Vulnerability · Published Nov 28, 2020 · Assigned by mitre

CVE-2020-29369

High 7.0

In plain English

A high-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.0High

Exploit odds (30 days)0.5%top 60.3% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11. There is a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	linux	5.7.17-1	DEBIAN-CVE-2020-29369
Debian:13	linux	5.7.17-1	DEBIAN-CVE-2020-29369
Debian:14	linux	5.7.17-1	DEBIAN-CVE-2020-29369
Ubuntu:22.04:LTS	linux-intel-iot-realtime	no fix listed	UBUNTU-CVE-2020-29369
Ubuntu:24.04:LTS	linux-raspi-realtime	no fix listed	UBUNTU-CVE-2020-29369
Ubuntu:22.04:LTS	linux-realtime	no fix listed	UBUNTU-CVE-2020-29369

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.11 x_refsource_MISC
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=246c320a8cfe0b11d81a4af38fa9985ef0cc9a4c x_refsource_MISC
https://bugs.chromium.org/p/project-zero/issues/detail?id=2056 x_refsource_MISC
https://security.netapp.com/advisory/ntap-20210115-0001/ x_refsource_CONFIRM
[oss-security] 20210210 Re: CVE-2021-20200: Linux kernel: close race between munmap() and expand_upwards()/downwards() mailing-list, x_refsource_MLIST
[oss-security] 20210219 Re: CVE-2021-20200: Linux kernel: close race between munmap() and expand_upwards()/downwards() mailing-list, x_refsource_MLIST