CVE-2021-3348: Race Condition
First published: Thu Jan 28 2021(Updated: )
A flaw was found in the Linux kernel. A race codition in nbd ioctl may lead to a use-after-free read in nbd_queue_rq causing a crash. Upstream patch: <a href="https://lore.kernel.org/linux-block/24dff677353e2e30a71d8b66c4dffdbdf77c4dbd.1611595239.git.josef@toxicpanda.com/">https://lore.kernel.org/linux-block/24dff677353e2e30a71d8b66c4dffdbdf77c4dbd.1611595239.git.josef@toxicpanda.com/</a> References: <a href="https://www.openwall.com/lists/oss-security/2021/01/28/3">https://www.openwall.com/lists/oss-security/2021/01/28/3</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=5.10.12 | |
| Debian Linux | =9.0 | |
| 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 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2021/02/01/1
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b98e762e3d71e893b221f871825dc64694cfb258
- https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
- https://www.openwall.com/lists/oss-security/2021/01/28/3
- https://launchpad.net/bugs/cve/CVE-2021-3348
- https://lore.kernel.org/linux-block/24dff677353e2e30a71d8b66c4dffdbdf77c4dbd.1611595239.git.josef@toxicpanda.com/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1921960
- https://access.redhat.com/solutions/41278
- https://access.redhat.com/errata/RHSA-2021:4140
- https://access.redhat.com/errata/RHSA-2021:4356
- https://bugzilla.redhat.com/show_bug.cgi?id=1921958
- https://git.kernel.org/linus/b98e762e3d71e893b221f871825dc64694cfb258
- https://security-tracker.debian.org/tracker/CVE-2021-3348
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3348
- https://nvd.nist.gov/vuln/detail/CVE-2021-3348
- https://ubuntu.com/security/CVE-2021-3348
Frequently Asked Questions
What is the severity of CVE-2021-3348?
CVE-2021-3348 has been classified as a moderate severity vulnerability.
How do I fix CVE-2021-3348?
To fix CVE-2021-3348, upgrade to a kernel version that is 5.10.223-1 or later, or 6.1.119-1 or later.
What systems are affected by CVE-2021-3348?
CVE-2021-3348 affects Linux Kernel versions up to and including 5.10.12 and Debian Linux version 9.0.
What type of vulnerability is CVE-2021-3348?
CVE-2021-3348 is a use-after-free vulnerability due to a race condition in the nbd ioctl.
Can CVE-2021-3348 lead to system crashes?
Yes, CVE-2021-3348 can lead to a system crash due to a use-after-free read in nbd_queue_rq.
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