CVE-2024-26995: usb: typec: tcpm: Correct the PDO counting in pd_set
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: tcpm: Correct the PDO counting in pdset
Off-by-one errors happen because nrsnkpdo and nrsrcpdo are incorrectly added one. The index of the loop is equal to the number of PDOs to be updated when leaving the loop and it doesn't need to be added one.
When doing the power negotiation, TCPM relies on the "nrsnkpdo" as the size of the local sink PDO array to match the Source capabilities of the partner port. If the off-by-one overflow occurs, a wrong RDO might be sent and unexpected power transfer might happen such as over voltage or over current (than expected).
"nrsrcpdo" is used to set the Rp level when the port is in Source role. It is also the array size of the local Source capabilities when filling up the buffer which will be sent as the Source PDOs (such as in Power Negotiation). If the off-by-one overflow occurs, a wrong Rp level might be set and wrong Source PDOs will be sent to the partner port. This could potentially cause over current or port resets.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-26995?
CVE-2024-26995 has been classified as having a moderate severity due to potential off-by-one errors in the Linux kernel.
How do I fix CVE-2024-26995?
To fix CVE-2024-26995, users should upgrade to the latest stable version of the Linux kernel or apply the patches provided by their distribution.
Which versions of the Linux kernel are affected by CVE-2024-26995?
CVE-2024-26995 affects Linux kernel versions from 6.8 to 6.9-rc4, including all associated release candidates.
Is there a patch available for CVE-2024-26995?
Yes, patches for CVE-2024-26995 have been made available in several maintenance releases, including those found in the Debian repository.
Can CVE-2024-26995 lead to system exploitation?
While CVE-2024-26995 involves an off-by-one error, its potential to lead to system exploitation depends on additional conditions and context regarding the system configuration.