CVE-2021-47542

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47542
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47542.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47542
Related
Published
2024-05-24T15:15:18Z
Modified
2024-09-18T03:18:52.777402Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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

net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic83xxadd_rings()

In qlcnic83xxaddrings(), the indirect function of ahw->hwops->allocmbxargs will be called to allocate memory for cmd.req.arg, and there is a dereference of it in qlcnic83xxaddrings(), which could lead to a NULL pointer dereference on failure of the indirect function like qlcnic83xxallocmbx_args().

Fix this bug by adding a check of allocmbxargs(), this patch imitates the logic of mbx_cmd()'s failure handling.

This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug.

Builds with CONFIG_QLCNIC=m show no new warnings, and our static analyzer no longer warns about this code.

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
5.10.84-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1

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
5.15.15-1

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
5.15.15-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}