Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2024-36016

tty: n_gsm: fix possible out-of-bounds in gsm0_receive()

Published
Last modified
published
Not listed in CISA KEV
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    Version range not reported

  • Linux Linux

    2.6.35

References 9

git.kernel.org