mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd() (Linux Linux)

CVE-2025-38681
MEDIUM 4.7

En bref

Source
NVD
EPSS
EPSS 0.13 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd() Memory hot remove unmaps and tears down various kernel page table regions as required. The ptdump code can race with concurrent modifications of the kernel page tables. When leaf entries are modified concurrently, the dump code may log stale or inconsistent information for a VA range, but this is otherwise not harmful. But when intermediate levels of kernel page table are freed, the dump code will continue to use memory that has been freed and potentially reallocated for another purpose. In such cases, the ptdump code may dereference bogus addresses, leading to a number of potential problems. To avoid the above mentioned race condition, platforms such as arm64, riscv and s390 take memory hotplug lock, while dumping kernel page table via the sysfs interface /sys/kernel/debug/kernel_page_tables. Similar race condition exists while checking for pages that might have been marked W+X via /sys/kernel/debug/kernel_page_tables/check_wx_pages which in turn calls ptdump_check_wx(). Instead of solving this race condition again, let's just move the memory hotplug lock inside generic ptdump_check_wx() which will benefit both the scenarios. Drop get_online_mems() and put_online_mems() combination from all existing platform ptdump code paths.

Faiblesses (CWE)

  • CWE-362 — Situation de compétition

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected bbd6ec605c0fc286c3f8ce60b4ed44635361d58b < 3ee9a8c27bfd72c3f465004fa8455785d61be5e8 ; affected bbd6ec605c0fc286c3f8ce60b4ed44635361d58b < 69bea84b06b5e779627e7afdbf4b60a7d231c76f ; affected bbd6ec605c0fc286c3f8ce60b4ed44635361d58b < ac25ec5fa2bf6e606dc7954488e4dded272fa9cd ; affected bbd6ec605c0fc286c3f8ce60b4ed44635361d58b < 1636b5e9c3543b87d673e32a47e7c18698882425 ; affected bbd6ec605c0fc286c3f8ce60b4ed44635361d58b < ff40839e018b82c4d756d035f34a63aa2d93be83 ; affected bbd6ec605c0fc286c3f8ce60b4ed44635361d58b < 67995d4244694928ce701928e530b5b4adeb17b4
Linux · Linuxaffected 5.7 ; unaffected 0 < 5.7 ; unaffected 5.10.241 ≤ 5.10.* ; unaffected 5.15.190 ≤ 5.15.* ; unaffected 6.1.149 ≤ 6.1.* ; unaffected 6.6.103 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD