Red Hat: CVE-2024-36016: kernel: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() (Multiple Advisories)

Red Hat: CVE-2024-36016: kernel: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() (Multiple Advisories)

Severity

6

CVSS

(AV:A/AC:H/Au:M/C:C/I:C/A:C)

Published

05/29/2024

Created

07/16/2024

Added

07/16/2024

Modified

12/05/2024

Description

In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() Assuming the following: - side A configures the n_gsm 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 gsm0_receive() 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 MAX_MRU in gsm0_receive() and gsm1_receive() 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.

Solution(s)

• redhat-upgrade-kernel
• redhat-upgrade-kernel-rt

References

• CVE-2024-36016
• RHSA-2024:4533
• RHSA-2024:4554
• RHSA-2024:5101
• RHSA-2024:5102
• RHSA-2024:6993
• RHSA-2024:6997

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