CVE-2026-31397— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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，该漏洞源于对空folio使用folio_pfn，可能导致安装无效PMD或空指针取消引用。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | e3981db444a0a18d350d9f92e3f2e8d489b54211< f3caaee0f9e489fd2282d4ce45791dc8aed2da62 |
affected |
e3981db444a0a18d350d9f92e3f2e8d489b54211< e3133d0986dc5a231d5419167dbac65312b28b41 |
affected | ||
e3981db444a0a18d350d9f92e3f2e8d489b54211< fae654083bfa409bb2244f390232e2be47f05bfc |
affected | ||
6.16 |
affected | ||
< 6.16 |
unaffected | ||
6.18.20≤ 6.18.* |
unaffected | ||
6.19.10≤ 6.19.* |
unaffected | ||
7.0≤ * |
unaffected |
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一、 漏洞 CVE-2026-31397 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
mm/huge_memory: fix use of NULL folio in move_pages_huge_pmd()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/huge_memory: fix use of NULL folio in move_pages_huge_pmd()
move_pages_huge_pmd() handles UFFDIO_MOVE for both normal THPs and huge
zero pages. For the huge zero page path, src_folio is explicitly set to
NULL, and is used as a sentinel to skip folio operations like lock and
rmap.
In the huge zero page branch, src_folio is NULL, so folio_mk_pmd(NULL,
pgprot) passes NULL through folio_pfn() and page_to_pfn(). With
SPARSEMEM_VMEMMAP this silently produces a bogus PFN, installing a PMD
pointing to non-existent physical memory. On other memory models it is a
NULL dereference.
Use page_folio(src_page) to obtain the valid huge zero folio from the
page, which was obtained from pmd_page() and remains valid throughout.
After commit d82d09e48219 ("mm/huge_memory: mark PMD mappings of the huge
zero folio special"), moved huge zero PMDs must remain special so
vm_normal_page_pmd() continues to treat them as special mappings.
move_pages_huge_pmd() currently reconstructs the destination PMD in the
huge zero page branch, which drops PMD state such as pmd_special() on
architectures with CONFIG_ARCH_HAS_PTE_SPECIAL. As a result,
vm_normal_page_pmd() can treat the moved huge zero PMD as a normal page
and corrupt its refcount.
Instead of reconstructing the PMD from the folio, derive the destination
entry from src_pmdval after pmdp_huge_clear_flush(), then handle the PMD
metadata the same way move_huge_pmd() does for moved entries by marking it
soft-dirty and clearing uffd-wp.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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，该漏洞源于对空folio使用folio_pfn，可能导致安装无效PMD或空指针取消引用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-31397 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-04-03 · 共 71 条
| CVE-2026-31402 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-23450 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-23427 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-23428 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-23455 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-23425 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23461 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23462 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23457 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23459 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23456 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31393 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31392 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23458 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23432 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-31398 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23437 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23444 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23449 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23445 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 71 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-31397
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