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CVE-2026-43190

🗓️ 06 May 2026 11:27:59Reported by LinuxType 
cve
 cve
🔗 web.nvd.nist.gov👁 77 Views🌐 WEB

CVE-2026-43190 fixes an out-of-bounds read in netfilter xt_tcpmss TCP option parsing.

Related
Detection
Affected
Refs
Paths
NVD
Vulners
CNA
Node
OR
linuxlinux_kernelRange2.6.12.1–5.10.252
linuxlinux_kernelRange5.11–5.15.202
linuxlinux_kernelRange5.16–6.1.165
linuxlinux_kernelRange6.2–6.6.128
linuxlinux_kernelRange6.7–6.12.75
linuxlinux_kernelRange6.13–6.18.16
linuxlinux_kernelRange6.19–6.19.6
linuxlinux_kernelMatch2.6.12-
linuxlinux_kernelMatch2.6.12rc2
linuxlinux_kernelMatch2.6.12rc3
linuxlinux_kernelMatch2.6.12rc4
linuxlinux_kernelMatch2.6.12rc5
linuxlinux_kernelMatch2.6.12rc6
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/netfilter/xt_tcpmss.c"
    ],
    "versions": [
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "f895191dc32c53eaf443b6443fe40945b2f92287",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "cd5beda7e0e32865e214f28034bb92c1cecff885",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "eaedc0bc18be46fe7f58170e967959a932c4f824",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "07a9b32eaae792ff7d0fcac14d8920c937c0a9c3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "8b300f726640c48c3edfe9c453334dd801f4b74e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "5e13d0a37666955b6cfddc0f73cb40ed645b8a05",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "f6c412dcfd76b0516d51aa847d8f4c7b70381b09",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
        "lessThan": "735ee8582da3d239eb0c7a53adca61b79fb228b3",
        "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/netfilter/xt_tcpmss.c"
    ],
    "versions": [
      {
        "version": "2.6.12",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.12",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.252",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.202",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.165",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.128",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.75",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.16",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.6",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
oppathnet/netfilter/xt_tcpmss.cOut-of-bounds read in TCP option parsing due to accessing op[i+1] without validating the remaining option length (optlen).CWE-125
optlenpathnet/netfilter/xt_tcpmss.cOut-of-bounds read in TCP option parsing due to accessing op[i+1] without validating the remaining option length (optlen).CWE-125
ipathnet/netfilter/xt_tcpmss.cOut-of-bounds read in TCP option parsing due to accessing op[i+1] without validating the remaining option length (optlen).CWE-125

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05 Aug 2026 12:26Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.18.2
EPSS0.00633
77