CVE-2024-50058: serial: protect uart_port_dtr_rts() in uart_shutdown() too
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: serial: protect uart_port_dtr_rts() in uart_shutdown() too Commit af224ca2df29 (serial: core: Prevent unsafe uart port access, part 3) added few uport == NULL checks. It added one to uart_shutdown(), so the commit assumes, uport can be NULL in there. But right after that protection, there is an unprotected "uart_port_dtr_rts(uport, false);" call. That is invoked only if HUPCL is set, so I assume that is the reason why we do not see lots of these reports. Or it cannot be NULL at this point at all for some reason :P. Until the above is investigated, stay on the safe side and move this dereference to the if too. I got this inconsistency from Coverity under CID 1585130. Thanks.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <6.6.57 | |
| Linux Kernel | >=6.7<6.11.4 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/2fe399bb8efd0d325ab1138cf8e3ecf23a39e96d
- https://git.kernel.org/stable/c/399927f0f875b93f3d5a0336d382ba48b8671eb2
- https://git.kernel.org/stable/c/d7b5876a6e74cdf8468a478be6b23f2f5464ac7a
- https://git.kernel.org/stable/c/e418d91195d29d5f9c9685ff309b92b04b41dc40
- https://git.kernel.org/stable/c/76ed24a34223bb2c6b6162e1d8389ec4e602a290
- https://git.kernel.org/stable/c/602babaa84d627923713acaf5f7e9a4369e77473
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50058
- https://nvd.nist.gov/vuln/detail/CVE-2024-50058
- https://launchpad.net/bugs/cve/CVE-2024-50058
- https://security-tracker.debian.org/tracker/CVE-2024-50058
- https://ubuntu.com/security/CVE-2024-50058
- https://git.kernel.org/linus/602babaa84d627923713acaf5f7e9a4369e77473
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