CVE-2024-57883

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The check is incorrect if\nthe refcount is increased by the above caller, and this can cause the page\ntable leaked:\n\n BUG: Bad page state in process sh pfn:109324\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x66 pfn:0x109324\n flags: 0x17ffff800000000(node=0|zone=2|lastcpupid=0xfffff)\n page_type: f2(table)\n raw: 017ffff800000000 0000000000000000 0000000000000000 0000000000000000\n raw: 0000000000000066 0000000000000000 00000000f2000000 0000000000000000\n page dumped because: nonzero mapcount\n ...\n CPU: 31 UID: 0 PID: 7515 Comm: sh Kdump: loaded Tainted: G B 6.13.0-rc2master+ #7\n Tainted: [B]=BAD_PAGE\n Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n Call trace:\n show_stack+0x20/0x38 (C)\n dump_stack_lvl+0x80/0xf8\n dump_stack+0x18/0x28\n bad_page+0x8c/0x130\n free_page_is_bad_report+0xa4/0xb0\n free_unref_page+0x3cc/0x620\n __folio_put+0xf4/0x158\n split_huge_pages_all+0x1e0/0x3e8\n split_huge_pages_write+0x25c/0x2d8\n full_proxy_write+0x64/0xd8\n vfs_write+0xcc/0x280\n ksys_write+0x70/0x110\n __arm64_sys_write+0x24/0x38\n invoke_syscall+0x50/0x120\n el0_svc_common.constprop.0+0xc8/0xf0\n do_el0_svc+0x24/0x38\n el0_svc+0x34/0x128\n el0t_64_sync_handler+0xc8/0xd0\n el0t_64_sync+0x190/0x198\n\nThe issue may be triggered by damon, offline_page, page_idle, etc, which\nwill increase the refcount of page table.\n\n1. The page table itself will be discarded after reporting the\n \"nonzero mapcount\".\n\n2. The HugeTLB page mapped by the page table miss freeing since we\n treat the page table as shared and a shared page table will not be\n unmapped.\n\nFix it by introducing independent PMD page table shared count. As\ndescribed by comment, pt_index/pt_mm/pt_frag_refcount are used for s390\ngmap, x86 pgds and powerpc, pt_share_count is used for x86/arm64/riscv\npmds, so we can reuse the field as pt_share_count."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached through local memory-management syscalls (mmap/munmap/mremap/mprotect on hugetlbfs or MAP_HUGETLB) that drive huge_pmd_unshare() from __unmap_hugepage_range(), move_hugetlb_page_tables() and hugetlb_change_protection(). No network or remote-peer data reaches this code.\nAC:L - The attacker drives both sides of the window: they repeatedly set up and tear down hugetlb mappings while concurrently issuing GUP-fast operations (O_DIRECT, io_uring, vmsplice) whose try_get_folio() speculative pin is exactly the refcount inflation the commit names, and the attempt can be retried without bound until it lands. On the very common cloud-guest configuration, virtio-mem/balloon hot-unplug runs do_migrate_range(), which folio_try_get()s every PFN with no LRU pre-check, widening the window enormously.\nPR:L - Every operation the attacker performs \u2014 creating a PUD-aligned MAP_SHARED hugetlbfs mapping and then unmapping, remapping or mprotecting it \u2014 is available to any unprivileged local user on hosts where hugepages are provisioned (databases, KVM hosts, HPC and container nodes routinely make /dev/hugepages group-accessible), and huge_pmd_unshare() performs no capability check.\nUI:N - The attacker issues the syscalls itself in a loop; no action by any other user or administrator is needed to complete the attack.\nS:U - The corrupted page tables and leaked hugetlb folios belong to the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed even though the outcome is full kernel compromise.\nC:H - For PUD_SIZE hugetlb the refcount wrongly dropped belongs to the still-installed PUD page table page, and because free_pages_prepare() only runs the bad-page check under is_check_pages_enabled() (off on production kernels), that live page table is handed back to the buddy allocator and reallocated to attacker-controlled data, giving forged PUD entries and arbitrary physical memory read.\nI:H - The same freed-but-live page table gives the attacker write control over PUD entries, mapping arbitrary physical memory writable into their address space \u2014 an arbitrary kernel write and control-flow-hijack primitive; even short of that, mm_dec_nr_pmds() underflow and skipped unmapping corrupt kernel page-table accounting and mapcount state.\nA:H - Every triggering instance permanently leaks the PMD/PUD page table plus all hugetlb folios it mapped (they are never unmapped, so their mapcount and refcount stay pinned until reboot), repeatably exhausting the scarce pre-reserved hugetlb pool; on debug or panic_on_taint kernels it also produces the reported \"BUG: Bad page state\" with kernel taint, and freeing a live page table into the allocator crashes the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/mm.h", "include/linux/mm_types.h", "mm/hugetlb.c"], "versions": [{"version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133", "status": "affected", "versionType": "git"}, {"version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "8410996eb6fea116fe1483ed977aacf580eee7b4", "status": "affected", "versionType": "git"}, {"version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "02333ac1c35370517a19a4a131332a9690c6a5c7", "status": "affected", "versionType": "git"}, {"version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "56b274473d6e7e7375f2d0a2b4aca11d67c6b52f", "status": "affected", "versionType": "git"}, {"version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "2e31443a0d18ae43b9d29e02bf0563f07772193d", "status": "affected", "versionType": "git"}, {"version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "59d9094df3d79443937add8700b2ef1a866b1081", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/mm.h", "include/linux/mm_types.h", "mm/hugetlb.c"], "versions": [{"version": "2.6.20", "status": "affected"}, {"version": "0", "lessThan": "2.6.20", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.239", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.186", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.72", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.9", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "5.10.239"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "5.15.186"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.1.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.6.72"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.12.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.20", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133"}, {"url": "https://git.kernel.org/stable/c/8410996eb6fea116fe1483ed977aacf580eee7b4"}, {"url": "https://git.kernel.org/stable/c/02333ac1c35370517a19a4a131332a9690c6a5c7"}, {"url": "https://git.kernel.org/stable/c/56b274473d6e7e7375f2d0a2b4aca11d67c6b52f"}, {"url": "https://git.kernel.org/stable/c/2e31443a0d18ae43b9d29e02bf0563f07772193d"}, {"url": "https://git.kernel.org/stable/c/59d9094df3d79443937add8700b2ef1a866b1081"}], "title": "mm: hugetlb: independent PMD page table shared count", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:31:29.588Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-57883", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:41:40.510365Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:51:49.573Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:31:29.588Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-57883", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:41:40.510365Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:41.355Z"}}], "cna": {"title": "mm: hugetlb: independent PMD page table shared count", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached through local memory-management syscalls (mmap/munmap/mremap/mprotect on hugetlbfs or MAP_HUGETLB) that drive huge_pmd_unshare() from __unmap_hugepage_range(), move_hugetlb_page_tables() and hugetlb_change_protection(). No network or remote-peer data reaches this code.\nAC:L - The attacker drives both sides of the window: they repeatedly set up and tear down hugetlb mappings while concurrently issuing GUP-fast operations (O_DIRECT, io_uring, vmsplice) whose try_get_folio() speculative pin is exactly the refcount inflation the commit names, and the attempt can be retried without bound until it lands. On the very common cloud-guest configuration, virtio-mem/balloon hot-unplug runs do_migrate_range(), which folio_try_get()s every PFN with no LRU pre-check, widening the window enormously.\nPR:L - Every operation the attacker performs \u2014 creating a PUD-aligned MAP_SHARED hugetlbfs mapping and then unmapping, remapping or mprotecting it \u2014 is available to any unprivileged local user on hosts where hugepages are provisioned (databases, KVM hosts, HPC and container nodes routinely make /dev/hugepages group-accessible), and huge_pmd_unshare() performs no capability check.\nUI:N - The attacker issues the syscalls itself in a loop; no action by any other user or administrator is needed to complete the attack.\nS:U - The corrupted page tables and leaked hugetlb folios belong to the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed even though the outcome is full kernel compromise.\nC:H - For PUD_SIZE hugetlb the refcount wrongly dropped belongs to the still-installed PUD page table page, and because free_pages_prepare() only runs the bad-page check under is_check_pages_enabled() (off on production kernels), that live page table is handed back to the buddy allocator and reallocated to attacker-controlled data, giving forged PUD entries and arbitrary physical memory read.\nI:H - The same freed-but-live page table gives the attacker write control over PUD entries, mapping arbitrary physical memory writable into their address space \u2014 an arbitrary kernel write and control-flow-hijack primitive; even short of that, mm_dec_nr_pmds() underflow and skipped unmapping corrupt kernel page-table accounting and mapcount state.\nA:H - Every triggering instance permanently leaks the PMD/PUD page table plus all hugetlb folios it mapped (they are never unmapped, so their mapcount and refcount stay pinned until reboot), repeatably exhausting the scarce pre-reserved hugetlb pool; on debug or panic_on_taint kernels it also produces the reported \"BUG: Bad page state\" with kernel taint, and freeing a live page table into the allocator crashes the system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133", "versionType": "git"}, {"status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "8410996eb6fea116fe1483ed977aacf580eee7b4", "versionType": "git"}, {"status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "02333ac1c35370517a19a4a131332a9690c6a5c7", "versionType": "git"}, {"status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "56b274473d6e7e7375f2d0a2b4aca11d67c6b52f", "versionType": "git"}, {"status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "2e31443a0d18ae43b9d29e02bf0563f07772193d", "versionType": "git"}, {"status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "lessThan": "59d9094df3d79443937add8700b2ef1a866b1081", "versionType": "git"}], "programFiles": ["include/linux/mm.h", "include/linux/mm_types.h", "mm/hugetlb.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.20"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.20", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.239", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.186", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.142", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.72", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.9", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/linux/mm.h", "include/linux/mm_types.h", "mm/hugetlb.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133"}, {"url": "https://git.kernel.org/stable/c/8410996eb6fea116fe1483ed977aacf580eee7b4"}, {"url": "https://git.kernel.org/stable/c/02333ac1c35370517a19a4a131332a9690c6a5c7"}, {"url": "https://git.kernel.org/stable/c/56b274473d6e7e7375f2d0a2b4aca11d67c6b52f"}, {"url": "https://git.kernel.org/stable/c/2e31443a0d18ae43b9d29e02bf0563f07772193d"}, {"url": "https://git.kernel.org/stable/c/59d9094df3d79443937add8700b2ef1a866b1081"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: hugetlb: independent PMD page table shared count\n\nThe folio refcount may be increased unexpectly through try_get_folio() by\ncaller such as split_huge_pages. In huge_pmd_unshare(), we use refcount\nto check whether a pmd page table is shared. The check is incorrect if\nthe refcount is increased by the above caller, and this can cause the page\ntable leaked:\n\n BUG: Bad page state in process sh pfn:109324\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x66 pfn:0x109324\n flags: 0x17ffff800000000(node=0|zone=2|lastcpupid=0xfffff)\n page_type: f2(table)\n raw: 017ffff800000000 0000000000000000 0000000000000000 0000000000000000\n raw: 0000000000000066 0000000000000000 00000000f2000000 0000000000000000\n page dumped because: nonzero mapcount\n ...\n CPU: 31 UID: 0 PID: 7515 Comm: sh Kdump: loaded Tainted: G B 6.13.0-rc2master+ #7\n Tainted: [B]=BAD_PAGE\n Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n Call trace:\n show_stack+0x20/0x38 (C)\n dump_stack_lvl+0x80/0xf8\n dump_stack+0x18/0x28\n bad_page+0x8c/0x130\n free_page_is_bad_report+0xa4/0xb0\n free_unref_page+0x3cc/0x620\n __folio_put+0xf4/0x158\n split_huge_pages_all+0x1e0/0x3e8\n split_huge_pages_write+0x25c/0x2d8\n full_proxy_write+0x64/0xd8\n vfs_write+0xcc/0x280\n ksys_write+0x70/0x110\n __arm64_sys_write+0x24/0x38\n invoke_syscall+0x50/0x120\n el0_svc_common.constprop.0+0xc8/0xf0\n do_el0_svc+0x24/0x38\n el0_svc+0x34/0x128\n el0t_64_sync_handler+0xc8/0xd0\n el0t_64_sync+0x190/0x198\n\nThe issue may be triggered by damon, offline_page, page_idle, etc, which\nwill increase the refcount of page table.\n\n1. The page table itself will be discarded after reporting the\n \"nonzero mapcount\".\n\n2. The HugeTLB page mapped by the page table miss freeing since we\n treat the page table as shared and a shared page table will not be\n unmapped.\n\nFix it by introducing independent PMD page table shared count. As\ndescribed by comment, pt_index/pt_mm/pt_frag_refcount are used for s390\ngmap, x86 pgds and powerpc, pt_share_count is used for x86/arm64/riscv\npmds, so we can reuse the field as pt_share_count."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.239", "versionStartIncluding": "2.6.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.186", "versionStartIncluding": "2.6.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.142", "versionStartIncluding": "2.6.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.72", "versionStartIncluding": "2.6.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.9", "versionStartIncluding": "2.6.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "2.6.20"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:46:45.519Z"}}}, "cveMetadata": {"cveId": "CVE-2024-57883", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:51:49.573Z", "dateReserved": "2025-01-11T14:45:42.024Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-01-15T13:05:36.352Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/mm.h", "include/linux/mm_types.h", "mm/hugetlb.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133", "status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "versionType": "git"}, {"lessThan": "8410996eb6fea116fe1483ed977aacf580eee7b4", "status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "versionType": "git"}, {"lessThan": "02333ac1c35370517a19a4a131332a9690c6a5c7", "status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "versionType": "git"}, {"lessThan": "56b274473d6e7e7375f2d0a2b4aca11d67c6b52f", "status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "versionType": "git"}, {"lessThan": "2e31443a0d18ae43b9d29e02bf0563f07772193d", "status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "versionType": "git"}, {"lessThan": "59d9094df3d79443937add8700b2ef1a866b1081", "status": "affected", "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/mm.h", "include/linux/mm_types.h", "mm/hugetlb.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.20"}, {"lessThan": "2.6.20", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.239", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.186", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.142", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.72", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1EE21F6F-2600-42F4-93A9-ACB07AC4B055", "versionEndExcluding": "5.10.239", "versionStartIncluding": "2.6.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D96F2C0D-0D4A-4658-AD34-D8A626EA422D", "versionEndExcluding": "5.15.186", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "459B4E94-FE0E-434D-B782-95E3A5FFC6B1", "versionEndExcluding": "6.1.142", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "33E12097-C88A-45B4-9677-2A961A08DD3E", "versionEndExcluding": "6.6.72", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1D13AF97-FFED-4B68-906D-CFE38D0B88DD", "versionEndExcluding": "6.12.9", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*", "matchCriteriaId": "93C0660D-7FB8-4FBA-892A-B064BA71E49E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*", "matchCriteriaId": "034C36A6-C481-41F3-AE9A-D116E5BE6895", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: hugetlb: independent PMD page table shared count\n\nThe folio refcount may be increased unexpectly through try_get_folio() by\ncaller such as split_huge_pages. In huge_pmd_unshare(), we use refcount\nto check whether a pmd page table is shared. The check is incorrect if\nthe refcount is increased by the above caller, and this can cause the page\ntable leaked:\n\n BUG: Bad page state in process sh pfn:109324\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x66 pfn:0x109324\n flags: 0x17ffff800000000(node=0|zone=2|lastcpupid=0xfffff)\n page_type: f2(table)\n raw: 017ffff800000000 0000000000000000 0000000000000000 0000000000000000\n raw: 0000000000000066 0000000000000000 00000000f2000000 0000000000000000\n page dumped because: nonzero mapcount\n ...\n CPU: 31 UID: 0 PID: 7515 Comm: sh Kdump: loaded Tainted: G B 6.13.0-rc2master+ #7\n Tainted: [B]=BAD_PAGE\n Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n Call trace:\n show_stack+0x20/0x38 (C)\n dump_stack_lvl+0x80/0xf8\n dump_stack+0x18/0x28\n bad_page+0x8c/0x130\n free_page_is_bad_report+0xa4/0xb0\n free_unref_page+0x3cc/0x620\n __folio_put+0xf4/0x158\n split_huge_pages_all+0x1e0/0x3e8\n split_huge_pages_write+0x25c/0x2d8\n full_proxy_write+0x64/0xd8\n vfs_write+0xcc/0x280\n ksys_write+0x70/0x110\n __arm64_sys_write+0x24/0x38\n invoke_syscall+0x50/0x120\n el0_svc_common.constprop.0+0xc8/0xf0\n do_el0_svc+0x24/0x38\n el0_svc+0x34/0x128\n el0t_64_sync_handler+0xc8/0xd0\n el0t_64_sync+0x190/0x198\n\nThe issue may be triggered by damon, offline_page, page_idle, etc, which\nwill increase the refcount of page table.\n\n1. The page table itself will be discarded after reporting the\n \"nonzero mapcount\".\n\n2. The HugeTLB page mapped by the page table miss freeing since we\n treat the page table as shared and a shared page table will not be\n unmapped.\n\nFix it by introducing independent PMD page table shared count. As\ndescribed by comment, pt_index/pt_mm/pt_frag_refcount are used for s390\ngmap, x86 pgds and powerpc, pt_share_count is used for x86/arm64/riscv\npmds, so we can reuse the field as pt_share_count."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: hugetlb: recuento compartido de la tabla de p\u00e1ginas PMD independiente El recuento de referencias de folio puede aumentar inesperadamente a trav\u00e9s de try_get_folio() por un llamador como split_huge_pages. En huge_pmd_unshare(), usamos el recuento de referencias para verificar si una tabla de p\u00e1ginas pmd est\u00e1 compartida. La comprobaci\u00f3n es incorrecta si el llamador anterior aumenta el refcount, y esto puede provocar una fuga de la tabla de p\u00e1ginas: ERROR: Estado de p\u00e1gina incorrecto en proceso sh pfn:109324 p\u00e1gina: refcount:0 mapcount:0 mapping:0000000000000000 \u00edndice:0x66 pfn:0x109324 indicadores: 0x17ffff800000000(nodo=0|zona=2|lastcpupid=0xfffff) tipo_p\u00e1gina: f2(tabla) sin procesar: 017ffff800000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 sin procesar: 0000000000000066 0000000000000000 00000000f2000000 0000000000000000 p\u00e1gina volcada porque: mapcount distinto de cero ... CPU: 31 UID: 0 PID: 7515 Comm: sh Kdump: cargado Contaminado: GB 6.13.0-rc2master+ #7 Contaminado: [B]=BAD_PAGE Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 Call trace: show_stack+0x20/0x38 (C) dump_stack_lvl+0x80/0xf8 dump_stack+0x18/0x28 bad_page+0x8c/0x130 free_page_is_bad_report+0xa4/0xb0 free_unref_page+0x3cc/0x620 __folio_put+0xf4/0x158 split_huge_pages_all+0x1e0/0x3e8 split_huge_pages_write+0x25c/0x2d8 full_proxy_write+0x64/0xd8 vfs_write+0xcc/0x280 ksys_write+0x70/0x110 __arm64_sys_write+0x24/0x38 invoke_syscall+0x50/0x120 el0_svc_common.constprop.0+0xc8/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x34/0x128 el0t_64_sync_handler+0xc8/0xd0 el0t_64_sync+0x190/0x198 El problema puede ser provocado por damon, offline_page, page_idle, etc., que aumentar\u00e1n el recuento de referencias de la tabla de p\u00e1ginas. 1. La tabla de p\u00e1ginas en s\u00ed se descartar\u00e1 despu\u00e9s de informar el \"recuento de mapas distinto de cero\". 2. La p\u00e1gina HugeTLB mapeada por la tabla de p\u00e1ginas no se libera ya que tratamos la tabla de p\u00e1ginas como compartida y una tabla de p\u00e1ginas compartida no se desasignar\u00e1. Arr\u00e9glelo introduciendo un recuento de p\u00e1ginas compartidas de tabla de p\u00e1ginas PMD independiente. Como se describe en el comentario, pt_index/pt_mm/pt_frag_refcount se utilizan para s390 gmap, x86 pgds y powerpc, pt_share_count se utiliza para x86/arm64/riscv pmds, por lo que podemos reutilizar el campo como pt_share_count."}], "id": "CVE-2024-57883", "lastModified": "2026-10-15T22:18:03.883", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-57883", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:41:40.510365Z", "version": "2.0.3"}}]}, "published": "2025-01-15T13:15:12.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02333ac1c35370517a19a4a131332a9690c6a5c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e31443a0d18ae43b9d29e02bf0563f07772193d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56b274473d6e7e7375f2d0a2b4aca11d67c6b52f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/59d9094df3d79443937add8700b2ef1a866b1081"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8410996eb6fea116fe1483ed977aacf580eee7b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm: hugetlb: independent PMD page table shared count", "id": "2338206", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2338206"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-664", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: hugetlb: independent PMD page table shared count\nThe folio refcount may be increased unexpectly through try_get_folio() by\ncaller such as split_huge_pages. In huge_pmd_unshare(), we use refcount\nto check whether a pmd page table is shared. The check is incorrect if\nthe refcount is increased by the above caller, and this can cause the page\ntable leaked:\nBUG: Bad page state in process sh pfn:109324\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0x66 pfn:0x109324\nflags: 0x17ffff800000000(node=0|zone=2|lastcpupid=0xfffff)\npage_type: f2(table)\nraw: 017ffff800000000 0000000000000000 0000000000000000 0000000000000000\nraw: 0000000000000066 0000000000000000 00000000f2000000 0000000000000000\npage dumped because: nonzero mapcount\n...\nCPU: 31 UID: 0 PID: 7515 Comm: sh Kdump: loaded Tainted: G B 6.13.0-rc2master+ #7\nTainted: [B]=BAD_PAGE\nHardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\nCall trace:\nshow_stack+0x20/0x38 (C)\ndump_stack_lvl+0x80/0xf8\ndump_stack+0x18/0x28\nbad_page+0x8c/0x130\nfree_page_is_bad_report+0xa4/0xb0\nfree_unref_page+0x3cc/0x620\n__folio_put+0xf4/0x158\nsplit_huge_pages_all+0x1e0/0x3e8\nsplit_huge_pages_write+0x25c/0x2d8\nfull_proxy_write+0x64/0xd8\nvfs_write+0xcc/0x280\nksys_write+0x70/0x110\n__arm64_sys_write+0x24/0x38\ninvoke_syscall+0x50/0x120\nel0_svc_common.constprop.0+0xc8/0xf0\ndo_el0_svc+0x24/0x38\nel0_svc+0x34/0x128\nel0t_64_sync_handler+0xc8/0xd0\nel0t_64_sync+0x190/0x198\nThe issue may be triggered by damon, offline_page, page_idle, etc, which\nwill increase the refcount of page table.\n1. The page table itself will be discarded after reporting the\n\"nonzero mapcount\".\n2. The HugeTLB page mapped by the page table miss freeing since we\ntreat the page table as shared and a shared page table will not be\nunmapped.\nFix it by introducing independent PMD page table shared count. As\ndescribed by comment, pt_index/pt_mm/pt_frag_refcount are used for s390\ngmap, x86 pgds and powerpc, pt_share_count is used for x86/arm64/riscv\npmds, so we can reuse the field as pt_share_count."], "name": "CVE-2024-57883", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-57883\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-57883\nhttps://lore.kernel.org/linux-cve-announce/2025011510-CVE-2024-57883-b603@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-06T22:16:31.287139+00:00", "updated": "2025-07-06T22:16:31.287182+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}