{"id":"CVE-2025-38732","summary":"netfilter: nf_reject: don't leak dst refcount for loopback packets","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_reject: don't leak dst refcount for loopback packets\n\nrecent patches to add a WARN() when replacing skb dst entry found an\nold bug:\n\nWARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline]\nWARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline]\nWARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234\n[..]\nCall Trace:\n nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325\n nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27\n expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]\n ..\n\nThis is because blamed commit forgot about loopback packets.\nSuch packets already have a dst_entry attached, even at PRE_ROUTING stage.\n\nInstead of checking hook just check if the skb already has a route\nattached to it.","aliases":["ECHO-ad94-d2ee-f1c3"],"modified":"2026-04-21T02:27:11.042674988Z","published":"2025-09-05T17:20:31.934Z","related":["SUSE-SU-2025:03600-1","SUSE-SU-2025:03601-1","SUSE-SU-2025:03602-1","SUSE-SU-2025:03633-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20851-1","SUSE-SU-2025:20861-1","SUSE-SU-2025:20870-1","SUSE-SU-2025:20898-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2025:3725-1","SUSE-SU-2025:3751-1","openSUSE-SU-2025:20081-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38732.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/51e8531371f90bee742c63775c9a568e5d6bf3c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82ef97abf22790182f7d433c74960dfd61b99c33"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91a79b792204313153e1bdbbe5acbfc28903b3a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0a3ace2a57887dac1e7c9a724846040c3e31868"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b32e1590a8d22cf7d7f965e46d5576051acf8e42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7a885ba25960c91db237c3f83b4285156789bce"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38732.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38732"},{"type":"PACKAGE","url":"https://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":[{"introduced":"f53b9b0bdc59c0823679f2e3214e0d538f5951b9"},{"fixed":"7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8"},{"fixed":"82ef97abf22790182f7d433c74960dfd61b99c33"},{"fixed":"b7a885ba25960c91db237c3f83b4285156789bce"},{"fixed":"a0a3ace2a57887dac1e7c9a724846040c3e31868"},{"fixed":"51e8531371f90bee742c63775c9a568e5d6bf3c5"},{"fixed":"b32e1590a8d22cf7d7f965e46d5576051acf8e42"},{"fixed":"91a79b792204313153e1bdbbe5acbfc28903b3a5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38732.json"}}],"schema_version":"1.7.5"}