CVE-2022-49492: nvme-pci: fix a NULL pointer dereference in nvme_alloc_admin_tags
First published: Wed Feb 26 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix a NULL pointer dereference in nvme_alloc_admin_tags In nvme_alloc_admin_tags, the admin_q can be set to an error (typically -ENOMEM) if the blk_mq_init_queue call fails to set up the queue, which is checked immediately after the call. However, when we return the error message up the stack, to nvme_reset_work the error takes us to nvme_remove_dead_ctrl() nvme_dev_disable() nvme_suspend_queue(&dev->queues[0]). Here, we only check that the admin_q is non-NULL, rather than not an error or NULL, and begin quiescing a queue that never existed, leading to bad / NULL pointer dereference.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | <4.9.318 | |
| Linux Kernel | >=4.10<4.14.283 | |
| Linux Kernel | >=4.15<4.19.247 | |
| Linux Kernel | >=4.20<5.4.198 | |
| Linux Kernel | >=5.5<5.10.121 | |
| Linux Kernel | >=5.11<5.15.46 | |
| Linux Kernel | >=5.16<5.17.14 | |
| Linux Kernel | >=5.18<5.18.3 |
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Reference Links
- https://git.kernel.org/stable/c/8321b17789f614414206af07e17ce4751c95dc76
- https://git.kernel.org/stable/c/9e649471b396fa0139d53919354ce1eace9b9a24
- https://git.kernel.org/stable/c/8da2b7bdb47e94bbc4062a3978c708926bcb022c
- https://git.kernel.org/stable/c/f76729662650cd7bc8f8194e057af381370349a7
- https://git.kernel.org/stable/c/af98940dd33c9f9e1beb4f71c0a39260100e2a65
- https://git.kernel.org/stable/c/906c81dba8ee8057523859b5e1a2479e9fd34860
- https://git.kernel.org/stable/c/7a28556082d1fbcbc599baf1c24252dfc73efefc
- https://git.kernel.org/stable/c/54a4c1e47d1b2585e74920399455bd9abbfb2bd7
- https://git.kernel.org/stable/c/da42761181627e9bdc37d18368b827948a583929
Frequently Asked Questions
What is the severity of CVE-2022-49492?
CVE-2022-49492 has a severity rating that is typically categorized as high due to the risk of null pointer dereference leading to a potential denial of service.
How do I fix CVE-2022-49492?
To fix CVE-2022-49492, you should upgrade your Linux kernel to a version that includes the patch addressing this vulnerability.
Which versions of the Linux kernel are affected by CVE-2022-49492?
CVE-2022-49492 affects multiple versions of the Linux kernel, specifically those prior to 4.9.318 and between several ranges up to 5.18.3.
What are the potential impacts of CVE-2022-49492?
The potential impacts of CVE-2022-49492 include system crashes and loss of service due to the null pointer dereference.
Is there any workaround for CVE-2022-49492?
Currently, the best resolution for CVE-2022-49492 is to apply the latest security patches rather than relying on workarounds.
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