CVE-2019-11479

high

Published 2019-06-17 · Modified 2019-06-17

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CVSS v3

—

CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

Description

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

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OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`5.1.11.a-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`4.19.37-4`
sid	Fixed	`4.19.37-4`
forky	Fixed	`4.19.37-4`
bullseye	Fixed	`4.19.37-4`
bookworm	Fixed	`4.19.37-4`

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.