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…

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.

Scores

EPSS (exploitation in 30 days)

5.7% · top 7.0% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

• n/a
• CWE-476 (opens in a new tab)All about CWE-476 and its CVEs

Affected products

• n/a

  • affected n/a

References (26)

• 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)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-9213](https://trackcve.app/badge/CVE-2019-9213.svg)](https://trackcve.app/cve/CVE-2019-9213)

Record last updated 4 Aug 2024, 21:38 UTC.