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CVE-2026-99017— riscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE

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: 勘误：为 THEAD GHOSTWRITE 漏洞选择 RISCV_ALTERNATIVE_EARLY errata_probe_ghostwrite() 函数仅在 RISCV_ALTERNATIVES_EARLY_BOOT 阶段被调用时，才会将 CPU 标记为存在漏洞；而 ghostwrite_enable_mitigation() 中的缓解措施仅在内核引导替代（boot alternatives）打补丁之前已记录漏洞状态时才生效。 早期引导阶段仅在启用

CVSS 7.0 · High EPSS 0.16% · P5

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 4bf97069239bcfca9840936313c7ac35a6e04488< fa465a7819ecbe5801b78c088d3cadaf2664b8ca affected
4bf97069239bcfca9840936313c7ac35a6e04488< 7fee577a2fa78b9a76da015beec1ccf978746ebb affected
4bf97069239bcfca9840936313c7ac35a6e04488< 298510bbc7c3017c0faf481c6ea66f1065b657b4 affected
6.14 affected
< 6.14 unaffected
6.18.57≤ 6.18.* unaffected
7.2.11≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-99017

Vulnerability Information
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Vulnerability Title
riscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: riscv: errata: select RISCV_ALTERNATIVE_EARLY for THEAD GHOSTWRITE errata_probe_ghostwrite() only marks the CPU as vulnerable when it is called at the RISCV_ALTERNATIVES_EARLY_BOOT stage, and the mitigation in ghostwrite_enable_mitigation() only takes effect if the vulnerable state was recorded before the boot alternatives are patched. The early boot stage is only executed when CONFIG_RISCV_ALTERNATIVE_EARLY is enabled, which currently is only selected by ERRATA_THEAD_MAE. In a kernel built with ERRATA_THEAD_GHOSTWRITE=y but ERRATA_THEAD_MAE=n, the early alternatives never run, so ghostwrite_state is never set to VULNERABLE: ghostwrite_enable_mitigation() returns false, xtheadvector remains enabled, and sysfs reports "Not affected" on a vulnerable T-Head C9xx CPU. Select RISCV_ALTERNATIVE_EARLY from ERRATA_THEAD_GHOSTWRITE so that the vulnerability is detected in the early boot stage and the default mitigation is applied.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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 4bf97069239bcfca9840936313c7ac35a6e04488 ~ fa465a7819ecbe5801b78c088d3cadaf2664b8ca -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-99017

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III. Intelligence Information for CVE-2026-99017

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Patches & Fixes for CVE-2026-99017 (3)

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-99016 7.8 HIGH riscv: futex: untag the user pointer before the atomic access
CVE-2026-99012 7.8 HIGH Bluetooth: ISO: Serialize concurrent connect calls
CVE-2026-99002 7.8 HIGH drm/vmwgfx: validate pitch coming from userspace
CVE-2026-98899 7.8 HIGH netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99006 7.8 HIGH drm/i915/gem: Prevent overstepping exec array boundary
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-99032 7.8 HIGH net/smc: protect clcsock lifetime in smc_getname

Showing top 20 of 217 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux