FKIE_CVE-2026-23392

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-03-25 15:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e3955b282eae20d61c75e499c75eade51c20060
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/adee3436ccd29f1e514c028899e400cbc6d84065
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8092edb9a11f20f95ccceeb9422b7dd0df337bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2632de96ccb066e0131ad1494241b9c281c60b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d73f4b53aaaea4c95f245e491aa5eeb8a21874ce
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e78a2dcc7cfb87b64a631441ca7681492b347ef6
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: release flowtable after rcu grace period on error\n\nCall synchronize_rcu() after unregistering the hooks from error path,\nsince a hook that already refers to this flowtable can be already\nregistered, exposing this flowtable to packet path and nfnetlink_hook\ncontrol plane.\n\nThis error path is rare, it should only happen by reaching the maximum\nnumber hooks or by failing to set up to hardware offload, just call\nsynchronize_rcu().\n\nThere is a check for already used device hooks by different flowtable\nthat could result in EEXIST at this late stage. The hook parser can be\nupdated to perform this check earlier to this error path really becomes\nrarely exercised.\n\nUncovered by KASAN reported as use-after-free from nfnetlink_hook path\nwhen dumping hooks."
    }
  ],
  "id": "CVE-2026-23392",
  "lastModified": "2026-03-25T15:41:33.977",
  "metrics": {},
  "published": "2026-03-25T11:16:39.873",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7e3955b282eae20d61c75e499c75eade51c20060"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/adee3436ccd29f1e514c028899e400cbc6d84065"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c8092edb9a11f20f95ccceeb9422b7dd0df337bd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d2632de96ccb066e0131ad1494241b9c281c60b8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d73f4b53aaaea4c95f245e491aa5eeb8a21874ce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e78a2dcc7cfb87b64a631441ca7681492b347ef6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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