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kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()

🗓️ 12 Apr 2017 10:51:03Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Race condition in the N_HLDC driver can cause double free via n_hdlc.tbuf, enabling privilege escalation by unprivileged users setting HDLC on a tty.

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28 Oct 202017:16
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IBM Security Bulletins		Security Bulletin: Vulnerabilities in the Linux kernel affect PowerKVM
18 Jun 201801:38
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IBM Security Bulletins		Security Bulletin: IBM QRadar Network Security is affected by vulnerabilities in Linux kernel
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ArchLinux		[ASA-201703-13] linux-zen: privilege escalation
16 Mar 201700:00
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ArchLinux		[ASA-201703-6] linux-lts: privilege escalation
12 Mar 201700:00
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ArchLinux		[ASA-201703-7] linux-grsec: privilege escalation
13 Mar 201700:00
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ArchLinux		[ASA-201703-8] linux: privilege escalation
14 Mar 201700:00
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Information Security Automation		Why you can’t update it all at once?
22 Apr 201720:25
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Broadcom		BSA-2017-285
17 May 201700:00
–broadcom
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux6x86_64kernel-rt1:3.10.0-514.rt56.219.el6rtkernel-rt-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-debug1:3.10.0-514.rt56.219.el6rtkernel-rt-debug-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-debug-debuginfo1:3.10.0-514.rt56.219.el6rtkernel-rt-debug-debuginfo-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-debug-devel1:3.10.0-514.rt56.219.el6rtkernel-rt-debug-devel-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-debuginfo1:3.10.0-514.rt56.219.el6rtkernel-rt-debuginfo-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-debuginfo-common-x86_641:3.10.0-514.rt56.219.el6rtkernel-rt-debuginfo-common-x86_64-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-devel1:3.10.0-514.rt56.219.el6rtkernel-rt-devel-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
Red Hat Enterprise Linux6anykernel-rt-doc1:3.10.0-514.rt56.219.el6rt.noarchkernel-rt-doc-1:3.10.0-514.rt56.219.el6rt.noarch.noarch.rpm
Red Hat Enterprise Linux6anykernel-rt-firmware1:3.10.0-514.rt56.219.el6rt.noarchkernel-rt-firmware-1:3.10.0-514.rt56.219.el6rt.noarch.noarch.rpm
Red Hat Enterprise Linux6x86_64kernel-rt-trace1:3.10.0-514.rt56.219.el6rtkernel-rt-trace-1:3.10.0-514.rt56.219.el6rt.x86_64.rpm
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30 Jun 2026 11:41Current
6.6Medium risk
Vulners AI Score6.6
CVSS 26.9
CVSS 3.17
EPSS0.01029
CWE-362
n_hdlc drivertbuf listdouble freeprivilege escalationtty deviceunprivileged userhdlc line discipline
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