CVE-2026-74288

System crash via dying routing-rule reference

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in Linux kernel fib_rules_dump() allows local users to crash the system during concurrent routing-rule deletion and dumping. During rocker_router_fib_event()'s RCU traversal, fib_rule_get() increments a dying fib_rule's reference count without first checking whether it is nonzero. Triggering the race requires local low-privileged access; successful exploitation can interrupt service by crashing the host, with no user interaction.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel fib_rules_dump() allows local users to crash the system during concurrent routing-rule deletion and dumping. During rocker_router_fib_event()'s RCU traversal, fib_rule_get() increments a dying fib_rule's reference count without first checking whether it is nonzero. Triggering the race requires local low-privileged access; successful exploitation can interrupt service by crashing the host, with no user interaction.

The record

CVE
CVE-2026-74288
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-911, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.12
  2. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <0f929b59f4cd0e05bb1ecefe12b77e85911d4be2
  3. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <1fbc6c6efe78f4454a51afa0587efb6826f60f00
  4. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <2821e85c058f81c9948a2fb1a634f7b47457d51c
  5. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <2dfdc210d240bd48bb2ea746430b02b5571b6db9
  6. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <3af0bc1bd9039e2e50abf3e2d7fee411f38bce4e
  7. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <4b7ae30c81c2ee10a644749a3704a5c797ccc308
  8. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <a7ef30753353ba6a95d693b1863a0214222a199a
  9. Affected versionversion=5d7bfd141924a5ece21eb612ad3c56612f041c1e <bb4a5b3c91af3c8d705bb2e9f6f8069a70db26fc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <0f929b59f4cd0e05bb1ecefe12b77e85911d4be2; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <1fbc6c6efe78f4454a51afa0587efb6826f60f00; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <2821e85c058f81c9948a2fb1a634f7b47457d51c; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <2dfdc210d240bd48bb2ea746430b02b5571b6db9; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <3af0bc1bd9039e2e50abf3e2d7fee411f38bce4e; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <4b7ae30c81c2ee10a644749a3704a5c797ccc308; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <a7ef30753353ba6a95d693b1863a0214222a199a; version=5d7bfd141924a5ece21eb612ad3c56612f041c1e <bb4a5b3c91af3c8d705bb2e9f6f8069a70db26fc

Published CVSS scores

1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-911Improper Update of Reference Count
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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