebfe43354bce539ec2d0223b30 git Not specified
CNA Linux Linux affected 20f6a05ef63594feb0c6dfbd629da0448b43124d fa6e24963342de4370e3a3c9af41e38277b74cf3 git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e8ec80430bfa520e7352155d6ac632e527cba7aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9bc352f716d1bebfe43354bce539ec2d0223b30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fa6e24963342de4370e3a3c9af41e38277b74cf3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/630a15a31c2034b5b697f4aabc769b9d80d82446 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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