NULL Pointer Dereference Affecting kernel-default package, versions <5.14.21-150400.24.141.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about NULL Pointer Dereference vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-SLES154-KERNELDEFAULT-8447507
- published3 Dec 2024
- disclosed2 Dec 2024
Introduced: 2 Dec 2024
NewCVE-2022-48953 (opens in a new tab)How to fix?
Upgrade SLES:15.4 kernel-default to version 5.14.21-150400.24.141.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-default package and not the kernel-default package as distributed by SLES.
See How to fix? for SLES:15.4 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
rtc: cmos: Fix event handler registration ordering issue
Because acpi_install_fixed_event_handler() enables the event automatically on success, it is incorrect to call it before the handler routine passed to it is ready to handle events.
Unfortunately, the rtc-cmos driver does exactly the incorrect thing by calling cmos_wake_setup(), which passes rtc_handler() to acpi_install_fixed_event_handler(), before cmos_do_probe(), because rtc_handler() uses dev_get_drvdata() to get to the cmos object pointer and the driver data pointer is only populated in cmos_do_probe().
This leads to a NULL pointer dereference in rtc_handler() on boot if the RTC fixed event happens to be active at the init time.
To address this issue, change the initialization ordering of the driver so that cmos_wake_setup() is always called after a successful cmos_do_probe() call.
While at it, change cmos_pnp_probe() to call cmos_do_probe() after the initial if () statement used for computing the IRQ argument to be passed to cmos_do_probe() which is cleaner than calling it in each branch of that if () (local variable "irq" can be of type int, because it is passed to that function as an argument of type int).
Note that commit 6492fed7d8c9 ("rtc: rtc-cmos: Do not check ACPI_FADT_LOW_POWER_S0") caused this issue to affect a larger number of systems, because previously it only affected systems with ACPI_FADT_LOW_POWER_S0 set, but it is present regardless of that commit.
References
- https://www.suse.com/security/cve/CVE-2022-48953.html
- https://bugzilla.suse.com/1231941
- https://git.kernel.org/stable/c/0bcfccb48696aba475f046c2021f0733659ce0ef
- https://git.kernel.org/stable/c/1ba745fce13d19775100eece30b0bfb8b8b10ea6
- https://git.kernel.org/stable/c/4919d3eb2ec0ee364f7e3cf2d99646c1b224fae8
- https://git.kernel.org/stable/c/60c6e563a843032cf6ff84b2fb732cd8754fc10d