CVE-2021-3739: Null Pointer Dereference
First published: Thu Aug 26 2021(Updated: )
A NULL pointer dereference flaw was found in btrfs_rm_device function in fs/btrfs/volumes.c in Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This could allow a local attacker to crash the system or leak kernel internal information. References: <a href="https://lore.kernel.org/linux-btrfs/CAFcO6XO5TC5sEo-C9JGC75JkNAzkOSSLA3a=bwQqXFFbRTZ7Gw@mail.gmail.com/T/#md4b850f33616b7364f86e6fed144abc925f3669c">https://lore.kernel.org/linux-btrfs/CAFcO6XO5TC5sEo-C9JGC75JkNAzkOSSLA3a=bwQqXFFbRTZ7Gw@mail.gmail.com/T/#md4b850f33616b7364f86e6fed144abc925f3669c</a> <a href="https://lore.kernel.org/linux-btrfs/20210806102415.304717-1-wqu@suse.com/T/#u">https://lore.kernel.org/linux-btrfs/20210806102415.304717-1-wqu@suse.com/T/#u</a>
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 | |
| Linux Kernel | <=5.14.20 | |
| Fedora | =34 | |
| netapp h300s firmware | ||
| netapp h300s | ||
| NetApp H500S Firmware | ||
| netapp h500s | ||
| netapp h700s firmware | ||
| netapp h700s | ||
| netapp h300e firmware | ||
| netapp h300e | ||
| netapp h500e firmware | ||
| netapp h500e | ||
| netapp h700e firmware | ||
| netapp h700e | ||
| netapp h410s firmware | ||
| netapp h410s | ||
| netapp h410c firmware | ||
| netapp h410c | ||
| All of | ||
| netapp h300s firmware | ||
| netapp h300s | ||
| All of | ||
| NetApp H500S Firmware | ||
| netapp h500s | ||
| All of | ||
| netapp h700s firmware | ||
| netapp h700s | ||
| All of | ||
| netapp h300e firmware | ||
| netapp h300e | ||
| All of | ||
| netapp h500e firmware | ||
| netapp h500e | ||
| All of | ||
| netapp h700e firmware | ||
| netapp h700e | ||
| All of | ||
| netapp h410s firmware | ||
| netapp h410s | ||
| All of | ||
| netapp h410c firmware | ||
| netapp h410c | ||
| NetApp Baseboard Management Controller Firmware | ||
| netapp baseboard management controller h300s | ||
| NetApp Baseboard Management Controller Firmware | ||
| netapp baseboard management controller h500s | ||
| NetApp Baseboard Management Controller Firmware | ||
| netapp baseboard management controller h700s | ||
| NetApp Baseboard Management Controller Firmware | ||
| netapp baseboard management controller h300e | ||
| netapp baseboard management controller h500e firmware | ||
| netapp baseboard management controller h500e | ||
| netapp baseboard management controller h700e firmware | ||
| netapp baseboard management controller h700e | ||
| NetApp Baseboard Management Controller Firmware | ||
| netapp baseboard management controller h410s | ||
| netapp baseboard management controller h410c firmware | ||
| netapp baseboard management controller h410c |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1997958
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091
- https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091
- https://security.netapp.com/advisory/ntap-20220407-0006/
- https://ubuntu.com/security/CVE-2021-3739
- https://www.openwall.com/lists/oss-security/2021/08/25/3
- https://launchpad.net/bugs/cve/CVE-2021-3739
- https://lore.kernel.org/linux-btrfs/CAFcO6XO5TC5sEo-C9JGC75JkNAzkOSSLA3a=bwQqXFFbRTZ7Gw@mail.gmail.com/T/#md4b850f33616b7364f86e6fed144abc925f3669c
- https://lore.kernel.org/linux-btrfs/20210806102415.304717-1-wqu@suse.com/T/#u
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1997960
- https://access.redhat.com/security/cve/cve-2021-3739
- https://security-tracker.debian.org/tracker/CVE-2021-3739
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3739
- https://nvd.nist.gov/vuln/detail/CVE-2021-3739
Frequently Asked Questions
What is the severity of CVE-2021-3739?
CVE-2021-3739 has a severity level that allows local attackers to crash the system or potentially leak sensitive kernel information.
How do I fix CVE-2021-3739?
To fix CVE-2021-3739, it is recommended to upgrade to a patched version of the Linux kernel, specifically 5.10.223-1, 5.10.226-1, or later.
Who is affected by CVE-2021-3739?
CVE-2021-3739 affects users running vulnerable Linux kernel versions up to 5.14.20 and certain NetApp firmware versions.
What causes CVE-2021-3739?
CVE-2021-3739 is caused by a NULL pointer dereference flaw in the btrfs_rm_device function within the Linux kernel.
Can CVE-2021-3739 be exploited remotely?
CVE-2021-3739 cannot be exploited remotely as it requires local access with CAP_SYS_ADMIN capabilities.
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-3739
- agent/author
- agent/severity
- agent/weakness
- collector/mitre-cve
- source/MITRE
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- collector/usn-cve
- source/Ubuntu
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- agent/trending
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- collector/security-tracker-debian
- source/Debian
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- agent/event
- collector/nvd-api
- agent/software-canonical-lookup-request
- collector/nvd-cve
- source/NVD
- collector/nvd-index
- package-manager/debian
- vendor/linux
- canonical/linux kernel
- version/linux kernel/5.14.20
- vendor/fedoraproject
- canonical/fedora
- version/fedora/34
- vendor/netapp
- canonical/netapp h300s firmware
- canonical/netapp h300s
- canonical/netapp h500s firmware
- canonical/netapp h500s
- canonical/netapp h700s firmware
- canonical/netapp h700s
- canonical/netapp h300e firmware
- canonical/netapp h300e
- canonical/netapp h500e firmware
- canonical/netapp h500e
- canonical/netapp h700e firmware
- canonical/netapp h700e
- canonical/netapp h410s firmware
- canonical/netapp h410s
- canonical/netapp h410c firmware
- canonical/netapp h410c
- canonical/netapp baseboard management controller firmware
- canonical/netapp baseboard management controller h300s
- canonical/netapp baseboard management controller h500s
- canonical/netapp baseboard management controller h700s
- canonical/netapp baseboard management controller h300e
- canonical/netapp baseboard management controller h500e firmware
- canonical/netapp baseboard management controller h500e
- canonical/netapp baseboard management controller h700e firmware
- canonical/netapp baseboard management controller h700e
- canonical/netapp baseboard management controller h410s
- canonical/netapp baseboard management controller h410c firmware
- canonical/netapp baseboard management controller h410c