CVE-2020-12656
Description
gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks certain domain_release calls, leading to a memory leak. Note: This was disputed with the assertion that the issue does not grant any access not already available. It is a problem that on unloading a specific kernel module some memory is leaked, but loading kernel modules is a privileged operation. A user could also write a kernel module to consume any amount of memory they like and load that replicating the effect of this bug
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-12656
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-12656.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 5.7.6-1 |
| debian | bullseye | fixed | 5.7.6-1 |
| debian | forky | fixed | 5.7.6-1 |
| debian | sid | fixed | 5.7.6-1 |
| debian | trixie | fixed | 5.7.6-1 |
References
Verify integrity in audit chain (admin only). AS-IS.