298 lines
17 KiB
JSON
298 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-2026-74660",
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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": "2026-08-15T05:44:03.924Z",
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"datePublished": "2026-08-22T15:32:33.677Z",
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"dateUpdated": "2026-10-16T19:16:07.659Z"
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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": "2026-08-25T05:41:14.285Z"
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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: ebt_nflog: pin the NFLOG backend\n\nnf_log_unregister() runs after the per-net teardown so its final RCU\ngrace period also drains readers that obtained the logger from a per-net\nbinding. However, ebt_nflog passes an explicit ULOG log type to\nnf_log_packet() without holding a reference on the selected logger module,\nunlike the xt_NFLOG and nft_log frontends.\n\nAn ebtables nflog rule can therefore remain callable while nfnetlink_log\nis unloaded. The resulting interleaving is:\n\n CPU 0 CPU 1\n nfnetlink_log_fini()\n unregister_pernet_subsys()\n kfree(nfnl_log_pernet(net))\n ebt_nflog_tg()\n nf_log_packet()\n nfulnl_log_packet()\n instance_lookup_get_rcu()\n\nThe global ULOG logger is still registered at this point, so CPU 1\ndereferences the per-net state after CPU 0 has freed it. KASAN reported:\n\n BUG: KASAN: slab-use-after-free in instance_lookup_get_rcu\n Read of size 8 at addr ff110001052e6210 by task poc/92\n Call Trace:\n instance_lookup_get_rcu+0x1ce/0x1f0 [nfnetlink_log]\n nfulnl_log_packet+0x248/0x2fb0 [nfnetlink_log]\n nf_log_packet+0x204/0x300\n ebt_nflog_tg+0x351/0x550\n ebt_do_table+0xedf/0x22b0\n Allocated by task 90:\n __kmalloc_noprof+0x186/0x470\n ops_init+0x6d/0x420\n register_pernet_operations+0x2f6/0x670\n register_pernet_subsys+0x23/0x40\n Freed by task 93:\n kfree+0x131/0x3c0\n ops_undo_list+0x3e3/0x700\n unregister_pernet_operations+0x232/0x490\n unregister_pernet_subsys+0x1c/0x30\n nfnetlink_log_fini+0x34/0x450 [nfnetlink_log]\n\nAcquire the ULOG logger module reference when an ebt_nflog rule is\nvalidated and release it when the rule is destroyed. Request the NFLOG\nbackend for legacy callers when needed, matching xt_NFLOG. This prevents\nmodule teardown until all ebt_nflog rules have stopped using the logger."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The UAF is reached through ebtables setsockopt rule installation and nfnetlink_log module teardown (local administrative paths); per kernel CNA guidance, netfilter/ebtables bugs are scored Local even when bridge hook evaluation can be driven by forwarded frames.\nAC:L - The KASAN reproducer uses a deterministic two-thread race between nfnetlink_log_fini() module removal and concurrent bridge traffic through an active ebt_nflog rule; the attacker controls both the unload timing and packet generation without depending on uncontrollable victim state.\nPR:L - Installing an ebt_nflog rule requires CAP_NET_ADMIN in the socket network namespace, obtainable by unprivileged users via user+network namespaces (unshare -Urn); the documented PoC races module teardown concurrently with rule-driven traffic, matching standard CNA treatment for ebtables/netfilter paths.\nUI:N - No victim interaction is required beyond the attacker's own ebtables configuration, module unload coordination, and bridge traffic generation to hit the active nflog target during the teardown window.\nS:U - The slab use-after-free corrupts host kernel memory within the same security authority; this is not a VM escape, container breakout across an IOMMU boundary, or other cross-scope privilege transition.\nC:H - KASAN confirmed a slab use-after-free read in instance_lookup_get_rcu() against freed nfnl_log_pernet state; UAF on the per-net instance hash table enables attacker-influenced heap reads and disclosure of adjacent kernel memory contents.\nI:H - Use-after-free on the nfnl_log_pernet structure and nfulnl_instance objects provides standard heap grooming primitives; freed slab reuse can redirect subsequent logging operations into attacker-controlled data for arbitrary kernel writes or control-flow hijack.\nA:H - The UAF read on freed per-net logging state can immediately trigger a kernel BUG/oops (as reported by KASAN) and reliably causes denial of service; repeated bridge traffic during module teardown can panic the affected host."
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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/netfilter/ebt_nflog.c"
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],
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"versions": [
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{
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"version": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "3bcce49d617c593c7606083bfdb464a1761fa68d",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "394d7939c6b2b9e6bea0844c89efb5913168d898",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "2cac4294f184c9bc19ff82552c62b80498694c39",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "9d8a94b48b393885e7f876c8ef68ed4da5012078",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "6809379a860b9fccbb5435bf08343f6d081ac68d",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "47a119ec8a7e2d5c8c4e86fb1a56c4e696e500fb",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "e2ab7e878bdbe80104c879c31fd2d82a476703b8",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "30825970339c107bacaf7f61af90fcdb1f597ca1",
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"status": "affected",
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"versionType": "git"
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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/netfilter/ebt_nflog.c"
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],
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"versions": [
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{
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"version": "4.12",
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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": "4.12",
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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": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.152",
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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": "6.12.104",
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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": "6.18.45",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.12",
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"versionEndExcluding": "5.10.265"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3bcce49d617c593c7606083bfdb464a1761fa68d"
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},
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{
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"url": "https://git.kernel.org/stable/c/394d7939c6b2b9e6bea0844c89efb5913168d898"
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},
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{
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"url": "https://git.kernel.org/stable/c/2cac4294f184c9bc19ff82552c62b80498694c39"
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},
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{
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"url": "https://git.kernel.org/stable/c/9d8a94b48b393885e7f876c8ef68ed4da5012078"
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},
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{
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"url": "https://git.kernel.org/stable/c/6809379a860b9fccbb5435bf08343f6d081ac68d"
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},
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{
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"url": "https://git.kernel.org/stable/c/47a119ec8a7e2d5c8c4e86fb1a56c4e696e500fb"
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},
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{
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"url": "https://git.kernel.org/stable/c/e2ab7e878bdbe80104c879c31fd2d82a476703b8"
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},
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{
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"url": "https://git.kernel.org/stable/c/30825970339c107bacaf7f61af90fcdb1f597ca1"
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}
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],
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"title": "netfilter: ebt_nflog: pin the NFLOG backend",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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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-2026-74660",
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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": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:14:02.258811Z"
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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": "2026-10-16T19:16:07.659Z"
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}
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}
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]
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}
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} |