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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47276ftrace: Do not blindly read the ip address in ftrace_bug()

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 85.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.10.46-1DEBIAN-CVE-2021-47276
Debian:13linux5.10.46-1DEBIAN-CVE-2021-47276
Debian:14linux5.10.46-1DEBIAN-CVE-2021-47276
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47276
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47276
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47276

Affected products (as reported)

VendorProductVersions
Linux Linux 05736a427f7e16be948ccbf39782bd3a6ae16b14 – before 0bc62e398bbd9e600959e610def5109957437b2805736a427f7e16be948ccbf39782bd3a6ae16b14 – before 4aedc2bc2b32c93555f47c95610efb89cc1ec09b05736a427f7e16be948ccbf39782bd3a6ae16b14 – before acf671ba79c1feccc3ec7cfdcffead4efcec49e705736a427f7e16be948ccbf39782bd3a6ae16b14 – before 862dcc14f2803c556bdd73b43c27b023fafce2fb05736a427f7e16be948ccbf39782bd3a6ae16b14 – before 7e4e824b109f1d41ccf223fbb0565d877d6223a205736a427f7e16be948ccbf39782bd3a6ae16b14 – before 97524384762c1fb9b3ded931498dd2047bd0de8105736a427f7e16be948ccbf39782bd3a6ae16b14 – before 3e4ddeb68751fb4fb657199aed9cfd5d0279687505736a427f7e16be948ccbf39782bd3a6ae16b14 – before 6c14133d2d3f768e0a35128faac8aa6ed4815051
Linux Linux 2.6.28

References