CVE-2024-39477

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This is because\nvma_needs_reservation() can return -ENOMEM if\nallocate_file_region_entries() fails to allocate the file_region struct\nfor the reservation.\n\nCheck for that and do not call vma_add_reservation() if that is the case,\notherwise region_abort() and region_del() will see that we do not have any\nfile_regions.\n\nIf we detect that vma_needs_reservation() returned -ENOMEM, we clear the\nhugetlb_restore_reserve flag as if this reservation was still consumed, so\nfree_huge_folio() will not increment the resv count.\n\n[1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa"}], "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 only through local syscalls on the attacker's own address space \u2014 mmap(MAP_HUGETLB), madvise(MADV_DONTNEED), munmap, or process exit driving __unmap_hugepage_range(). There is no network- or adjacent-reachable trigger.\nAC:L - Every element of the trigger is attacker-controlled and deterministic \u2014 the private anonymous hugetlb VMA, the merged reservation region, the drained region_cache, and the middle-page unmap that forces region_del()'s split path; only the file_region kmalloc failure must be induced, which an attacker does by driving memory exhaustion (hugetlb hosts are already memory-tight, and a task that becomes an OOM victim has its GFP_KERNEL allocations fail while exit_mmap runs this exact code). Once the single ENOMEM lands, adds_in_progress stays at -1 permanently and the corruption repeats on ordinary faults without further allocation failures, so the attempt can be retried indefinitely.\nPR:L - A plain unprivileged local user suffices: hugetlb_file_setup() gates only SHM_HUGETLB on CAP_IPC_LOCK, so anonymous MAP_PRIVATE|MAP_HUGETLB mmap and MADV_DONTNEED on the resulting VMA require no capability. A non-zero hugepage pool is an administrator-side configuration, standard on database, KVM, DPDK and HPC hosts, not a privilege held by the attacker.\nUI:N - The attacker's own process performs the entire sequence \u2014 mmap, fault-in, madvise/munmap \u2014 with no action by any other user or victim process.\nS:U - The corruption is confined to kernel heap objects (struct resv_map and the slab freelist) within the same security authority; no VM, hypervisor, or IOMMU boundary is crossed.\nC:H - region_del() and get_file_region_entry_from_cache() fabricate a file_region pointing at the resv_map itself and then kfree() that interior pointer while the object is still live, producing overlapping slab objects and a freelist containing a misaligned pointer \u2014 a well-known route to reading adjacent kernel heap contents. The corrupted rw_semaphore also breaks the serialization of hugetlb page-table walks against unmapping, widening the disclosure surface.\nI:H - The bogus file_region overlays struct resv_map, so nrg->from/nrg->to and copy_hugetlb_cgroup_uncharge_info() perform out-of-bounds writes over region_cache_count and the rw_semaphore (count, owner, wait_lock) that guards private hugetlb page tables, and kfree() of an interior pointer corrupts the SLUB freelist \u2014 a controllable heap-grooming primitive toward arbitrary write and control-flow hijack. The reservation accounting is also permanently falsified, letting one process steal huge pages reserved by another.\nA:H - On CONFIG_DEBUG_VM kernels this is an immediate panic via VM_BUG_ON(!resv->region_cache_count) in region_abort() and VM_BUG_ON(adds_in_progress) in resv_map_release() \u2014 precisely the syzbot splat. Without DEBUG_VM the list poisoning, wrecked rw_semaphore (hangs/deadlock in hugetlb faults), slab corruption, and permanently inflated h->resv_huge_pages produce oopses and SIGBUS-level denial of hugepages for every user on the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/hugetlb.c"], "versions": [{"version": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3", "lessThan": "aa998f9dcb34c28448f86e8f5490f20d5eb0eac7", "status": "affected", "versionType": "git"}, {"version": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3", "lessThan": "8daf9c702ee7f825f0de8600abff764acfedea13", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/hugetlb.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.5", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "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": "6.9", "versionEndExcluding": "6.9.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7"}, {"url": "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13"}], "title": "mm/hugetlb: do not call vma_add_reservation upon ENOMEM", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:26:15.943Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-39477", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T17:07:38.781989Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:39.612Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/hugetlb.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "aa998f9dcb34c28448f86e8f5490f20d5eb0eac7", "status": "affected", "version": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3", "versionType": "git"}, {"lessThan": "8daf9c702ee7f825f0de8600abff764acfedea13", "status": "affected", "version": "df7a6d1f64056aec572162c5d35ed9ff86ece6f3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/hugetlb.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.9.*", "status": "unaffected", "version": "6.9.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "54EDFD02-25E6-4BC8-9AD0-0A59881F400A", "versionEndExcluding": "6.9.5", "versionStartIncluding": "6.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "C40DD2D9-90E3-4E95-9F1A-E7C680F11F2A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.10.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "54D5209E-E390-45C5-A5D1-C9EDB40819F7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: do not call vma_add_reservation upon ENOMEM\n\nsysbot reported a splat [1] on __unmap_hugepage_range(). This is because\nvma_needs_reservation() can return -ENOMEM if\nallocate_file_region_entries() fails to allocate the file_region struct\nfor the reservation.\n\nCheck for that and do not call vma_add_reservation() if that is the case,\notherwise region_abort() and region_del() will see that we do not have any\nfile_regions.\n\nIf we detect that vma_needs_reservation() returned -ENOMEM, we clear the\nhugetlb_restore_reserve flag as if this reservation was still consumed, so\nfree_huge_folio() will not increment the resv count.\n\n[1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mm/hugetlb: no llame a vma_add_reservation cuando ENOMEM sysbot inform\u00f3 un splat [1] en __unmap_hugepage_range(). Esto se debe a que vma_needs_reservation() puede devolver -ENOMEM si allocate_file_region_entries() no puede asignar la estructura file_region para la reserva. Verifique eso y no llame a vma_add_reservation() si ese es el caso; de lo contrario, region_abort() y region_del() ver\u00e1n que no tenemos ning\u00fan file_regions. Si detectamos que vma_needs_reservation() devolvi\u00f3 -ENOMEM, borramos el indicador hugetlb_restore_reserve como si esta reserva todav\u00eda estuviera consumida, por lo que free_huge_folio() no incrementar\u00e1 el recuento de resv. [1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa"}], "id": "CVE-2024-39477", "lastModified": "2026-08-04T11:18:57.740", "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-2024-39477", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:07:38.781989Z", "version": "2.0.3"}}]}, "published": "2024-07-05T07:15:10.413", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/hugetlb: do not call vma_add_reservation upon ENOMEM", "id": "2296063", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2296063"}, "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-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/hugetlb: do not call vma_add_reservation upon ENOMEM\nsysbot reported a splat [1] on __unmap_hugepage_range(). This is because\nvma_needs_reservation() can return -ENOMEM if\nallocate_file_region_entries() fails to allocate the file_region struct\nfor the reservation.\nCheck for that and do not call vma_add_reservation() if that is the case,\notherwise region_abort() and region_del() will see that we do not have any\nfile_regions.\nIf we detect that vma_needs_reservation() returned -ENOMEM, we clear the\nhugetlb_restore_reserve flag as if this reservation was still consumed, so\nfree_huge_folio() will not increment the resv count.\n[1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa"], "name": "CVE-2024-39477", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-39477\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-39477\nhttps://lore.kernel.org/linux-cve-announce/2024070519-CVE-2024-39477-5c3f@gregkh/T"], "threat_severity": "Low"}

{}