PatchTheCVECVE-2019-18282: The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerabili
CVE-2019-18282 is a medium-severity flaw (CVSS 5.3) affecting linux kernel, debian linux, a700s firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.
Why this priority
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.9% (top 13%) |
| CISA exploited list | No |
| Weakness | CWE-330 |
| Published | 2020-01-16 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-18282?
linux kernel: upgrade to newer than 5.3.10; debian linux: mitigate or apply the listed mitigation; a700s firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2019-18282 being exploited?
CVE-2019-18282 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-18282 affect?
CVE-2019-18282 affects linux kernel, debian linux, a700s firmware. Severity is medium (CVSS 5.3). The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret
How urgent is CVE-2019-18282?
Priority 50/100. Remotely exploitable, no login, no user action; On your watchlist
Software pages
Linux kernel vulnerabilities · Debian vulnerabilities
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