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Bug#1068770: linux-image-6.1.0-18-amd64: Local privilege escalation vulnerability in kernel n_gsm driver

Cross-posted to 2 groups.

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Control: tags -1 + confirmed pending
Control: found -1 6.1.82-1

Hi,

On Wed, Apr 10, 2024 at 12:16:21PM -0700, LW wrote:
> Package: src:linux
> Version: 6.1.76-1
> Severity: critical
> Tags: upstream security
> Justification: root security hole
> X-Debbugs-Cc: lw-deb-rpt@greyskydesigns.com, Debian Security Team <team@security.debian.org>
> 
> Dear Maintainer,
> 
> A Reddit thread[1] linked to a Github page[2] with a local root
> escalation exploit.  This exploit works on the current "bookworm"
> stable kernel, 6.1.0-18-amd64.
> 
> It can be worked around by blocking the n_gsm driver:
> 
> echo 'blacklist n_gsm' | sudo tee -a /etc/modprobe.d/blacklist-gsm.conf
> sudo rmmod n_gsm
> 
> 
> [1] https://old.reddit.com/r/linux/comments/1c0i7tx/someone_found_a_kernel_0day/
> [2] https://github.com/YuriiCrimson/ExploitGSM/

Thanks we are already aware of the issue.

Upstream is going to apply a mitigation for the issue:
https://lore.kernel.org/stable/2024041054-asleep-replace-96e8@gregkh/T/#m3a8ce43359ad57e447faa4db6ecf4f4c1b60c498

Regards,
Salvatore

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Bug#1068770: linux-image-6.1.0-18-amd64: Local privilege escalation vulnerability in kernel n_gsm driver Salvatore Bonaccorso <carnil@debian.org> - 2024-04-10 21:40 +0200

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