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kernel: tun: avoid double free in tun_free_netdev

🗓️ 27 Mar 2023 08:15:32Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 2 Views

Kernel TUN/TAP double free occurs if register_netdevice fails, risking crash or privilege escalation.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9ppc64lekpatch-patch-5_14_0-162_12_10:1-2.el9_1kpatch-patch-5_14_0-162_12_1-0:1-2.el9_1.ppc64le.rpm
Red Hat Enterprise Linux9x86_64kpatch-patch-5_14_0-162_12_10:1-2.el9_1kpatch-patch-5_14_0-162_12_1-0:1-2.el9_1.x86_64.rpm
Red Hat Enterprise Linux9ppc64lekpatch-patch-5_14_0-162_12_1-debuginfo0:1-2.el9_1kpatch-patch-5_14_0-162_12_1-debuginfo-0:1-2.el9_1.ppc64le.rpm
Red Hat Enterprise Linux9x86_64kpatch-patch-5_14_0-162_12_1-debuginfo0:1-2.el9_1kpatch-patch-5_14_0-162_12_1-debuginfo-0:1-2.el9_1.x86_64.rpm
Red Hat Enterprise Linux9ppc64lekpatch-patch-5_14_0-162_12_1-debugsource0:1-2.el9_1kpatch-patch-5_14_0-162_12_1-debugsource-0:1-2.el9_1.ppc64le.rpm
Red Hat Enterprise Linux9x86_64kpatch-patch-5_14_0-162_12_1-debugsource0:1-2.el9_1kpatch-patch-5_14_0-162_12_1-debugsource-0:1-2.el9_1.x86_64.rpm
Red Hat Enterprise Linux9ppc64lekpatch-patch-5_14_0-162_18_10:1-1.el9_1kpatch-patch-5_14_0-162_18_1-0:1-1.el9_1.ppc64le.rpm
Red Hat Enterprise Linux9x86_64kpatch-patch-5_14_0-162_18_10:1-1.el9_1kpatch-patch-5_14_0-162_18_1-0:1-1.el9_1.x86_64.rpm
Red Hat Enterprise Linux9ppc64lekpatch-patch-5_14_0-162_18_1-debuginfo0:1-1.el9_1kpatch-patch-5_14_0-162_18_1-debuginfo-0:1-1.el9_1.ppc64le.rpm
Red Hat Enterprise Linux9x86_64kpatch-patch-5_14_0-162_18_1-debuginfo0:1-1.el9_1kpatch-patch-5_14_0-162_18_1-debuginfo-0:1-1.el9_1.x86_64.rpm
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28 Jun 2026 12:38Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.17.8
EPSS0.00456
SSVC
CWE-1341
tun tapdouble freeregister netdevicekernel vulnerabilityprivilege escalation
2