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Vulnerability · Published Feb 25, 2020 · Assigned by mitre

CVE-2020-9391

Medium 5.5

In plain English

A medium-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 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.5%top 55.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.5.13-1DEBIAN-CVE-2020-9391
Debian:13linux5.5.13-1DEBIAN-CVE-2020-9391
Debian:14linux5.5.13-1DEBIAN-CVE-2020-9391

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References