CVE-2026-64538

🗓️ 27 Jul 2026 20:10:32Reported by LinuxType

Fix null pointer dereference in fib6_nh_mtu_change by returning zero when idev is NULL.

Reporter	Title	Published	Views	Family All 9
Cvelist	CVE-2026-64538 ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().	27 Jul 202620:10	–	cvelist
Debian CVE	CVE-2026-64538	27 Jul 202620:10	–	debiancve
EUVD	EUVD-2026-49589	27 Jul 202620:10	–	euvd
NVD	CVE-2026-64538	27 Jul 202621:17	–	nvd
OSV	CVE-2026-64538 ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().	27 Jul 202620:10	–	osv
OSV	DEBIAN-CVE-2026-64538	27 Jul 202621:17	–	osv
OSV	UBUNTU-CVE-2026-64538	28 Jul 202600:00	–	osv
Positive Technologies	PT-2026-65213	27 Jul 202600:00	–	ptsecurity
RedhatCVE	CVE-2026-64538	28 Jul 202615:07	–	redhatcve

Vulners

CNA

Node

linux linux_kernelRange5.3–5.10.261

linux linux_kernelRange5.11.0–5.15.212

linux linux_kernelRange5.16.0–6.1.178

linux linux_kernelRange6.2.0–6.6.145

linux linux_kernelRange6.7.0–6.12.97

linux linux_kernelRange6.13.0–6.18.40

linux linux_kernelRange6.19.0–7.1.5

linux linux_kernelRange7.2.0–7.2-rc1

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/route.c"
    ],
    "versions": [
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "d08d019f2f43a6f9a71e81868bbc326b3afaf37b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "1451deca9896957159f0666520a792c1b861af4f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "b2c70dd3326809429b709a9c7e9220d29923051a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "302d57ed7872838b40e56a868fb4c7da7da606e9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "80600b5d0f3ecb9324120dc95b5e915130f516c5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "b0d0eb13a0441a8ebf4f227843deaf494f1e2c33",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "6428634f7a0b7878144b4925c37856bef3224967",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c0b220cf7d80eb8a36ae9f12cae6df4577a6814e",
        "lessThan": "46c3b8191aad3d032776bf3bebf03efdf5f4b905",
        "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/ipv6/route.c"
    ],
    "versions": [
      {
        "version": "5.3",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.3",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.261",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.212",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.178",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.145",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.97",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.40",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.5",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

Source	Link
git	www.git.kernel.org/stable/c/1451deca9896957159f0666520a792c1b861af4f
git	www.git.kernel.org/stable/c/302d57ed7872838b40e56a868fb4c7da7da606e9
git	www.git.kernel.org/stable/c/b0d0eb13a0441a8ebf4f227843deaf494f1e2c33
git	www.git.kernel.org/stable/c/80600b5d0f3ecb9324120dc95b5e915130f516c5
git	www.git.kernel.org/stable/c/6428634f7a0b7878144b4925c37856bef3224967
git	www.git.kernel.org/stable/c/b2c70dd3326809429b709a9c7e9220d29923051a
git	www.git.kernel.org/stable/c/46c3b8191aad3d032776bf3bebf03efdf5f4b905
git	www.git.kernel.org/stable/c/d08d019f2f43a6f9a71e81868bbc326b3afaf37b

27 Jul 2026 21:17Current

5.7Medium risk

Vulners AI Score5.7