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Review reviewHigh

CVE-2023-52872

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix race condition in status line change on dead connections gsm_cleanup_mux() cleans up the gsm by closing all DLCIs, stopping all timers, removing the virtual tty devices and clearing the data queues. This procedure, however, may cause subsequent changes of the virtual modem status lines of a DLCI. More data is being added the outgoing data queue and the deleted kick timer is restarted to handle this. At this point many resources have already been removed by the cleanup procedure. Thus, a kernel panic occurs....

CVSS
7.8
EPSS
0.18%
7.60% percentile
CISA KEV
Not listed
Published
2024.05.22
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.18%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix race condition in status line change on dead connections gsm_cleanup_mux() cleans up the gsm by closing all DLCIs, stopping all timers, removing the virtual tty devices and clearing the data queues. This procedure, however, may cause subsequent changes of the virtual modem status lines of a DLCI. More data is being added the outgoing data queue and the deleted kick timer is restarted to handle this. At this point many resources have already been removed by the cleanup procedure. Thus, a kernel panic occurs....

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= dd37f657387853623f20c1b2482afbb9cd8ece33 < 81a4dd5e6c78f5d8952fa8c9d36565db1fe01444, >= c568f7086c6e771c77aad13d727c70ef70e07243 < df6cfab66ff2a44bd23ad5dd5309cb3421bb6593, >= c568f7086c6e771c77aad13d727c70ef70e07243 < 19d34b73234af542cc8a218cf398dee73cdb1890, >= c568f7086c6e771c77aad13d727c70ef70e07243 < ce4df90333c4fe65acb8b5089fdfe9b955ce976a, >= c568f7086c6e771c77aad13d727c70ef70e07243 < 3a75b205de43365f80a33b98ec9289785da56243, >= d834aba5f30d9a6f98f4ca1eb07e501f1989331c, >= 692e847a8e6607909c4a3f98ab16ccee7849bd11, >= 5.15.61 < 5.15.138, >= 5.18.18 < 5.19, >= 5.19.2 < 5.20, >= 6.0, >= 5.19.2 < 6.1.62, >= 6.2 < 6.5.11, >= 6.6 < 6.6.1
Fixed versions
5.15.138, 5.19, 6.1.62, 6.5.11, 6.6.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-362