CVE-2021-47012

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47012
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47012.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47012
Related
Published
2024-02-28T09:15:38Z
Modified
2024-09-18T01:00:21Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

RDMA/siw: Fix a use after free in siwallocmr

Our code analyzer reported a UAF.

In siwallocmr(), it calls siwmraddmem(mr,..). In the implementation of siwmraddmem(), mem is assigned to mr->mem and then mem is freed via kfree(mem) if xaalloccyclic() failed. Here, mr->mem still point to a freed object. After, the execution continue up to the errout branch of siwallocmr, and the freed mr->mem is used in siwmrdropmem(mr).

My patch moves "mr->mem = mem" behind the if (xaalloccyclic(..)<0) {} section, to avoid the uaf.

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.38-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.38-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.38-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}