{"id":"DEBIAN-CVE-2023-52924","details":"In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_tables: don't skip expired elements during walk  There is an asymmetry between commit/abort and preparation phase if the following conditions are met:  1. set is a verdict map (\"1.2.3.4 : jump foo\") 2. timeouts are enabled  In this case, following sequence is problematic:  1. element E in set S refers to chain C 2. userspace requests removal of set S 3. kernel does a set walk to decrement chain-\u003euse count for all elements    from preparation phase 4. kernel does another set walk to remove elements from the commit phase    (or another walk to do a chain-\u003euse increment for all elements from     abort phase)  If E has already expired in 1), it will be ignored during list walk, so its use count won't have been changed.  Then, when set is culled, -\u003edestroy callback will zap the element via nf_tables_set_elem_destroy(), but this function is only safe for elements that have been deactivated earlier from the preparation phase: lack of earlier deactivate removes the element but leaks the chain use count, which results in a WARN splat when the chain gets removed later, plus a leak of the nft_chain structure.  Update pipapo_get() not to skip expired elements, otherwise flush command reports bogus ENOENT errors.","modified":"2026-09-15T09:03:01.685115856Z","published":"2025-02-05T10:15:21.073Z","upstream":["CVE-2023-52924"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-52924"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.64-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52924.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.11-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52924.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.4.11-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52924.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}