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Advisory severityMedium5.5Red Hat Linux

Medium [CVE-2023-1095] Linux kernel netfilter subsystem.: In nf_tables_updtable, if nf_tables_table_enable returns an error, nft_trans_destroy is called to free the transaction object

This medium-severity Red Hat Linux advisory covers CVE-2023-1095 affecting Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2023-1095 Source published Source updated

VulniPulse record published

CVE-2023-1095
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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.

A NULL pointer dereference flaw was found in the Linux kernel’s netfilter subsystem. This flaw allows a local, unprivileged user to crash the system, resulting in a denial of service.

Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476.

Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Telecommunications Update Service; Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.

Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2023:2736, RHSA-2023:2951, RHSA-2023:6813, RHSA-2023:5628, RHSA-2023:5627, RHSA-2022:8267, RHSA-2022:7933.

Affected products named by the advisory: Red Hat package: kernel-rt.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 10 hours ago·verify at source

Fixed versions
  • kernel-rt-0:4.18.0-477.10.1.rt7.274.el8_8
  • kernel-0:4.18.0-477.10.1.el8_8
  • kernel-0:4.18.0-147.94.1.el8_1
  • kernel-0:4.18.0-305.108.1.el8_4
  • kernel-0:4.18.0-372.75.1.el8_6
  • kernel-0:5.14.0-162.6.1.el9_1
  • kernel-rt-0:5.14.0-162.6.1.rt21.168.el9_1
  • RHSA-2023:2736
  • RHSA-2023:2951
  • RHSA-2023:6813
  • RHSA-2023:5628
  • RHSA-2023:5627
  • RHSA-2022:8267
  • RHSA-2022:7933

Official advisory · high-confidence parse· fetched 10 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • This flaw can be mitigated by preventing the affected netfilter kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

Official advisory · high-confidence parse· fetched 10 hours ago·verify at source

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