CVE-2023-52915
media: dvb-usb-v2: af9035: Fix null-ptr-deref in af9035_i2c_master_xfer
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Description
In the Linux kernel, the following vulnerability has been resolved: media: dvb-usb-v2: af9035: Fix null-ptr-deref in af9035_i2c_master_xfer In af9035_i2c_master_xfer, msg is controlled by user. When msg[i].buf is null and msg[i].len is zero, former checks on msg[i].buf would be passed. Malicious data finally reach af9035_i2c_master_xfer. If accessing msg[i].buf[0] without sanity check, null ptr deref would happen. We add check on msg[i].len to prevent crash. Similar commit: commit 0ed554fd769a ("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")
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/0143f282b15f7cedc0392ea10050fb6000fd16e6
- https://git.kernel.org/stable/c/41b7181a40af84448a2b144fb02d8bf32b7e9a23
- https://git.kernel.org/stable/c/6c01ef65de0b321b2db1ef9abf8f1d15862b937e
- https://git.kernel.org/stable/c/7bf744f2de0a848fb1d717f5831b03db96feae89
- https://git.kernel.org/stable/c/b2f54ed7739dfdf42c4df0a11131aad7c8635464
References (8)
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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