UBUNTU-CVE-2021-47145: High severity ubuntu/linux-azure vulnerability

Q: What conditions are needed to trigger the failure?

The failure occurs during Btrfs log-tree recovery, with the shown call trace occurring while mounting a filesystem. The reported trigger was error-injection testing, and the affected path is link_to_fixup_dir during log replay.

Q: What is the practical impact?

The vulnerable code can hit a kernel BUG and panic, causing a denial of service. The provided vector indicates network attack complexity is low and no privileges are required, but user interaction is required.

Q: Which Ubuntu kernel packages are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

Published Mar 25, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUGON in linktofixupdir While doing error injection testing I got the following panic kernel BUG at fs/btrfs/tree-log.c:1862! invalid opcode: 0000 [#1] SMP NOPTI CPU: 1 PID: 7836 Comm: mount Not tainted 5.13.0-rc1+ #305 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014 RIP: 0010:linktofixupdir+0xd5/0xe0 RSP: 0018:ffffb5800180fa30 EFLAGS: 00010216 RAX: fffffffffffffffb RBX: 00000000fffffffb RCX: ffff8f595287faf0 RDX: ffffb5800180fa37 RSI: ffff8f5954978800 RDI: 0000000000000000 RBP: ffff8f5953af9450 R08: 0000000000000019 R09: 0000000000000001 R10: 000151f408682970 R11: 0000000120021001 R12: ffff8f5954978800 R13: ffff8f595287faf0 R14: ffff8f5953c77dd0 R15: 0000000000000065 FS: 00007fc5284c8c40(0000) GS:ffff8f59bbd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5287f47c0 CR3: 000000011275e002 CR4: 0000000000370ee0 Call Trace: replayonebuffer+0x409/0x470 ? btreereadextentbufferpages+0xd0/0x110 walkuplogtree+0x157/0x1e0 walklogtree+0xa6/0x1d0 btrfsrecoverlogtrees+0x1da/0x360 ? replayoneextent+0x7b0/0x7b0 openctree+0x1486/0x1720 btrfsmountroot.cold+0x12/0xea ? kmalloctrackcaller+0x12f/0x240 legacygettree+0x24/0x40 vfsgettree+0x22/0xb0 vfskernmount.part.0+0x71/0xb0 btrfsmount+0x10d/0x380 ? vfsparsefsstring+0x4d/0x90 legacygettree+0x24/0x40 vfsgettree+0x22/0xb0 pathmount+0x433/0xa10 x64sysmount+0xe3/0x120 dosyscall64+0x3d/0x80 entrySYSCALL64afterhwframe+0x44/0xae We can get -EIO or any number of legitimate errors from btrfssearchslot(), panicing here is not the appropriate response. The error path for this code handles errors properly, simply return the error.

Affected Software

118 affected componentsFixes available

ubuntu/linux-azure<4.15.0-1121.134~14.04.1

4.15.0-1121.134~14.04.1

ubuntu/linux*

ubuntu/linux-aws<4.4.0-1153.159

4.4.0-1153.159

ubuntu/linux-lts-xenial<4.4.0-279.313~14.04.1

4.4.0-279.313~14.04.1

ubuntu/linux<4.4.0-279.313

4.4.0-279.313

ubuntu/linux-aws<4.4.0-1191.206

4.4.0-1191.206

ubuntu/linux-aws-hwe<4.15.0-1109.116~16.04.1

4.15.0-1109.116~16.04.1

ubuntu/linux-azure<4.15.0-1121.134~16.04.1

4.15.0-1121.134~16.04.1

ubuntu/linux-gcp<4.15.0-1106.120~16.04.1

4.15.0-1106.120~16.04.1

ubuntu/linux-hwe<4.15.0-151.157~16.04.1

4.15.0-151.157~16.04.1

ubuntu/linux-kvm<4.4.0-1154.165

4.4.0-1154.165

ubuntu/linux-oracle<4.15.0-1078.86~16.04.1

4.15.0-1078.86~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1123.130

4.4.0-1123.130

ubuntu/linux-fips*

ubuntu/linux<4.15.0-151.157

4.15.0-151.157

ubuntu/linux-aws<4.15.0-1109.116

4.15.0-1109.116

ubuntu/linux-aws-5.4<5.4.0-1054.57~18.04.1

5.4.0-1054.57~18.04.1

ubuntu/linux-azure-4.15<4.15.0-1121.134

4.15.0-1121.134

ubuntu/linux-azure-5.4<5.4.0-1055.57~18.04.1

5.4.0-1055.57~18.04.1

ubuntu/linux-gcp-4.15<4.15.0-1106.120

4.15.0-1106.120

ubuntu/linux-gcp-5.4<5.4.0-1049.53~18.04.1

5.4.0-1049.53~18.04.1

ubuntu/linux-hwe-5.4<5.4.0-80.90~18.04.1

5.4.0-80.90~18.04.1

ubuntu/linux-kvm<4.15.0-1097.99

4.15.0-1097.99

ubuntu/linux-oracle<4.15.0-1078.86

4.15.0-1078.86

ubuntu/linux-oracle-5.4<5.4.0-1052.56~18.04.1

5.4.0-1052.56~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1041.45~18.04.1

5.4.0-1041.45~18.04.1

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-fips<4.15.0-2051.53

4.15.0-2051.53

ubuntu/linux-azure-fips<4.15.0-2033.37

4.15.0-2033.37

ubuntu/linux-fips<4.15.0-1066.75

4.15.0-1066.75

ubuntu/linux-gcp-fips<4.15.0-2016.18

4.15.0-2016.18

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-80.90

5.4.0-80.90

ubuntu/linux-aws<5.4.0-1054.57

5.4.0-1054.57

ubuntu/linux-azure<5.4.0-1055.57

5.4.0-1055.57

ubuntu/linux-bluefield<5.4.0-1016.19

5.4.0-1016.19

ubuntu/linux-gcp<5.4.0-1049.53

5.4.0-1049.53

ubuntu/linux-gkeop<5.4.0-1021.22

5.4.0-1021.22

ubuntu/linux-kvm<5.4.0-1044.46

5.4.0-1044.46

ubuntu/linux-oracle<5.4.0-1052.56

5.4.0-1052.56

ubuntu/linux-raspi<5.4.0-1041.45

5.4.0-1041.45

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux-aws-fips<5.4.0-1069.73+fips2

5.4.0-1069.73+fips2

ubuntu/linux-azure-fips<5.4.0-1073.76+fips1

5.4.0-1073.76+fips1

ubuntu/linux-fips<5.4.0-1031.36

5.4.0-1031.36

ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1

5.4.0-1067.71~20.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-nvidia-6.2*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-raspi-realtime*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1121.134~14.04.1
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1153.159
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-279.313~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-279.313
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1191.206
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1109.116~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1121.134~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1106.120~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-151.157~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1154.165
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1078.86~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1123.130
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-151.157
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1109.116
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1054.57~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1121.134
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.57~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1106.120
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1049.53~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-80.90~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1097.99
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1078.86
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1052.56~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1041.45~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2051.53
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2033.37
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1066.75
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2016.18
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-80.90
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1054.57
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1055.57
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1016.19
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1049.53
Upgrade
Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 5.4.0-1021.22
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1044.46
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1052.56
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1041.45
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1069.73+fips2
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1073.76+fips1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1031.36
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1067.71~20.04.1
Compensating control
In btrfs link_to_fixup_dir, replace the BUG_ON response for errors from btrfs_search_slot() with returning the error, such as -EIO or another legitimate error.

Event History

Mar 25, 2024

CVE Published

via OSV·09:15 AM

Data Sourced

via OSV·09:15 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

What conditions are needed to trigger the failure?

The failure occurs during Btrfs log-tree recovery, with the shown call trace occurring while mounting a filesystem. The reported trigger was error-injection testing, and the affected path is link_to_fixup_dir during log replay.

What is the practical impact?

The vulnerable code can hit a kernel BUG and panic, causing a denial of service. The provided vector indicates network attack complexity is low and no privileges are required, but user interaction is required.

Which Ubuntu kernel packages are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

UBUNTU-CVE-2021-47145: High severity ubuntu/linux-azure vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

What conditions are needed to trigger the failure?

What is the practical impact?

Which Ubuntu kernel packages are listed as affected?

Company

Resources

Contact

Frequently Asked Questions

What conditions are needed to trigger the failure?

What is the practical impact?

Which Ubuntu kernel packages are listed as affected?