CVE-2026-23231
- Source
- https://cve.org/CVERecord?id=CVE-2026-23231
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-23231.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-23231
- Downstream
- Related
- Published
- 2026-03-04T12:58:42.029Z
- Modified
- 2026-05-18T05:59:43.946193659Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- netfilter: nf_tables: fix use-after-free in nf_tables_addchain()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nftables: fix use-after-free in nftables_addchain()
nftablesaddchain() publishes the chain to table->chains via listaddtailrcu() (in nftchainadd()) before registering hooks. If nftablesregisterhook() then fails, the error path calls nftchaindel() (listdelrcu()) followed by nftableschain_destroy() with no RCU grace period in between.
This creates two use-after-free conditions:
1) Control-plane: nftablesdumpchains() traverses table->chains under rcuread_lock(). A concurrent dump can still be walking the chain when the error path frees it.
2) Packet path: for NFPROTOINET, nfregisternethook() briefly installs the IPv4 hook before IPv6 registration fails. Packets entering nftdochain() via the transient IPv4 hook can still be dereferencing chain->blobgenX when the error path frees the chain.
Add synchronizercu() between nftchain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23231.json" }- References
-
- https://git.kernel.org/stable/c/2a6586ecfa4ce1413daaafee250d2590e05f1a33
- https://git.kernel.org/stable/c/2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b
- https://git.kernel.org/stable/c/7017745068a9068904e1e7a1b170a5785647cc81
- https://git.kernel.org/stable/c/71e99ee20fc3f662555118cf1159443250647533
- https://git.kernel.org/stable/c/dbd0af8083dd201f07c49110b2ee93710abdff28
- https://git.kernel.org/stable/c/f3fe58ce37926a10115ede527d59b91bcc05400a
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23231.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-23231
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced91c7b38dc9f0de4f7f444b796d14476bc12df7bcFixed2a6586ecfa4ce1413daaafee250d2590e05f1a33Fixed7017745068a9068904e1e7a1b170a5785647cc81Fixedf3fe58ce37926a10115ede527d59b91bcc05400aFixeddbd0af8083dd201f07c49110b2ee93710abdff28Fixed2f9a4ffeb763aec822f8ff3d1e82202d27d46d4bFixed71e99ee20fc3f662555118cf1159443250647533