CVE-2021-46905
net: hso: fix NULL-deref on disconnect regression
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Description
In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e
- https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00
- https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1
- https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3
- https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef
References (9)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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