CVE-2021-47276 (GCVE-0-2021-47276)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:20 – Updated: 2026-05-11 13:51
VLAI
Title
ftrace: Do not blindly read the ip address in ftrace_bug()
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-23 21:21 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 0bc62e398bbd9e600959e610def5109957437b28 (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 4aedc2bc2b32c93555f47c95610efb89cc1ec09b (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < acf671ba79c1feccc3ec7cfdcffead4efcec49e7 (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 862dcc14f2803c556bdd73b43c27b023fafce2fb (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 7e4e824b109f1d41ccf223fbb0565d877d6223a2 (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 97524384762c1fb9b3ded931498dd2047bd0de81 (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 3e4ddeb68751fb4fb657199aed9cfd5d02796875 (git)
Affected: 05736a427f7e16be948ccbf39782bd3a6ae16b14 , < 6c14133d2d3f768e0a35128faac8aa6ed4815051 (git)
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Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 4.4.273 , ≤ 4.4.* (semver)
Unaffected: 4.9.273 , ≤ 4.9.* (semver)
Unaffected: 4.14.237 , ≤ 4.14.* (semver)
Unaffected: 4.19.195 , ≤ 4.19.* (semver)
Unaffected: 5.4.126 , ≤ 5.4.* (semver)
Unaffected: 5.10.44 , ≤ 5.10.* (semver)
Unaffected: 5.12.11 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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}



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