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kernel: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race

🗓️ 02 Sep 2025 01:50:49Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 10 Views

Fix huge_pmd_unshare race with GUP-fast by broadcasting TLB removal to avoid process page tables.

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Refs
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IBM Security Bulletins		Security Bulletin: Vulnerabilities in kernel affects IBM Netezza Appliance
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Tenable Nessus		Amazon Linux 2023 : bpftool, kernel6.12, kernel6.12-modules-extra (ALAS2023-2025-1080)
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Tenable Nessus		Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2025-1111)
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Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2025-098 (ALASKERNEL-5.10-2025-098)
4 Aug 202500:00
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Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2025-082 (ALASKERNEL-5.15-2025-082)
10 Jul 202500:00
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Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2025:13589)
12 Aug 202500:00
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Tenable Nessus		AlmaLinux 8 : kernel-rt (ALSA-2025:13590)
12 Aug 202500:00
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Tenable Nessus		AlmaLinux 9 : kernel (ALSA-2025:13962)
22 Aug 202500:00
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Tenable Nessus		Azure Linux 3.0 Security Update: kernel (CVE-2025-38085)
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.8ppc64lebpftool4.18.0-477.108.1.el8_8bpftool-4.18.0-477.108.1.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64bpftool4.18.0-477.108.1.el8_8bpftool-4.18.0-477.108.1.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lebpftool-debuginfo4.18.0-477.108.1.el8_8bpftool-debuginfo-4.18.0-477.108.1.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64bpftool-debuginfo4.18.0-477.108.1.el8_8bpftool-debuginfo-4.18.0-477.108.1.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lekernel4.18.0-477.108.1.el8_8kernel-4.18.0-477.108.1.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kernel4.18.0-477.108.1.el8_8kernel-4.18.0-477.108.1.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8noarchkernel-abi-stablelists4.18.0-477.108.1.el8_8kernel-abi-stablelists-4.18.0-477.108.1.el8_8.noarch.rpm
Red Hat Enterprise Linux8.8ppc64lekernel-core4.18.0-477.108.1.el8_8kernel-core-4.18.0-477.108.1.el8_8.ppc64le.rpm
Red Hat Enterprise Linux8.8x86_64kernel-core4.18.0-477.108.1.el8_8kernel-core-4.18.0-477.108.1.el8_8.x86_64.rpm
Red Hat Enterprise Linux8.8ppc64lekernel-debug4.18.0-477.108.1.el8_8kernel-debug-4.18.0-477.108.1.el8_8.ppc64le.rpm
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30 Jun 2026 03:31Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.14.7
EPSS0.00114
SSVC
CWE-200
huge pmd unsharegup fast racetranslation lookaside bufferbroadcastkhugepagedpage tables
10