CVE-2024-38667 (GCVE-0-2024-38667)

Vulnerability from cvelistv5 – Published: 2024-06-24 13:52 – Updated: 2026-05-11 20:20
VLAI
Title
riscv: prevent pt_regs corruption for secondary idle threads
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: prevent pt_regs corruption for secondary idle threads Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted. Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2875fe0561569f82d0e63658ccf0d11ce7da8922 , < ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e (git)
Affected: 2875fe0561569f82d0e63658ccf0d11ce7da8922 , < 3090c06d50eaa91317f84bf3eac4c265e6cb8d44 (git)
Affected: 2875fe0561569f82d0e63658ccf0d11ce7da8922 , < 0c1f28c32a194303da630fca89481334b9547b80 (git)
Affected: 2875fe0561569f82d0e63658ccf0d11ce7da8922 , < a638b0461b58aa3205cd9d5f14d6f703d795b4af (git)
Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.1.93 , ≤ 6.1.* (semver)
Unaffected: 6.6.33 , ≤ 6.6.* (semver)
Unaffected: 6.9.4 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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