CVE-2024-50195: posix-clock: Fix missing timespec64 check in pc_clock_settime()
First published: Fri Nov 08 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: posix-clock: Fix missing timespec64 check in pc_clock_settime() As Andrew pointed out, it will make sense that the PTP core checked timespec64 struct's tv_sec and tv_nsec range before calling ptp->info->settime64(). As the man manual of clock_settime() said, if tp.tv_sec is negative or tp.tv_nsec is outside the range [0..999,999,999], it should return EINVAL, which include dynamic clocks which handles PTP clock, and the condition is consistent with timespec64_valid(). As Thomas suggested, timespec64_valid() only check the timespec is valid, but not ensure that the time is in a valid range, so check it ahead using timespec64_valid_strict() in pc_clock_settime() and return -EINVAL if not valid. There are some drivers that use tp->tv_sec and tp->tv_nsec directly to write registers without validity checks and assume that the higher layer has checked it, which is dangerous and will benefit from this, such as hclge_ptp_settime(), igb_ptp_settime_i210(), _rcar_gen4_ptp_settime(), and some drivers can remove the checks of itself.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=2.6.39<4.19.323 | |
| Linux Kernel | >=4.20<5.4.285 | |
| Linux Kernel | >=5.5<5.10.228 | |
| Linux Kernel | >=5.11<5.15.169 | |
| Linux Kernel | >=5.16<6.1.114 | |
| Linux Kernel | >=6.2<6.6.58 | |
| Linux Kernel | >=6.7<6.11.5 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 |
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Reference Links
- https://git.kernel.org/stable/c/29f085345cde24566efb751f39e5d367c381c584
- https://git.kernel.org/stable/c/e0c966bd3e31911b57ef76cec4c5796ebd88e512
- https://git.kernel.org/stable/c/673a1c5a2998acbd429d6286e6cad10f17f4f073
- https://git.kernel.org/stable/c/c8789fbe2bbf75845e45302cba6ffa44e1884d01
- https://git.kernel.org/stable/c/27abbde44b6e71ee3891de13e1a228aa7ce95bfe
- https://git.kernel.org/stable/c/a3f169e398215e71361774d13bf91a0101283ac2
- https://git.kernel.org/stable/c/1ff7247101af723731ea42ed565d54fb8f341264
- https://git.kernel.org/stable/c/d8794ac20a299b647ba9958f6d657051fc51a540
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50195
- https://nvd.nist.gov/vuln/detail/CVE-2024-50195
- https://launchpad.net/bugs/cve/CVE-2024-50195
- https://security-tracker.debian.org/tracker/CVE-2024-50195
- https://ubuntu.com/security/CVE-2024-50195
Frequently Asked Questions
What is the severity of CVE-2024-50195?
The severity of CVE-2024-50195 is determined to be moderate due to its potential impact on the Linux kernel's timing operations.
How do I fix CVE-2024-50195?
To fix CVE-2024-50195, update your Linux kernel to a version that includes the security patch addressing this vulnerability.
Which Linux kernel versions are affected by CVE-2024-50195?
CVE-2024-50195 affects Linux kernel versions from 2.6.39 to 6.12-rc3, encompassing a wide range of releases.
What component of the Linux kernel is impacted by CVE-2024-50195?
CVE-2024-50195 impacts the posix-clock component within the Linux kernel.
Can CVE-2024-50195 lead to denial of service?
While CVE-2024-50195 primarily affects timing operations, it could potentially lead to a denial of service under certain conditions.
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