CVE-2024-36016: tty: n_gsm: fix possible out-of-bounds in gsm0_receive()
In the Linux kernel, the following vulnerability has been resolved:
tty: ngsm: fix possible out-of-bounds in gsm0receive()
Assuming the following: - side A configures the ngsm in basic option mode - side B sends the header of a basic option mode frame with data length 1 - side A switches to advanced option mode - side B sends 2 data bytes which exceeds gsm->len Reason: gsm->len is not used in advanced option mode. - side A switches to basic option mode - side B keeps sending until gsm0receive() writes past gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after reconfiguration.
Fix this by changing gsm->count to gsm->len comparison from equal to less than. Also add upper limit checks against the constant MAXMRU in gsm0receive() and gsm1receive() to harden against memory corruption of gsm->len and gsm->mru.
All other checks remain as we still need to limit the data according to the user configuration and actual payload size.
Other sources
In the Linux kernel, the following vulnerability has been resolved:
tty: ngsm: fix possible out-of-bounds in gsm0receive()
The Linux kernel CVE team has assigned CVE-2024-36016 to this issue.
Upstream advisory: https://lore.kernel.org/linux-cve-announce/2024052947-CVE-2024-36016-d30a@gregkh/T
— Red Hat
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-36016?
The severity of CVE-2024-36016 is classified as high due to the potential for out-of-bounds access.
How do I fix CVE-2024-36016?
To fix CVE-2024-36016, update to the latest kernel versions: 6.10 or specific versions outlined in Debian package updates.
What software is affected by CVE-2024-36016?
CVE-2024-36016 affects specific versions of the Red Hat kernel and Debian Linux packages.
Is CVE-2024-36016 present in older kernel versions?
Yes, CVE-2024-36016 is present in older kernel versions prior to the specified fixes.
What components are involved in CVE-2024-36016?
CVE-2024-36016 involves the tty subsystem and the n_gsm protocol in the Linux kernel.