CVE-2026-46086 net: bridge: use a stable FDB dst snapshot in RCU readers

🗓️ 27 May 2026 12:58:28Reported by LinuxType

Kernel fix: local FDB updates race with reader access; use READ_ONCE snapshot and WRITE_ONCE publish.

Reporter	Title	Published	Views	Family All 44
ATTACKERKB	CVE-2026-46086	27 May 202612:58	–	attackerkb
Tenable Nessus	Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1753)	27 May 202600:00	–	nessus
Tenable Nessus	Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1754)	27 May 202600:00	–	nessus
Tenable Nessus	Linux Distros Unpatched Vulnerability : CVE-2026-46086	27 May 202600:00	–	nessus
CNNVD	Linux kernel 安全漏洞	27 May 202600:00	–	cnnvd
CVE	CVE-2026-46086	27 May 202612:58	–	cve
Debian CVE	CVE-2026-46086	27 May 202612:58	–	debiancve
EUVD	EUVD-2026-32469	27 May 202612:58	–	euvd
Microsoft CVE	net: bridge: use a stable FDB dst snapshot in RCU readers	28 May 202608:09	–	mscve
NVD	CVE-2026-46086	27 May 202614:17	–	nvd

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/bridge/br_arp_nd_proxy.c",
      "net/bridge/br_fdb.c"
    ],
    "versions": [
      {
        "version": "960b589f86c74ce582922fcb996103271081f4de",
        "lessThan": "0b9e4bbfb7c949151e3acd44ed4aa33614d2e110",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "960b589f86c74ce582922fcb996103271081f4de",
        "lessThan": "81af4137a30c4c2dc694dea8cacb180bd66000ef",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "960b589f86c74ce582922fcb996103271081f4de",
        "lessThan": "5424e678f9b304e148cf5dcc047cffc7a56a3bb5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "960b589f86c74ce582922fcb996103271081f4de",
        "lessThan": "9a2d9d4e657b23dc21f24cf139e3aeff0b61341f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "960b589f86c74ce582922fcb996103271081f4de",
        "lessThan": "df4601653201de21b487c3e7fffd464790cab808",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/bridge/br_arp_nd_proxy.c",
      "net/bridge/br_fdb.c"
    ],
    "versions": [
      {
        "version": "3.14",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "3.14",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.140",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.86",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.27",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0.4",
        "lessThanOrEqual": "7.0.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

Source	Link
git	www.git.kernel.org/stable/c/0b9e4bbfb7c949151e3acd44ed4aa33614d2e110
git	www.git.kernel.org/stable/c/81af4137a30c4c2dc694dea8cacb180bd66000ef
git	www.git.kernel.org/stable/c/9a2d9d4e657b23dc21f24cf139e3aeff0b61341f
git	www.git.kernel.org/stable/c/5424e678f9b304e148cf5dcc047cffc7a56a3bb5
git	www.git.kernel.org/stable/c/df4601653201de21b487c3e7fffd464790cab808

14 Jun 2026 17:53Current

EPSS0.00168