Clarity on Copy Fail

swarfendor437 · 2026-05-01 20:16

Hi everyone,

I was taken aback by an email that was sent to me by a friend in the US. I had helped them remotely with another distribution in the past and they were worried about an article that appeared in Arstechnica about the Copy Fail vulnerability.

I read the article, and from what I could gather this is not an issue for home users but for sysadmins of servers and users who don't have root privileges on such systems.

Have I interpreted this correctly?

Many thanks.

Last edited by swarfendor437 (2026-05-01 20:16)

thunder-key-exchange · 2026-05-03 00:46

I was under the impression that the Copy Fail vulnerability (CVE-2026-31431) was more applicable toward users who did not update their systems regularly. If attackers can only get in via already-compromised software that is existent on one's system, then your understanding sounds more like an issue for server admins, just as you mentioned. There does not appear to be many, if any, articles that exist to console users (especially home users) that their unpatched distros are safe for now. I am unsure of whether I feel safe using my Aquarius-Trinity distro, until a patch is made. I am aware of the crypto socket blocking command:

sudo echo "install algif_aead/bin/false" > /etc/modprobe.d/disable-algif.conf

but is that safe enough for now?

swarfendor437 · 2026-05-03 13:49

This is what I found using Brave A.I. search engine via Mojeek search engine:

"Debian has released an updated kernel to address Copy Fail (CVE-2026-31431). The vulnerability affects nearly all mainstream Linux distributions with kernels built between 2017 and the patch release.

Specifically, the following kernel versions are not affected or are already patched:

Kernel 7.0 and later (including current Fedora branches and Arch Linux Tumbleweed).

Ubuntu 26.04 (Resolute) and later kernels.

Specific stable branches that have backported the fix, such as:

6.19.12

6.18.22

6.12.85

6.6.137

6.1.170

5.15.204

5.10.254

Users on older kernel versions must apply the vendor-provided update or use the temporary mitigation of blacklisting the algif_aead module."

I am in a different GNU/Linux as I post this but from recent memory, Q4OS is currently, following a recent kernel update, on 6.1.4x

Just visited DebianSupport site which gives this advice:

https://debiansupport.com/blog/copy-fai … itigation/

I will probably have to do this on a client I will be visiting shortly as they use their machines for work that I am about to install Q4OS on.

Last edited by swarfendor437 (2026-05-03 13:53)

Q4OS Forum

#1 2026-05-01 20:16

Clarity on Copy Fail

#2 2026-05-03 00:46

Re: Clarity on Copy Fail

#3 2026-05-03 13:49

Re: Clarity on Copy Fail

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