CVE-2020-12770: Use After Free

Published Apr 14, 2020
·
Updated

A vulnerability was found in sgwrite in drivers/scsi/sg.c in SCSI generic (sg) driver subsystem. An attacker with a local access and special user privilege (or root) can cause a denial of service (DoS) if allocated list is not cleaned with invalid (Sgfd sfp) pointer at the time of failure, failing this can even cause a kernel internal information leak problem.

Reference and upstream commit: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=83c6f2390040f188cc25b270b4befeb5628c1aee

Other sources

A vulnerability was found in sgwrite in drivers/scsi/sg.c in the SCSI generic (sg) driver subsystem. This flaw allows an attacker with local access and special user or root privileges to cause a denial of service if the allocated list is not cleaned with an invalid (Sgfd sfp) pointer at the time of failure, also possibly causing a kernel internal information leak problem.

An issue was discovered in the Linux kernel through 5.6.11. sgwrite lacks an sgremoverequest call in a certain failure case, aka CID-83c6f2390040.

— Ubuntu

Affected Software

144 affected componentsFixes available
redhat/kernel-rt<0:3.10.0-1160.rt56.1131.el7
0:3.10.0-1160.rt56.1131.el7
redhat/kernel<0:3.10.0-1160.el7
0:3.10.0-1160.el7
redhat/kernel<0:3.10.0-693.81.1.el7
0:3.10.0-693.81.1.el7
redhat/kernel<0:3.10.0-957.65.1.el7
0:3.10.0-957.65.1.el7
redhat/kernel<0:3.10.0-1062.40.1.el7
0:3.10.0-1062.40.1.el7
redhat/kernel-rt<0:4.18.0-240.rt7.54.el8
0:4.18.0-240.rt7.54.el8
redhat/kernel<0:4.18.0-240.el8
0:4.18.0-240.el8
Linux Linux kernel<=5.6.11
Fedoraproject Fedora=30
Fedoraproject Fedora=31
Fedoraproject Fedora=32
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.10
Canonical Ubuntu Linux=20.04
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
NetApp Active Iq Unified Manager Vmware Vsphere
NetApp Cloud Backup
NetApp Element Software
NetApp Hci Management Node
NetApp Solidfire
NetApp Steelstore Cloud Integrated Storage
NetApp Bootstrap Os
NetApp Hci Compute Node
NetApp A700s Firmware
NetApp A700s
NetApp H300s Firmware
NetApp H300s
NetApp H500s Firmware
NetApp H500s
NetApp H700s Firmware
NetApp H700s
NetApp H300e Firmware
NetApp H300e
NetApp H500e Firmware
NetApp H500e
NetApp H700e Firmware
NetApp H700e
NetApp H410s Firmware
NetApp H410s
NetApp H410c Firmware
NetApp H410c
NetApp H610c Firmware
NetApp H610c
NetApp H610s Firmware
NetApp H610s
NetApp H615c Firmware
NetApp H615c
All of the following
NetApp Bootstrap Os
NetApp Hci Compute Node
All of the following
NetApp A700s Firmware
NetApp A700s
All of the following
NetApp H300s Firmware
NetApp H300s
All of the following
NetApp H500s Firmware
NetApp H500s
All of the following
NetApp H700s Firmware
NetApp H700s
All of the following
NetApp H300e Firmware
NetApp H300e
All of the following
NetApp H500e Firmware
NetApp H500e
All of the following
NetApp H700e Firmware
NetApp H700e
All of the following
NetApp H410s Firmware
NetApp H410s
All of the following
NetApp H410c Firmware
NetApp H410c
All of the following
NetApp H610c Firmware
NetApp H610c
All of the following
NetApp H610s Firmware
NetApp H610s
All of the following
NetApp H615c Firmware
NetApp H615c
ubuntu/linux-aws<4.4.0-1074.78
4.4.0-1074.78
ubuntu/linux-azure<4.15.0-1091.101~14.04.1
4.15.0-1091.101~14.04.1
ubuntu/linux-lts-xenial<4.4.0-185.215~14.04.1
4.4.0-185.215~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-185.215
4.4.0-185.215
ubuntu/linux-aws<4.4.0-1110.121
4.4.0-1110.121
ubuntu/linux-aws-hwe<4.15.0-1074.78~16.04.1
4.15.0-1074.78~16.04.1
ubuntu/linux-azure<4.15.0-1091.101~16.04.1
4.15.0-1091.101~16.04.1
ubuntu/linux-gcp<4.15.0-1078.88~16.04.1
4.15.0-1078.88~16.04.1
ubuntu/linux-hwe<4.15.0-107.108~16.04.1
4.15.0-107.108~16.04.1
ubuntu/linux-kvm<4.4.0-1076.83
4.4.0-1076.83
ubuntu/linux-oracle<4.15.0-1046.50~16.04.1
4.15.0-1046.50~16.04.1
ubuntu/linux-raspi2<4.4.0-1135.144
4.4.0-1135.144
ubuntu/linux-snapdragon<4.4.0-1139.147
4.4.0-1139.147
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1042.47
4.4.0-1042.47
ubuntu/linux-fips*
ubuntu/linux<4.15.0-109.110
4.15.0-109.110
ubuntu/linux-aws<4.15.0-1077.81
4.15.0-1077.81
ubuntu/linux-aws-5.3<5.3.0-1030.32~18.04.1
5.3.0-1030.32~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1091.101
4.15.0-1091.101
ubuntu/linux-azure-5.3<5.3.0-1032.33~18.04.1
5.3.0-1032.33~18.04.1
ubuntu/linux-gcp-4.15<4.15.0-1078.88
4.15.0-1078.88
ubuntu/linux-gcp-5.3<5.3.0-1030.32~18.04.1
5.3.0-1030.32~18.04.1
ubuntu/linux-gke-4.15<4.15.0-1064.67
4.15.0-1064.67
ubuntu/linux-gke-5.0<5.0.0-1043.44
5.0.0-1043.44
ubuntu/linux-gke-5.3<5.3.0-1030.32~18.04.1
5.3.0-1030.32~18.04.1
ubuntu/linux-hwe<5.3.0-62.56~18.04.1
5.3.0-62.56~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-40.44~18.04.1
5.4.0-40.44~18.04.1
ubuntu/linux-kvm<4.15.0-1069.70
4.15.0-1069.70
ubuntu/linux-oem<4.15.0-1091.101
4.15.0-1091.101
ubuntu/linux-oem-osp1<5.0.0-1063.68
5.0.0-1063.68
ubuntu/linux-oracle<4.15.0-1048.52
4.15.0-1048.52
ubuntu/linux-oracle-5.3<5.3.0-1028.30~18.04.1
5.3.0-1028.30~18.04.1
ubuntu/linux-raspi2<4.15.0-1065.69
4.15.0-1065.69
ubuntu/linux-raspi2-5.3<5.3.0-1028.30~18.04.2
5.3.0-1028.30~18.04.2
ubuntu/linux-snapdragon<4.15.0-1081.88
4.15.0-1081.88
ubuntu/linux-aws-5.0*
ubuntu/linux-azure*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-edge*
ubuntu/linux-hwe-edge*
ubuntu/linux-oracle-5.0*
ubuntu/linux-aws-fips<4.15.0-2022.22
4.15.0-2022.22
ubuntu/linux-azure-fips<4.15.0-2006.7
4.15.0-2006.7
ubuntu/linux-fips<4.15.0-1035.40
4.15.0-1035.40
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-40.44
5.4.0-40.44
ubuntu/linux-aws<5.4.0-1018.18
5.4.0-1018.18
ubuntu/linux-azure<5.4.0-1020.20
5.4.0-1020.20
ubuntu/linux-gcp<5.4.0-1019.19
5.4.0-1019.19
ubuntu/linux-kvm<5.4.0-1018.18
5.4.0-1018.18
ubuntu/linux-oem-5.6<5.6.0-1011.11
5.6.0-1011.11
ubuntu/linux-oracle<5.4.0-1019.19
5.4.0-1019.19
ubuntu/linux-raspi<5.4.0-1013.13
5.4.0-1013.13
ubuntu/linux-riscv<5.4.0-28.32
5.4.0-28.32
ubuntu/linux-azure-fde*
ubuntu/linux-gke*
ubuntu/linux-raspi2*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-raspi-realtime*
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.3-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.rt56.1131.el7
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.el7
  3. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-693.81.1.el7
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.65.1.el7
  5. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1062.40.1.el7
  6. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-240.rt7.54.el8
  7. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-240.el8
  8. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1074.78
  9. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1091.101~14.04.1
  10. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-185.215~14.04.1
  11. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-185.215
  12. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1110.121
  13. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1074.78~16.04.1
  14. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1091.101~16.04.1
  15. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1078.88~16.04.1
  16. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-107.108~16.04.1
  17. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1076.83
  18. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1046.50~16.04.1
  19. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1135.144
  20. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1139.147
  21. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1042.47
  22. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-109.110
  23. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1077.81
  24. Upgrade

    Upgrade ubuntu/linux-aws-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1030.32~18.04.1
  25. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1091.101
  26. Upgrade

    Upgrade ubuntu/linux-azure-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1032.33~18.04.1
  27. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1078.88
  28. Upgrade

    Upgrade ubuntu/linux-gcp-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1030.32~18.04.1
  29. Upgrade

    Upgrade ubuntu/linux-gke-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1064.67
  30. Upgrade

    Upgrade ubuntu/linux-gke-5.0 to a version that resolves this vulnerability.

    Fixed in 5.0.0-1043.44
  31. Upgrade

    Upgrade ubuntu/linux-gke-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1030.32~18.04.1
  32. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 5.3.0-62.56~18.04.1
  33. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-40.44~18.04.1
  34. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1069.70
  35. Upgrade

    Upgrade ubuntu/linux-oem to a version that resolves this vulnerability.

    Fixed in 4.15.0-1091.101
  36. Upgrade

    Upgrade ubuntu/linux-oem-osp1 to a version that resolves this vulnerability.

    Fixed in 5.0.0-1063.68
  37. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1048.52
  38. Upgrade

    Upgrade ubuntu/linux-oracle-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1028.30~18.04.1
  39. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1065.69
  40. Upgrade

    Upgrade ubuntu/linux-raspi2-5.3 to a version that resolves this vulnerability.

    Fixed in 5.3.0-1028.30~18.04.2
  41. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1081.88
  42. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2022.22
  43. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2006.7
  44. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1035.40
  45. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-40.44
  46. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1018.18
  47. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1020.20
  48. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1019.19
  49. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1018.18
  50. Upgrade

    Upgrade ubuntu/linux-oem-5.6 to a version that resolves this vulnerability.

    Fixed in 5.6.0-1011.11
  51. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1019.19
  52. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1013.13
  53. Upgrade

    Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.

    Fixed in 5.4.0-28.32
  54. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.3-1
  55. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch CID-83c6f2390040

Event History

Apr 14, 2020
CVE Published
12:00 AM
May 9, 2020
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·08:16 PM
Data Sourced
via MITRE·08:16 PM
Description
Data Sourced
via OSV·09:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·09:15 PM
RemedyDescriptionSeverityAffected Software
May 12, 2020
Data Sourced
via Red Hat·02:15 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2020-12770?

CVE-2020-12770 has a severity rating that may lead to Denial of Service (DoS) under specific conditions.

2

How do I fix CVE-2020-12770?

To fix CVE-2020-12770, upgrade to the recommended kernel versions from the vendors as specified in the security advisories.

3

What systems are affected by CVE-2020-12770?

CVE-2020-12770 affects multiple versions of the Linux kernel and specific Linux distributions including Red Hat, Fedora, and Debian.

4

Can CVE-2020-12770 be exploited remotely?

CVE-2020-12770 requires local access and special user privileges to be exploited, making it less likely to be exploited remotely.

5

What is the potential impact of CVE-2020-12770?

The impact of CVE-2020-12770 includes potential Denial of Service (DoS), affecting system availability.

Company

Resources

Contact

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