CVE-2024-49855: nbd: fix race between timeout and normal completion
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between timeout and normal completion If request timetout is handled by nbd_requeue_cmd(), normal completion has to be stopped for avoiding to complete this requeued request, other use-after-free can be triggered. Fix the race by clearing NBD_CMD_INFLIGHT in nbd_requeue_cmd(), meantime make sure that cmd->lock is grabbed for clearing the flag and the requeue.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.18.4<5.19 | |
| Linux Kernel | >=5.19<6.1.113 | |
| Linux Kernel | >=6.2<6.6.54 | |
| Linux Kernel | >=6.7<6.10.13 | |
| Linux Kernel | >=6.11<6.11.2 | |
| Linux Kernel | =5.17.15 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.25-1 6.12.27-1 | |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/9c25faf72d780a9c71081710cd48759d61ff6e9b
- https://git.kernel.org/stable/c/6e73b946a379a1dfbb62626af93843bdfb53753d
- https://git.kernel.org/stable/c/5236ada8ebbd9e7461f17477357582f5be4f46f7
- https://git.kernel.org/stable/c/9a74c3e6c0d686c26ba2aab66d15ddb89dc139cc
- https://git.kernel.org/stable/c/c9ea57c91f03bcad415e1a20113bdb2077bcf990
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49855
- https://nvd.nist.gov/vuln/detail/CVE-2024-49855
- https://launchpad.net/bugs/cve/CVE-2024-49855
- https://security-tracker.debian.org/tracker/CVE-2024-49855
- https://ubuntu.com/security/CVE-2024-49855
- https://git.kernel.org/linus/c9ea57c91f03bcad415e1a20113bdb2077bcf990
Frequently Asked Questions
What is the severity of CVE-2024-49855?
CVE-2024-49855 has been rated with a medium severity due to its potential to lead to use-after-free conditions.
How do I fix CVE-2024-49855?
To fix CVE-2024-49855, upgrade the Linux kernel to a version that includes the patch addressing this vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-49855?
CVE-2024-49855 affects various versions of the Linux kernel between 5.17.15 and 6.11.2.
What type of vulnerability is CVE-2024-49855?
CVE-2024-49855 is a race condition vulnerability linked to the handling of request timeouts in the nbd module.
Can CVE-2024-49855 lead to remote exploitation?
CVE-2024-49855 could potentially be exploited remotely due to its nature of affecting command requests in the Linux kernel.
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