CVE-2023-42754: Kernel: ipv4: null pointer dereference in ipv4_send_dest_unreach()
First published: Wed Sep 20 2023(Updated: )
A flaw was found in ipv4_send_dest_unreach() due to NULL pointer derefence due to a missing edge-case check.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.6 | |
| Linux Linux kernel | =6.6-rc1 | |
| Linux Linux kernel | =6.6-rc2 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| Fedoraproject Fedora | =39 | |
| IBM Security Guardium | <=12.0 | |
| redhat/kernel | <6.6 | 6.6 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.6-1 |
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
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-42754
- https://bugzilla.redhat.com/show_bug.cgi?id=2239845
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GISYSL3F6WIEVGHJGLC2MFNTUXHPTKQH/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GPMICQ2HVZO5UAM5KPXHAZKA2U3ZDOO6/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V5PDNWPKAP3WL5RQZ4RIDS6MG32OHH5R/
- https://seclists.org/oss-sec/2023/q4/14
- https://exchange.xforce.ibmcloud.com/vulnerabilities/267500
- https://www.ibm.com/support/pages/node/7152469 (Advisory)
- https://access.redhat.com/errata/RHSA-2024:2394
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://access.redhat.com/errata/RHSA-2024:2950
- https://access.redhat.com/errata/RHSA-2024:3138
- https://launchpad.net/bugs/cve/CVE-2023-42754
- https://github.com/torvalds/linux/commit/0113d9c9d1ccc07f5a3710dac4aa24b6d711278c
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2242284
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2267759
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-42754
- https://nvd.nist.gov/vuln/detail/CVE-2023-42754
- https://security-tracker.debian.org/tracker/CVE-2023-42754
- https://ubuntu.com/security/CVE-2023-42754
- https://www.openwall.com/lists/oss-security/2023/10/02/8
- https://git.kernel.org/linus/0113d9c9d1ccc07f5a3710dac4aa24b6d711278c
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