CVE-2023-1095: Null Pointer Dereference
First published: Tue Feb 28 2023(Updated: )
In nf_tables_updtable, if nf_tables_table_enable returns an error, nft_trans_destroy is called to free the transaction object. nft_trans_destroy() calls list_del(), but the transaction was never placed on a list -- the list head is all zeroes, this results in a NULL pointer dereference.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.0 | 6.0 |
| Linux kernel | <6.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.17-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2173973
- https://github.com/torvalds/linux/commit/580077855a40741cf511766129702d97ff02f4d9
- https://launchpad.net/bugs/cve/CVE-2023-1095
- https://lore.kernel.org/netfilter-devel/20220809163402.20227-1-fw@strlen.de/
- https://access.redhat.com/errata/RHSA-2023:2951
- https://access.redhat.com/errata/RHSA-2023:2736
- https://access.redhat.com/errata/RHSA-2022:8267
- https://access.redhat.com/errata/RHSA-2022:7933
- https://access.redhat.com/errata/RHSA-2023:5628
- https://access.redhat.com/errata/RHSA-2023:5627
- https://access.redhat.com/errata/RHSA-2023:6813
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1095
- https://nvd.nist.gov/vuln/detail/CVE-2023-1095
- https://security-tracker.debian.org/tracker/CVE-2023-1095
- https://ubuntu.com/security/CVE-2023-1095
- https://git.kernel.org/linus/580077855a40741cf511766129702d97ff02f4d9
Frequently Asked Questions
What is the severity of CVE-2023-1095?
CVE-2023-1095 has been classified as a high severity vulnerability due to the potential for NULL pointer dereference leading to denial of service.
How do I fix CVE-2023-1095?
To mitigate CVE-2023-1095, update to the recommended fixed kernel versions provided by your distribution, such as Red Hat or Debian.
What software is affected by CVE-2023-1095?
CVE-2023-1095 affects various kernel versions in Linux distributions such as Red Hat Enterprise Linux 8.0 and 9.0 and certain Debian kernel packages.
What is the cause of CVE-2023-1095?
CVE-2023-1095 is caused by an error in nf_tables_updtable leading to nft_trans_destroy calling list_del() on a transaction object not correctly placed on a list.
Can CVE-2023-1095 be exploited remotely?
Yes, CVE-2023-1095 may be exploited remotely if the affected system is configured to process nf_tables transactions that trigger the vulnerability.
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