CVE-2021-47276

ftrace: Do not blindly read the ip address in ftrace_bug()

MEDIUM

5.5

CVSS Score

Published: May 21, 2024 at 02:20 PM UTC

Updated: June 17, 2026 at 04:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.28 ≤ v < 4.14.2372.6.28 ≤ v < 4.19.1952.6.28 ≤ v < 4.4.2732.6.28 ≤ v < 4.9.2732.6.28 ≤ v < 5.10.442.6.28 ≤ v < 5.12.112.6.28 ≤ v < 5.132.6.28 ≤ v < 5.4.1264.10 ≤ v < 4.14.2374.15 ≤ v < 4.19.1954.20 ≤ v < 5.4.1264.5 ≤ v < 4.9.2735.11 ≤ v < 5.12.115.5 ≤ v < 5.10.445.13 rc1 5.13 rc2 5.13 rc3 5.13 rc4 5.13 rc55736a427f7e16be948ccbf39782bd3a6ae16b14

Vendor states this is fixed in 0bc62e398bbd9e600959e610def5109957437b28 (fixed)

Vendor states this is fixed in 3e4ddeb68751fb4fb657199aed9cfd5d02796875 (fixed)

Vendor states this is fixed in 4aedc2bc2b32c93555f47c95610efb89cc1ec09b (fixed)

Vendor states this is fixed in 6c14133d2d3f768e0a35128faac8aa6ed4815051 (fixed)

Vendor states this is fixed in 7e4e824b109f1d41ccf223fbb0565d877d6223a2 (fixed)

Vendor states this is fixed in 862dcc14f2803c556bdd73b43c27b023fafce2fb (fixed)

Vendor states this is fixed in 97524384762c1fb9b3ded931498dd2047bd0de81 (fixed)

Vendor states this is fixed in acf671ba79c1feccc3ec7cfdcffead4efcec49e7 (fixed)

Vendor states this is fixed in 2.6.28 (unaffected)

Vendor states this is fixed in 4.14.237 (unaffected)

Vendor states this is fixed in 4.19.195 (unaffected)

Vendor states this is fixed in 4.4.273 (unaffected)