Bug 1900933 (CVE-2020-27786)
| Summary: | CVE-2020-27786 kernel: use-after-free in kernel midi subsystem | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Wade Mealing <wmealing> |
| Component: | vulnerability | Assignee: | Nobody <nobody> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | acaringi, adscvr, airlied, bhu, blc, bmasney, bskeggs, dvlasenk, hdegoede, hkrzesin, iboverma, itamar, jarodwilson, jeremy, jforbes, jkysela, jlelli, jonathan, josef, jross, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mjg59, mlangsdo, nmurray, ptalbert, qzhao, rt-maint, rvrbovsk, steved, walters, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel 5.7-rc6 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A flaw was found in the Linux kernel’s implementation of MIDI, where an attacker with a local account and the permissions to issue ioctl commands to midi devices could trigger a use-after-free issue. A write to this specific memory while freed and before use causes the flow of execution to change and possibly allow for memory corruption or privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
|
Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2023-07-11 08:47:53 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1869536, 1900948, 1900949, 1900950, 1900951, 1900952, 1900953, 1900954, 1900955, 1900956, 1900957, 1900958, 1902539, 1902540, 1902541, 1902542, 1903894, 1914738 | ||
| Bug Blocks: | 1899667, 1936789 | ||
|
Description
Wade Mealing
2020-11-24 03:00:30 UTC
External References: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1f6e3c818dd734c30f6a7eeebf232ba2cf3181d Mitigation: As the midi module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: # echo "install snd-rawmidi /bin/true" >> /etc/modprobe.d/disable-snd-rawmidi.conf The system will need to be restarted if the snd-rawmidi modules are loaded. In most circumstances, the CIFS kernel modules will be unable to be unloaded while any midi / sound devices are active and the protocol is in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services. Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1903894] This was fixed for Fedora with the 5.6.14 stable kernel updates. This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:1578 https://access.redhat.com/errata/RHSA-2021:1578 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:1739 https://access.redhat.com/errata/RHSA-2021:1739 |