CVE-2023-1095

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-28 · updated 2026-10-14
Weakness: CWE-476

Description

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.

Affected products

Linux kernel: before 6.0 — fixed in 6.0
Red Hat Enterprise Linux: 8.0, 9.0

How to fix

Upgrade to a fixed version: Linux kernel 6.0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=2173973
https://github.com/torvalds/linux/commit/580077855a40741cf511766129702d97ff02f4d9
https://bugzilla.redhat.com/show_bug.cgi?id=2173973
https://github.com/torvalds/linux/commit/580077855a40741cf511766129702d97ff02f4d9
https://cert-portal.siemens.com/productcert/html/ssa-794697.html

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