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CVE-2026-98951— riscv: ptrace: Zero-initialize regset buffers before copyin

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.

在 Linux 内核中，以下漏洞已得到修复： riscv: ptrace：在执行 copyin 之前将 regset 缓冲区零初始化 user_regset_copyin() 函数仅复制 个字节，因此当 PTRACE_SETREGSET 请求中的 较短时，栈缓冲区的其余部分将保持未初始化状态。在 riscv_vr_set() 中，这些未初始化的垃圾数据会被验证并复制到目标进程的 vstate 中；而在 riscv_cfi_set() 中，它们可能被存储为目标进程的影子栈指针。应像读取路径（get path）那样，将

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 9300f00439743c4a34d735e1a27118eb68a1504e< 89fc70d73f4ac8781f9e15edd1dbc6b6088453b3 affected
9300f00439743c4a34d735e1a27118eb68a1504e< 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97 affected
f2a9cd050901c4734bc175294c3bd6a40a1a9e99 affected
6.5.3< 6.6 affected
6.6 affected
< 6.6 unaffected
7.2.11≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-98951

Vulnerability Information
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Vulnerability Title
riscv: ptrace: Zero-initialize regset buffers before copyin
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: riscv: ptrace: Zero-initialize regset buffers before copyin user_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET request with a short iov_len leaves the rest of the stack buffer uninitialized. In riscv_vr_set() that garbage is validated and copied into the target's vstate, and in riscv_cfi_set() it can be stored as the target's shadow stack pointer. Zero both buffers, as the get path already does.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9300f00439743c4a34d735e1a27118eb68a1504e ~ 89fc70d73f4ac8781f9e15edd1dbc6b6088453b3 -
Linux Linux 6.6 -

II. Public POCs for CVE-2026-98951

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III. Intelligence Information for CVE-2026-98951

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Patches & Fixes for CVE-2026-98951 (2)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98937 perf/core: Check kernel access when kernel callchains are requested
CVE-2026-98950 flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()
CVE-2026-98949 drm/imagination: Fix reference and vm_bo handling in remap()
CVE-2026-98948 mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
CVE-2026-98947 vsock: Fix memory leak in vmci_transport_recv_dgram_cb()
CVE-2026-98946 drm/vc4: Disable the V3D interrupt across runtime suspend
CVE-2026-98945 HID: steam: Rearrange teardown sequence
CVE-2026-98944 HID: steam: Refactor registration
CVE-2026-98943 HID: steam: Clean up locking
CVE-2026-98942 sched_ext: Build the cid tables privately and publish them with RCU
CVE-2026-98941 ext4: don't enable large folios on encrypted inodes
CVE-2026-98940 ASoC: qcom: lpass-cpu: use DAI table index for playback constraints
CVE-2026-98939 x86/mm: Drop unnecessary PMD page copy when freeing
CVE-2026-98938 rust: irq: pass RegistrationInner as cookie to request_irq
CVE-2026-98926 drm/amd/display: Remove sink usage from DPMS
CVE-2026-98929 macsec: initialize SecY before registering the netdevice
CVE-2026-98928 KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
CVE-2026-98927 KVM: arm64: nv: Fix life cycle of the nested_mmus array
CVE-2026-98930 KVM: s390: Fix IRQ injection with SIGP Stop and Store Status
CVE-2026-98925 bpf, sockmap: Fix self-redirect copied_seq double-counting

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98951

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