CVE-2020-29661: Use After Free
First published: Fri Dec 04 2020(Updated: )
A locking issue was discovered in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c which could allow an attacker with a local account to possibly corrupt memory or escalate privileges. Reference and upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <0:2.6.32-754.39.1.el6 | 0:2.6.32-754.39.1.el6 |
| redhat/kernel-rt | <0:3.10.0-1160.21.1.rt56.1158.el7 | 0:3.10.0-1160.21.1.rt56.1158.el7 |
| redhat/kernel-alt | <0:4.14.0-115.35.1.el7a | 0:4.14.0-115.35.1.el7a |
| redhat/kernel | <0:3.10.0-1160.21.1.el7 | 0:3.10.0-1160.21.1.el7 |
| redhat/kernel | <0:3.10.0-693.87.1.el7 | 0:3.10.0-693.87.1.el7 |
| redhat/kernel | <0:3.10.0-957.70.1.el7 | 0:3.10.0-957.70.1.el7 |
| redhat/kernel | <0:3.10.0-1062.46.1.el7 | 0:3.10.0-1062.46.1.el7 |
| redhat/kernel-rt | <0:4.18.0-240.15.1.rt7.69.el8_3 | 0:4.18.0-240.15.1.rt7.69.el8_3 |
| redhat/kernel | <0:4.18.0-240.15.1.el8_3 | 0:4.18.0-240.15.1.el8_3 |
| redhat/kernel | <0:4.18.0-147.43.1.el8_1 | 0:4.18.0-147.43.1.el8_1 |
| redhat/kernel-rt | <0:4.18.0-193.46.1.rt13.96.el8_2 | 0:4.18.0-193.46.1.rt13.96.el8_2 |
| redhat/kernel | <0:4.18.0-193.46.1.el8_2 | 0:4.18.0-193.46.1.el8_2 |
| Android | ||
| Linux Kernel | >=2.6.26<4.4.248 | |
| Linux Kernel | >=4.5<4.9.248 | |
| Linux Kernel | >=4.10<4.14.212 | |
| Linux Kernel | >=4.15<4.19.163 | |
| Linux Kernel | >=4.20<5.4.83 | |
| Linux Kernel | >=5.5<5.9.14 | |
| Red Hat Fedora | =32 | |
| Red Hat Fedora | =33 | |
| Debian Linux | =9.0 | |
| Debian Linux | =10.0 | |
| NetApp Active IQ Unified Manager for VMware vSphere | ||
| Broadcom Fabric Operating System | ||
| All of | ||
| NetApp SolidFire Baseboard Management Controller Firmware | ||
| NetApp SolidFire | ||
| All of | ||
| NetApp H410C | ||
| NetApp H410C Firmware | ||
| All of | ||
| NetApp AFF A700s Firmware | ||
| NetApp A700 | ||
| All of | ||
| NetApp AFF 8300 Firmware | ||
| NetApp FAS8300 | ||
| All of | ||
| NetApp AFF 8700 Firmware | ||
| NetApp FAS8700 | ||
| All of | ||
| NetApp AFF A400 Firmware | ||
| NetApp FAS A400 | ||
| Oracle Tekelec Platform Distribution | >=7.4.0<=7.7.1 | |
| NetApp SolidFire Baseboard Management Controller Firmware | ||
| NetApp SolidFire | ||
| NetApp H410C | ||
| NetApp H410C Firmware | ||
| NetApp AFF A700s Firmware | ||
| NetApp A700 | ||
| NetApp AFF 8300 Firmware | ||
| NetApp FAS8300 | ||
| NetApp AFF 8700 Firmware | ||
| NetApp FAS8700 | ||
| NetApp AFF A400 Firmware | ||
| NetApp FAS A400 | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
Remedy
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-29661 https://nvd.nist.gov/vuln/detail/CVE-2020-29661
- https://bugzilla.redhat.com/show_bug.cgi?id=1906525
- https://access.redhat.com/errata/RHSA-2021:1288
- https://access.redhat.com/errata/RHSA-2021:0857
- https://access.redhat.com/errata/RHSA-2021:0354
- https://access.redhat.com/errata/RHSA-2021:0856
- https://access.redhat.com/errata/RHSA-2021:0862
- https://access.redhat.com/errata/RHSA-2021:2164
- https://access.redhat.com/errata/RHSA-2021:0878
- https://access.redhat.com/errata/RHSA-2021:0940
- https://access.redhat.com/errata/RHSA-2021:1028
- https://access.redhat.com/errata/RHSA-2021:1031
- https://access.redhat.com/errata/RHSA-2021:0537
- https://access.redhat.com/errata/RHSA-2021:0558
- https://access.redhat.com/errata/RHSA-2021:0686
- https://access.redhat.com/errata/RHSA-2021:0689
- https://access.redhat.com/errata/RHSA-2021:0774
- https://access.redhat.com/errata/RHSA-2021:0763
- https://access.redhat.com/errata/RHSA-2021:0765
- https://access.redhat.com/security/cve/cve-2020-29661
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54ffccbf053b5b6ca4f6e45094b942fab92a25fc
- http://www.openwall.com/lists/oss-security/2020/12/10/1
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
- http://packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.html
- https://security.netapp.com/advisory/ntap-20210122-0001/
- https://www.debian.org/security/2021/dsa-4843
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html
- https://launchpad.net/bugs/cve/CVE-2020-29661
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1906526
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BOB25SU6XUL4TNP7KB63WNZSYTIYFDPP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZ7OAKAEFAXQRGBZK4LYUWINCD3D2XCL/
- https://android.googlesource.com/kernel/common/+/54ffccbf053b5b6ca4f6e45094b942fab92a25fc
- https://source.android.com/docs/security/bulletin/2021-05-01 (Advisory)
- https://git.kernel.org/linus/54ffccbf053b5b6ca4f6e45094b942fab92a25fc
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2125
- https://googleprojectzero.blogspot.com/2021/10/how-simple-linux-kernel-memory.html
- https://security-tracker.debian.org/tracker/CVE-2020-29661
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29661
- https://nvd.nist.gov/vuln/detail/CVE-2020-29661
- https://ubuntu.com/security/CVE-2020-29661
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2020-29661?
CVE-2020-29661 is classified as a high severity vulnerability that could allow an attacker to corrupt memory or escalate privileges.
How can I fix CVE-2020-29661?
To mitigate CVE-2020-29661, update your Linux kernel to the patched versions provided by your Linux distribution.
What versions of the Linux kernel are affected by CVE-2020-29661?
CVE-2020-29661 affects multiple versions of the Linux kernel, particularly those prior to the patched releases mentioned in your distribution's advisory.
Is CVE-2020-29661 exploitable remotely?
CVE-2020-29661 is not considered remotely exploitable; it requires local access to the affected system.
Are there any specific distributions affected by CVE-2020-29661?
Yes, CVE-2020-29661 impacts various distributions including Red Hat, Fedora, and Debian.
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