{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56673", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T15:00:39.845Z", "datePublished": "2024-12-27T15:06:34.280Z", "dateUpdated": "2026-05-11T20:57:02.938Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:57:02.938Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Do not call pmd dtor on vmemmap page table teardown\n\nThe vmemmap's, which is used for RV64 with SPARSEMEM_VMEMMAP, page\ntables are populated using pmd (page middle directory) hugetables.\nHowever, the pmd allocation is not using the generic mechanism used by\nthe VMA code (e.g. pmd_alloc()), or the RISC-V specific\ncreate_pgd_mapping()/alloc_pmd_late(). Instead, the vmemmap page table\ncode allocates a page, and calls vmemmap_set_pmd(). This results in\nthat the pmd ctor is *not* called, nor would it make sense to do so.\n\nNow, when tearing down a vmemmap page table pmd, the cleanup code\nwould unconditionally, and incorrectly call the pmd dtor, which\nresults in a crash (best case).\n\nThis issue was found when running the HMM selftests:\n\n | tools/testing/selftests/mm# ./test_hmm.sh smoke\n | ... # when unloading the test_hmm.ko module\n | page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10915b\n | flags: 0x1000000000000000(node=0|zone=1)\n | raw: 1000000000000000 0000000000000000 dead000000000122 0000000000000000\n | raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000\n | page dumped because: VM_BUG_ON_PAGE(ptdesc->pmd_huge_pte)\n | ------------[ cut here ]------------\n | kernel BUG at include/linux/mm.h:3080!\n | Kernel BUG [#1]\n | Modules linked in: test_hmm(-) sch_fq_codel fuse drm drm_panel_orientation_quirks backlight dm_mod\n | CPU: 1 UID: 0 PID: 514 Comm: modprobe Tainted: G W 6.12.0-00982-gf2a4f1682d07 #2\n | Tainted: [W]=WARN\n | Hardware name: riscv-virtio qemu/qemu, BIOS 2024.10 10/01/2024\n | epc : remove_pgd_mapping+0xbec/0x1070\n | ra : remove_pgd_mapping+0xbec/0x1070\n | epc : ffffffff80010a68 ra : ffffffff80010a68 sp : ff20000000a73940\n | gp : ffffffff827b2d88 tp : ff6000008785da40 t0 : ffffffff80fbce04\n | t1 : 0720072007200720 t2 : 706d756420656761 s0 : ff20000000a73a50\n | s1 : ff6000008915cff8 a0 : 0000000000000039 a1 : 0000000000000008\n | a2 : ff600003fff0de20 a3 : 0000000000000000 a4 : 0000000000000000\n | a5 : 0000000000000000 a6 : c0000000ffffefff a7 : ffffffff824469b8\n | s2 : ff1c0000022456c0 s3 : ff1ffffffdbfffff s4 : ff6000008915c000\n | s5 : ff6000008915c000 s6 : ff6000008915c000 s7 : ff1ffffffdc00000\n | s8 : 0000000000000001 s9 : ff1ffffffdc00000 s10: ffffffff819a31f0\n | s11: ffffffffffffffff t3 : ffffffff8000c950 t4 : ff60000080244f00\n | t5 : ff60000080244000 t6 : ff20000000a73708\n | status: 0000000200000120 badaddr: ffffffff80010a68 cause: 0000000000000003\n | [] remove_pgd_mapping+0xbec/0x1070\n | [] vmemmap_free+0x14/0x1e\n | [] section_deactivate+0x220/0x452\n | [] sparse_remove_section+0x4a/0x58\n | [] __remove_pages+0x7e/0xba\n | [] memunmap_pages+0x2bc/0x3fe\n | [] dmirror_device_remove_chunks+0x2ea/0x518 [test_hmm]\n | [] hmm_dmirror_exit+0x3e/0x1018 [test_hmm]\n | [] __riscv_sys_delete_module+0x15a/0x2a6\n | [] do_trap_ecall_u+0x1f2/0x266\n | [] _new_vmalloc_restore_context_a0+0xc6/0xd2\n | Code: bf51 7597 0184 8593 76a5 854a 4097 0029 80e7 2c00 (9002) 7597\n | ---[ end trace 0000000000000000 ]---\n | Kernel panic - not syncing: Fatal exception in interrupt\n\nAdd a check to avoid calling the pmd dtor, if the calling context is\nvmemmap_free()." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/mm/init.c" ], "versions": [ { "version": "c75a74f4ba19c904c0ae1e011ae2568449409ae4", "lessThan": "344945806f2f7af68be98bac02836c867f223aa9", "status": "affected", "versionType": "git" }, { "version": "c75a74f4ba19c904c0ae1e011ae2568449409ae4", "lessThan": "21f1b85c8912262adf51707e63614a114425eb10", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/mm/init.c" ], "versions": [ { "version": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.6", "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": "6.11", "versionEndExcluding": "6.12.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/344945806f2f7af68be98bac02836c867f223aa9" }, { "url": "https://git.kernel.org/stable/c/21f1b85c8912262adf51707e63614a114425eb10" } ], "title": "riscv: mm: Do not call pmd dtor on vmemmap page table teardown", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-56673", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T19:59:31.187588Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:08.957Z" } } ] } }