CVE-2019-9213
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…
- 5.5MediumCVSS base score
- 5.7%Exploitation in 30 daysEPSS · top 6.9% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 3Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module and 2 Exploit-DB entries for it. A reference of the record is tagged as an exploit.
Show the exploits4
Metasploit modules1 module
- Reliable Datagram Sockets (RDS) rds_atomic_free_op NULL pointer dereference Privilege Escalation (Metasploit module) (opens in a new tab)
exploit/linux/local/rds_atomic_free_op_null_pointer_deref_priv_escRank gooddisclosed 1 Nov 2018
Exploit-DB2 entries
- Reliable Datagram Sockets (RDS) - rds_atomic_free_op NULL pointer dereference Privilege Escalation (Metasploit) (Exploit-DB entry) (opens in a new tab)
EDB-ID 47957local, linuxpublished 23 Jan 2020Verified
- Linux < 4.20.14 - Virtual Address 0 is Mappable via Privileged write() to /proc/*/mem (Exploit-DB entry) (opens in a new tab)
EDB-ID 46502dos, linuxpublished 6 Mar 2019Verified
References tagged exploit1 reference
- 46502 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 6 days later
· 6 days later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 5.7% · top 6.9% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
n/a
- affected n/a
References
References26
- 46502 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0a1d52994d440e21def1c2174932410b4f2a98a1 (opens in a new tab)x_refsource_MISCx_transferred
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.162 (opens in a new tab)x_refsource_MISCx_transferred
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.27 (opens in a new tab)x_refsource_MISCx_transferred
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.105 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/torvalds/linux/commit/0a1d52994d440e21def1c2174932410b4f2a98a1 (opens in a new tab)x_refsource_MISCx_transferred
- 107296 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1792 (opens in a new tab)x_refsource_MISCx_transferred
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.14 (opens in a new tab)x_refsource_MISCx_transferred
- [debian-lts-announce] 20190327 [SECURITY] [DLA 1731-1] linux security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- openSUSE-SU-2019:1085 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- [debian-lts-announce] 20190401 [SECURITY] [DLA 1731-2] linux regression update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- USN-3932-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3932-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3930-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3931-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3933-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3931-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3930-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3933-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- openSUSE-SU-2019:1193 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- RHSA-2019:0831 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- [debian-lts-announce] 20190503 [SECURITY] [DLA 1771-1] linux-4.9 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- RHSA-2019:1479 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1480 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- http://packetstormsecurity.com/files/156053/Reliable-Datagram-Sockets-RDS-rds_atomic_free_op-Privilege-Escalation.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-18588 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2019-9213)Record last updated .