CVE-2023-4015: Use-after-free in Linux kernel's netfilter: nf_tables component
First published: Wed Sep 06 2023(Updated: )
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. On an error when building a nftables rule, deactivating immediate expressions in nft_immediate_deactivate() can lead unbinding the chain and objects be deactivated but later used. We recommend upgrading past commit 0a771f7b266b02d262900c75f1e175c7fe76fec2.
Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=6.5 | |
| Debian Debian Linux | =12.0 | |
| redhat/Kernel | <6.5 | 6.5 |
| Linux Linux kernel | >=5.9<5.10.190 | |
| Linux Linux kernel | >=5.11<5.15.124 | |
| Linux Linux kernel | >=5.16<6.1.43 | |
| Linux Linux kernel | >=6.2<6.4.8 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.6-1 6.12.9-1 |
Remedy
If not needed, disable the ability for unprivileged users to create namespaces. To do this temporarily, do: sudo sysctl -w kernel.unprivileged_userns_clone=0 To disable across reboots, do: echo kernel.unprivileged_userns_clone=0 | \ sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a771f7b266b02d262900c75f1e175c7fe76fec2
- https://kernel.dance/0a771f7b266b02d262900c75f1e175c7fe76fec2
- https://www.debian.org/security/2023/dsa-5492
- https://launchpad.net/bugs/cve/CVE-2023-4015
- https://access.redhat.com/errata/RHSA-2024:0461
- https://access.redhat.com/errata/RHSA-2024:0439
- https://access.redhat.com/errata/RHSA-2024:0448
- https://bugzilla.redhat.com/show_bug.cgi?id=2237752
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4015
- https://nvd.nist.gov/vuln/detail/CVE-2023-4015
- https://security-tracker.debian.org/tracker/CVE-2023-4015
- https://ubuntu.com/security/CVE-2023-4015
- https://git.kernel.org/linus/0a771f7b266b02d262900c75f1e175c7fe76fec2
- collector/nvd-index
- agent/type
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/weakness
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/title
- agent/remedy
- agent/references
- agent/first-publish-date
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2023-4015
- agent/software-canonical-lookup
- collector/usn-cve
- source/Ubuntu
- agent/description
- collector/nvd-api
- source/NVD
- agent/last-modified-date
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/nvd-cve
- agent/event
- agent/trending
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/6.5
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/12.0
- package-manager/redhat
- version/linux linux kernel/5.9
- version/linux linux kernel/5.11
- version/linux linux kernel/5.16
- version/linux linux kernel/6.2
- package-manager/debian