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CVE-2026-31420— bridge: mrp: reject zero test interval to avoid OOM panic

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未拒绝零测试间隔，可能导致内存耗尽和内核崩溃。

AI Predicted 5.9 Difficulty: Easy EPSS 0.09% · P0

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 20f6a05ef63594feb0c6dfbd629da0448b43124d< 610073ffb77ffd2b5eca182d2ac264de4834a175 affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< ec8850be9b2b3beac1c7967d95f169dd2785979d affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< 1ec86b4b9e28170a2565cf36f0e6e2b96b55134d affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< 2120bd8546cd6a63c558d135773aa8f41c8259fc affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< 630a15a31c2034b5b697f4aabc769b9d80d82446 affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< e8ec80430bfa520e7352155d6ac632e527cba7aa affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< c9bc352f716d1bebfe43354bce539ec2d0223b30 affected
20f6a05ef63594feb0c6dfbd629da0448b43124d< fa6e24963342de4370e3a3c9af41e38277b74cf3 affected
… +10 more rows
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I. Basic Information for CVE-2026-31420

Vulnerability Information
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Vulnerability Title
bridge: mrp: reject zero test interval to avoid OOM panic
Source: CVE Program / CVE List V5
Vulnerability Description
In 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未拒绝零测试间隔，可能导致内存耗尽和内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 20f6a05ef63594feb0c6dfbd629da0448b43124d ~ 610073ffb77ffd2b5eca182d2ac264de4834a175 -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-31420

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III. Intelligence Information for CVE-2026-31420

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Patches & Fixes for CVE-2026-31420 (6)

Same Patch Batch · Linux · 2026-04-13 · 15 CVEs total

CVE-2026-31414 9.8 CRITICAL netfilter: nf_conntrack_expect: use expect->helper
CVE-2026-31419 7.8 HIGH net: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-31417 7.5 HIGH net/x25: Fix overflow when accumulating packets
CVE-2026-31426 7.0 HIGH ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31428 netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
CVE-2026-31427 netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
CVE-2026-31425 rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31424 netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
CVE-2026-31423 net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
CVE-2026-31422 net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31421 net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418 netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416 netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415 ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31420

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