303 lines
17 KiB
JSON
303 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-39894",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.145Z",
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"datePublished": "2025-10-01T07:42:43.126Z",
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"dateUpdated": "2026-10-15T22:02:32.869Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:05:56.359Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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 <TASK>\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 </TASK>\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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The trigger is a broadcast/multicast IP frame arriving on a bridge port and being locally delivered via br_pass_frame_up() → NF_BR_LOCAL_IN, requiring no host access at all; on the very common overlay deployments (VXLAN/GRE port enslaved to a Linux bridge in Docker overlay, k8s CNI, OpenStack) those inner broadcast frames originate from a routed, remote VTEP, making the vulnerable code reachable across layer 3.\nAC:L - The attacker drives both sides of the clash by flooding duplicate same-tuple broadcast datagrams, which the bridge itself fans out concurrently (flood to N ports plus local receive, plus a copy to a non-bridge device as noted in the commit), so two unconfirmed conntracks with an identical tuple reach __nf_conntrack_confirm() in parallel. The required br_netfilter+conntrack+bridge configuration is the default on container and virtualization hosts, not a rare option.\nPR:N - No credentials or capabilities on the target are needed — the attacker only has to get an IP broadcast/multicast frame onto a segment bridged by the victim, which is unauthenticated packet delivery.\nUI:N - No victim action is required; the bridge processes the received frames automatically in softirq context.\nS:U - The stale conntrack read and the WARNING both occur in the host kernel's own netfilter/bridge context, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - The stale read is a single unsigned long from a SLAB_TYPESAFE_BY_RCU nf_conn object and its value is consumed only by the WARN condition — it is never returned to the attacker, and the remote attacker has no channel to read the resulting dmesg splat.\nI:N - No write occurs on the stale pointer; confirm() has already repointed skb->_nfct at the surviving conntrack with a valid reference, so no kernel memory is modified and no control flow is influenced.\nA:H - The bug fires a kernel WARNING from a remotely reachable softirq path, which taints the kernel and causes an immediate panic on the many hardened, Android, ChromeOS, and cloud/CI deployments that run with panic_on_warn=1, yielding a full denial of service."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bridge/br_netfilter_hooks.c"
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],
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"versions": [
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{
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"version": "7c3f28599652acf431a2211168de4a583f30b6d5",
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"lessThan": "d00c8b0daf56012f69075e3377da67878c775e4c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2b1414d5e94e477edff1d2c79030f1d742625ea0",
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"lessThan": "ccbad4803225eafe0175d3cb19f0d8d73b504a94",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "80cd0487f630b5382734997c3e5e3003a77db315",
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"lessThan": "50db11e2bbb635e38e3dd096215580d6adb41fb0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "62e7151ae3eb465e0ab52a20c941ff33bb6332e9",
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"lessThan": "c47ca77fee9071aa543bae592dd2a384f895c8b6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "62e7151ae3eb465e0ab52a20c941ff33bb6332e9",
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"lessThan": "a74abcf0f09f59daeecf7a3ba9c1d690808b0afe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "62e7151ae3eb465e0ab52a20c941ff33bb6332e9",
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"lessThan": "479a54ab92087318514c82428a87af2d7af1a576",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cb734975b0ffa688ff6cc0eed463865bf07b6c01",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.15.151",
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"lessThan": "5.15.192",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.81",
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"lessThan": "6.1.151",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.21",
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"lessThan": "6.6.105",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.7.9",
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"lessThan": "6.8",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bridge/br_netfilter_hooks.c"
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],
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"versions": [
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{
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"version": "6.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.192",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.151",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.105",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.46",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.16.6",
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"lessThanOrEqual": "6.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"references": [
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"url": "https://git.kernel.org/stable/c/d00c8b0daf56012f69075e3377da67878c775e4c"
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},
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{
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},
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{
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"url": "https://git.kernel.org/stable/c/c47ca77fee9071aa543bae592dd2a384f895c8b6"
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},
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{
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"url": "https://git.kernel.org/stable/c/a74abcf0f09f59daeecf7a3ba9c1d690808b0afe"
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},
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{
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"url": "https://git.kernel.org/stable/c/479a54ab92087318514c82428a87af2d7af1a576"
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}
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],
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"title": "netfilter: br_netfilter: do not check confirmed bit in br_nf_local_in() after confirm",
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"x_generator": {
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"engine": "bippy-1.2.0"
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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}
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T17:44:28.733Z"
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}
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-39894",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:54:35.991421Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T22:02:32.869Z"
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}
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}
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]
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}
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} |