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CVE-2024-38667— riscv: prevent pt_regs corruption for secondary idle threads

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于次级启动 hart的空闲线程顶部未为 pt_regs保留空间，导致防止次级空闲线程的pt_regs损坏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 2875fe0561569f82d0e63658ccf0d11ce7da8922< ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e affected
2875fe0561569f82d0e63658ccf0d11ce7da8922< 3090c06d50eaa91317f84bf3eac4c265e6cb8d44 affected
2875fe0561569f82d0e63658ccf0d11ce7da8922< 0c1f28c32a194303da630fca89481334b9547b80 affected
2875fe0561569f82d0e63658ccf0d11ce7da8922< a638b0461b58aa3205cd9d5f14d6f703d795b4af affected
5.7 affected
< 5.7 unaffected
6.1.93≤ 6.1.* unaffected
6.6.33≤ 6.6.* unaffected
… +2 more rows
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I. Basic Information for CVE-2024-38667

Vulnerability Information
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Vulnerability Title
riscv: prevent pt_regs corruption for secondary idle threads
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于次级启动 hart的空闲线程顶部未为 pt_regs保留空间，导致防止次级空闲线程的pt_regs损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2875fe0561569f82d0e63658ccf0d11ce7da8922 ~ ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e -
Linux Linux 5.7 -

II. Public POCs for CVE-2024-38667

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III. Intelligence Information for CVE-2024-38667

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Other References for CVE-2024-38667 (2)

Same Patch Batch · Linux · 2024-06-24 · 14 CVEs total

CVE-2024-38384 7.8 HIGH blk-cgroup: fix list corruption from reorder of WRITE ->lqueued
CVE-2024-38663 7.8 HIGH blk-cgroup: fix list corruption from resetting io stat
CVE-2024-39292 7.8 HIGH um: Add winch to winch_handlers before registering winch IRQ
CVE-2024-32936 7.8 HIGH media: ti: j721e-csi2rx: Fix races while restarting DMA
CVE-2024-34027 7.8 HIGH f2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock
CVE-2024-33847 7.1 HIGH f2fs: compress: don't allow unaligned truncation on released compress inode
CVE-2024-38664 drm: zynqmp_dpsub: Always register bridge
CVE-2024-39291 drm/amdgpu: Fix buffer size in gfx_v9_4_3_init_ cp_compute_microcode() and rlc_microcode()
CVE-2024-34030 PCI: of_property: Return error for int_map allocation failure
CVE-2024-35247 fpga: region: add owner module and take its refcount
CVE-2024-36479 fpga: bridge: add owner module and take its refcount
CVE-2024-37021 fpga: manager: add owner module and take its refcount
CVE-2024-37026 drm/xe: Only use reserved BCS instances for usm migrate exec queue

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-38667

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