{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-39894", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-39894", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-10-01T07:42:43.126Z", "updatedAt": "2026-10-15T22:02:32.869Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "netfilter: br_netfilter: do not check confirmed bit in br_nf_local_in() after confirm", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: br_netfilter: do not check confirmed bit in br_nf_local_in() after confirm\n\nWhen send a broadcast packet to a tap device, which was added to a bridge,\nbr_nf_local_in() is called to confirm the conntrack. If another conntrack\nwith the same hash value is added to the hash table, which can be\ntriggered by a normal packet to a non-bridge device, the below warning\nmay happen.\n\n ------------[ cut here ]------------\n WARNING: CPU: 1 PID: 96 at net/bridge/br_netfilter_hooks.c:632 br_nf_local_in+0x168/0x200\n CPU: 1 UID: 0 PID: 96 Comm: tap_send Not tainted 6.17.0-rc2-dirty #44 PREEMPT(voluntary)\n RIP: 0010:br_nf_local_in+0x168/0x200\n Call Trace:\n \n nf_hook_slow+0x3e/0xf0\n br_pass_frame_up+0x103/0x180\n br_handle_frame_finish+0x2de/0x5b0\n br_nf_hook_thresh+0xc0/0x120\n br_nf_pre_routing_finish+0x168/0x3a0\n br_nf_pre_routing+0x237/0x5e0\n br_handle_frame+0x1ec/0x3c0\n __netif_receive_skb_core+0x225/0x1210\n __netif_receive_skb_one_core+0x37/0xa0\n netif_receive_skb+0x36/0x160\n tun_get_user+0xa54/0x10c0\n tun_chr_write_iter+0x65/0xb0\n vfs_write+0x305/0x410\n ksys_write+0x60/0xd0\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \n ---[ end trace 0000000000000000 ]---\n\nTo solve the hash conflict, nf_ct_resolve_clash() try to merge the\nconntracks, and update skb->_nfct. However, br_nf_local_in() still use the\nold ct from local variable 'nfct' after confirm(), which leads to this\nwarning.\n\nIf confirm() does not insert the conntrack entry and return NF_DROP, the\nwarning may also occur. There is no need to reserve the WARN_ON_ONCE, just\nremove it.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "7c3f28599652acf431a2211168de4a583f30b6d5", "status": "affected", "versionType": "git", "lessThan": "d00c8b0daf56012f69075e3377da67878c775e4c" }, { "version": "2b1414d5e94e477edff1d2c79030f1d742625ea0", "status": "affected", "versionType": "git", "lessThan": "ccbad4803225eafe0175d3cb19f0d8d73b504a94" }, { "version": "80cd0487f630b5382734997c3e5e3003a77db315", "status": "affected", "versionType": "git", "lessThan": "50db11e2bbb635e38e3dd096215580d6adb41fb0" }, { "version": "62e7151ae3eb465e0ab52a20c941ff33bb6332e9", "status": "affected", "versionType": "git", "lessThan": "c47ca77fee9071aa543bae592dd2a384f895c8b6" }, { "version": "62e7151ae3eb465e0ab52a20c941ff33bb6332e9", "status": "affected", "versionType": "git", "lessThan": "a74abcf0f09f59daeecf7a3ba9c1d690808b0afe" }, { "version": "62e7151ae3eb465e0ab52a20c941ff33bb6332e9", "status": "affected", "versionType": "git", "lessThan": "479a54ab92087318514c82428a87af2d7af1a576" }, { "version": "cb734975b0ffa688ff6cc0eed463865bf07b6c01", "status": "affected", "versionType": "git" }, { "version": "5.15.151", "status": "affected", "versionType": "semver", "lessThan": "5.15.192" }, { "version": "6.1.81", "status": "affected", "versionType": "semver", "lessThan": "6.1.151" }, { "version": "6.6.21", "status": "affected", "versionType": "semver", "lessThan": "6.6.105" }, { "version": "6.7.9", "status": "affected", "versionType": "semver", "lessThan": "6.8" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.8" }, { "version": "5.15.192", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.151", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.105", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.46", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.16.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.16.*" }, { "version": "6.17", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }