CVE-2019-9213

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

9.0

Description

In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

Predictions

Exploit likelihood

90%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-47957 local linux verified

Metasploit · 2020-01-23

Reliable Datagram Sockets (RDS) - rds_atomic_free_op NULL pointer dereference Privilege Escalation (Metasploit)

Source code queued for fetch — refresh in a moment.

EDB-46502 dos linux verified

Google Security Research · 2019-03-06

Linux < 4.20.14 - Virtual Address 0 is Mappable via Privileged write() to /proc/*/mem

Source code queued for fetch — refresh in a moment.

Metasploit modules

exploit_linux/local/rds_atomic_free_op_null_pointer_deref_priv_esc rank 400

Reliable Datagram Sockets (RDS) rds_atomic_free_op NULL pointer dereference Privilege Escalation

Source code queued for fetch — refresh in a moment.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`4.19.28-1`
sid	Fixed	`4.19.28-1`
forky	Fixed	`4.19.28-1`
bullseye	Fixed	`4.19.28-1`
bookworm	Fixed	`4.19.28-1`

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.