CVE-2020-12656 · cross-distro fix matrix

CVE-2020-12656: 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

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2020-12656 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

linux→ fixed in5.7.6-1urgency: unimportant

sudo apt-get install --only-upgrade -y linux

Debian bookworm

Source: Debian Security Tracker

linux→ fixed in5.7.6-1urgency: unimportant

sudo apt-get install --only-upgrade -y linux

Debian trixie

Source: Debian Security Tracker

linux→ fixed in5.7.6-1urgency: unimportant

sudo apt-get install --only-upgrade -y linux

Are YOU affected by CVE-2020-12656?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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