CVE-2026-74518

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74518", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.910Z", "datePublished": "2026-08-15T12:27:37.480Z", "dateUpdated": "2026-10-16T19:05:52.396Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:38:19.402Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix list corruption in allocate_file_region_entries()\n\nallocate_file_region_entries() tops up resv->region_cache with freshly\nallocated file_region descriptors. The allocation uses GFP_KERNEL, so\nresv->lock is dropped around it: the new entries are gathered on a\nstack-local list head, allocated_regions, and spliced into\nresv->region_cache once the lock is re-acquired.\n\nThe splice used list_splice(), which moves the entries but does not\nre-initialize the source head, so allocated_regions is left pointing at an\nentry that now lives on resv->region_cache. The top-up runs in a while\nloop that re-checks the cache deficit after re-acquiring the lock. For a\nshared mapping the resv_map is shared by every mapper of the hugetlbfs\ninode, so a concurrent region_chg()/region_add()/region_del() on the same\nresv_map can consume cache entries during the unlocked window and force a\nsecond iteration. That iteration calls list_add() on the stale head and\ncorrupts the list; with CONFIG_DEBUG_LIST the __list_add_valid() check\ntrips:\n\n list_add corruption. next->prev should be prev (ffffc900011ff7f8),\n but was ffff88814c281460. (next=ffff88814c545640).\n kernel BUG at lib/list_debug.c:31!\n allocate_file_region_entries+0x191/0x420\n region_chg+0x267/0x300\n hugetlb_reserve_pages+0x387/0xc80\n hugetlbfs_file_mmap+0x2ce/0x3f0\n mmap_region+0x1348/0x1a80\n do_mmap+0x85e/0xb90\n vm_mmap_pgoff+0x18c/0x330\n ksys_mmap_pgoff+0x2a1/0x3e0\n do_syscall_64+0xd7/0x420\n\nWithout CONFIG_DEBUG_LIST the bad list_add() silently links a kernel-stack\naddress into resv->region_cache, leading to later use-after-free.\n\nThis was observed as a real host panic on a dense KVM host where a QEMU\nguest-RAM hugetlbfs file was mapped MAP_SHARED by both QEMU and a separate\nSPDK/DPDK vhost-user target, generating concurrent region_* traffic on one\nshared resv_map.\n\nUse list_splice_init() so the source head is re-initialized empty after\neach splice, making the retry loop safe."}], "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 bug is reached only through local hugetlb reservation paths (mmap/memfd_create/fault syscalls into region_chg/region_add/region_del); no network protocol or remote packet handler invokes allocate_file_region_entries().\nAC:L - Exploitation needs a race while resv->lock is dropped during GFP_KERNEL allocation, but an attacker can spawn concurrent MAP_SHARED mappers/faulters on one hugetlb inode and controls both sides of that race.\nPR:L - Unprivileged local users can trigger this via memfd_create(MFD_HUGETLB) plus MAP_SHARED mmap/fault activity, or by mapping accessible shared hugetlbfs files, without init-namespace root or special capabilities.\nUI:N - No victim interaction is required; the attacker drives the needed concurrent syscalls and shared hugetlb mappings themselves to hit the corrupted list splice retry path.\nS:U - Impact is kernel hugetlb resv_map list/memory corruption on the host; it does not by itself cross a VM, IOMMU, or separate security-authority boundary even though KVM/DPDK hosts are a prime deployment.\nC:H - Without CONFIG_DEBUG_LIST, stale list_splice leaves a kernel-stack pointer in resv->region_cache, producing later use-after-free that can be turned into arbitrary kernel memory read/disclosure primitives.\nI:H - Corrupted region_cache pointers let subsequent region_add/region_del/cache operations write through attacker-influenced list links, enabling heap metadata corruption and potential arbitrary kernel write or code execution.\nA:H - Real host panics were reported on dense KVM hugetlb workloads; DEBUG_LIST kernels BUG on list_add corruption, and default builds can crash from UAF while walking the poisoned region_cache."}]}], "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": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "01b8569233e47693d6ff7efa96d9854c55f936fc", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "9c5fdffc5e1ce84403c58289ee72697051803bf7", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "62e1c2741a4d923d9854efd5927a6212aad7a187", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "587a0accc2b4fccc5cf7baf0fe34e50efde51f9c", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "ac1bb7fd45088d0db57a22ce7729f258ebd63cf5", "status": "affected", "versionType": "git"}, {"version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "dd9623f58ec702a07b2d67179d6fcea79c52231a", "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": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.10", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/01b8569233e47693d6ff7efa96d9854c55f936fc"}, {"url": "https://git.kernel.org/stable/c/9c5fdffc5e1ce84403c58289ee72697051803bf7"}, {"url": "https://git.kernel.org/stable/c/f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3"}, {"url": "https://git.kernel.org/stable/c/62e1c2741a4d923d9854efd5927a6212aad7a187"}, {"url": "https://git.kernel.org/stable/c/587a0accc2b4fccc5cf7baf0fe34e50efde51f9c"}, {"url": "https://git.kernel.org/stable/c/126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df"}, {"url": "https://git.kernel.org/stable/c/ac1bb7fd45088d0db57a22ce7729f258ebd63cf5"}, {"url": "https://git.kernel.org/stable/c/dd9623f58ec702a07b2d67179d6fcea79c52231a"}], "title": "mm/hugetlb: fix list corruption in allocate_file_region_entries()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74518", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:58:55.418677Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:52.396Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74518", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:58:55.418677Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:58:56.027Z"}}], "cna": {"title": "mm/hugetlb: fix list corruption in allocate_file_region_entries()", "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 bug is reached only through local hugetlb reservation paths (mmap/memfd_create/fault syscalls into region_chg/region_add/region_del); no network protocol or remote packet handler invokes allocate_file_region_entries().\nAC:L - Exploitation needs a race while resv->lock is dropped during GFP_KERNEL allocation, but an attacker can spawn concurrent MAP_SHARED mappers/faulters on one hugetlb inode and controls both sides of that race.\nPR:L - Unprivileged local users can trigger this via memfd_create(MFD_HUGETLB) plus MAP_SHARED mmap/fault activity, or by mapping accessible shared hugetlbfs files, without init-namespace root or special capabilities.\nUI:N - No victim interaction is required; the attacker drives the needed concurrent syscalls and shared hugetlb mappings themselves to hit the corrupted list splice retry path.\nS:U - Impact is kernel hugetlb resv_map list/memory corruption on the host; it does not by itself cross a VM, IOMMU, or separate security-authority boundary even though KVM/DPDK hosts are a prime deployment.\nC:H - Without CONFIG_DEBUG_LIST, stale list_splice leaves a kernel-stack pointer in resv->region_cache, producing later use-after-free that can be turned into arbitrary kernel memory read/disclosure primitives.\nI:H - Corrupted region_cache pointers let subsequent region_add/region_del/cache operations write through attacker-influenced list links, enabling heap metadata corruption and potential arbitrary kernel write or code execution.\nA:H - Real host panics were reported on dense KVM hugetlb workloads; DEBUG_LIST kernels BUG on list_add corruption, and default builds can crash from UAF while walking the poisoned region_cache."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "01b8569233e47693d6ff7efa96d9854c55f936fc", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "9c5fdffc5e1ce84403c58289ee72697051803bf7", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "62e1c2741a4d923d9854efd5927a6212aad7a187", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "587a0accc2b4fccc5cf7baf0fe34e50efde51f9c", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "ac1bb7fd45088d0db57a22ce7729f258ebd63cf5", "versionType": "git"}, {"status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "lessThan": "dd9623f58ec702a07b2d67179d6fcea79c52231a", "versionType": "git"}], "programFiles": ["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": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.151", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/hugetlb.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/01b8569233e47693d6ff7efa96d9854c55f936fc"}, {"url": "https://git.kernel.org/stable/c/9c5fdffc5e1ce84403c58289ee72697051803bf7"}, {"url": "https://git.kernel.org/stable/c/f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3"}, {"url": "https://git.kernel.org/stable/c/62e1c2741a4d923d9854efd5927a6212aad7a187"}, {"url": "https://git.kernel.org/stable/c/587a0accc2b4fccc5cf7baf0fe34e50efde51f9c"}, {"url": "https://git.kernel.org/stable/c/126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df"}, {"url": "https://git.kernel.org/stable/c/ac1bb7fd45088d0db57a22ce7729f258ebd63cf5"}, {"url": "https://git.kernel.org/stable/c/dd9623f58ec702a07b2d67179d6fcea79c52231a"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix list corruption in allocate_file_region_entries()\n\nallocate_file_region_entries() tops up resv->region_cache with freshly\nallocated file_region descriptors. The allocation uses GFP_KERNEL, so\nresv->lock is dropped around it: the new entries are gathered on a\nstack-local list head, allocated_regions, and spliced into\nresv->region_cache once the lock is re-acquired.\n\nThe splice used list_splice(), which moves the entries but does not\nre-initialize the source head, so allocated_regions is left pointing at an\nentry that now lives on resv->region_cache. The top-up runs in a while\nloop that re-checks the cache deficit after re-acquiring the lock. For a\nshared mapping the resv_map is shared by every mapper of the hugetlbfs\ninode, so a concurrent region_chg()/region_add()/region_del() on the same\nresv_map can consume cache entries during the unlocked window and force a\nsecond iteration. That iteration calls list_add() on the stale head and\ncorrupts the list; with CONFIG_DEBUG_LIST the __list_add_valid() check\ntrips:\n\n list_add corruption. next->prev should be prev (ffffc900011ff7f8),\n but was ffff88814c281460. (next=ffff88814c545640).\n kernel BUG at lib/list_debug.c:31!\n allocate_file_region_entries+0x191/0x420\n region_chg+0x267/0x300\n hugetlb_reserve_pages+0x387/0xc80\n hugetlbfs_file_mmap+0x2ce/0x3f0\n mmap_region+0x1348/0x1a80\n do_mmap+0x85e/0xb90\n vm_mmap_pgoff+0x18c/0x330\n ksys_mmap_pgoff+0x2a1/0x3e0\n do_syscall_64+0xd7/0x420\n\nWithout CONFIG_DEBUG_LIST the bad list_add() silently links a kernel-stack\naddress into resv->region_cache, leading to later use-after-free.\n\nThis was observed as a real host panic on a dense KVM host where a QEMU\nguest-RAM hugetlbfs file was mapped MAP_SHARED by both QEMU and a separate\nSPDK/DPDK vhost-user target, generating concurrent region_* traffic on one\nshared resv_map.\n\nUse list_splice_init() so the source head is re-initialized empty after\neach splice, making the retry loop safe."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.151", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.103", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.44", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.8", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:38:19.402Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74518", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:52.396Z", "dateReserved": "2026-08-15T05:44:03.910Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T12:27:37.480Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"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": "01b8569233e47693d6ff7efa96d9854c55f936fc", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "9c5fdffc5e1ce84403c58289ee72697051803bf7", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "62e1c2741a4d923d9854efd5927a6212aad7a187", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "587a0accc2b4fccc5cf7baf0fe34e50efde51f9c", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "ac1bb7fd45088d0db57a22ce7729f258ebd63cf5", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "versionType": "git"}, {"lessThan": "dd9623f58ec702a07b2d67179d6fcea79c52231a", "status": "affected", "version": "d3ec7b6e09e512ba902b86bcca2c512fb06d492f", "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": "5.10"}, {"lessThan": "5.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix list corruption in allocate_file_region_entries()\n\nallocate_file_region_entries() tops up resv->region_cache with freshly\nallocated file_region descriptors. The allocation uses GFP_KERNEL, so\nresv->lock is dropped around it: the new entries are gathered on a\nstack-local list head, allocated_regions, and spliced into\nresv->region_cache once the lock is re-acquired.\n\nThe splice used list_splice(), which moves the entries but does not\nre-initialize the source head, so allocated_regions is left pointing at an\nentry that now lives on resv->region_cache. The top-up runs in a while\nloop that re-checks the cache deficit after re-acquiring the lock. For a\nshared mapping the resv_map is shared by every mapper of the hugetlbfs\ninode, so a concurrent region_chg()/region_add()/region_del() on the same\nresv_map can consume cache entries during the unlocked window and force a\nsecond iteration. That iteration calls list_add() on the stale head and\ncorrupts the list; with CONFIG_DEBUG_LIST the __list_add_valid() check\ntrips:\n\n list_add corruption. next->prev should be prev (ffffc900011ff7f8),\n but was ffff88814c281460. (next=ffff88814c545640).\n kernel BUG at lib/list_debug.c:31!\n allocate_file_region_entries+0x191/0x420\n region_chg+0x267/0x300\n hugetlb_reserve_pages+0x387/0xc80\n hugetlbfs_file_mmap+0x2ce/0x3f0\n mmap_region+0x1348/0x1a80\n do_mmap+0x85e/0xb90\n vm_mmap_pgoff+0x18c/0x330\n ksys_mmap_pgoff+0x2a1/0x3e0\n do_syscall_64+0xd7/0x420\n\nWithout CONFIG_DEBUG_LIST the bad list_add() silently links a kernel-stack\naddress into resv->region_cache, leading to later use-after-free.\n\nThis was observed as a real host panic on a dense KVM host where a QEMU\nguest-RAM hugetlbfs file was mapped MAP_SHARED by both QEMU and a separate\nSPDK/DPDK vhost-user target, generating concurrent region_* traffic on one\nshared resv_map.\n\nUse list_splice_init() so the source head is re-initialized empty after\neach splice, making the retry loop safe."}], "id": "CVE-2026-74518", "lastModified": "2026-10-16T20:17:34.450", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74518", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:58:55.418677Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:17:56.967", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/01b8569233e47693d6ff7efa96d9854c55f936fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/587a0accc2b4fccc5cf7baf0fe34e50efde51f9c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/62e1c2741a4d923d9854efd5927a6212aad7a187"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9c5fdffc5e1ce84403c58289ee72697051803bf7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ac1bb7fd45088d0db57a22ce7729f258ebd63cf5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dd9623f58ec702a07b2d67179d6fcea79c52231a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3e54f6a5e1681f83d13e8716bc92ef5ecf121d3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: mm/hugetlb: fix list corruption in allocate_file_region_entries()", "id": "2517004", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517004"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/hugetlb: fix list corruption in allocate_file_region_entries()\nallocate_file_region_entries() tops up resv->region_cache with freshly\nallocated file_region descriptors. The allocation uses GFP_KERNEL, so\nresv->lock is dropped around it: the new entries are gathered on a\nstack-local list head, allocated_regions, and spliced into\nresv->region_cache once the lock is re-acquired.\nThe splice used list_splice(), which moves the entries but does not\nre-initialize the source head, so allocated_regions is left pointing at an\nentry that now lives on resv->region_cache. The top-up runs in a while\nloop that re-checks the cache deficit after re-acquiring the lock. For a\nshared mapping the resv_map is shared by every mapper of the hugetlbfs\ninode, so a concurrent region_chg()/region_add()/region_del() on the same\nresv_map can consume cache entries during the unlocked window and force a\nsecond iteration. That iteration calls list_add() on the stale head and\ncorrupts the list; with CONFIG_DEBUG_LIST the __list_add_valid() check\ntrips:\nlist_add corruption. next->prev should be prev (ffffc900011ff7f8),\nbut was ffff88814c281460. (next=ffff88814c545640).\nkernel BUG at lib/list_debug.c:31!\nallocate_file_region_entries+0x191/0x420\nregion_chg+0x267/0x300\nhugetlb_reserve_pages+0x387/0xc80\nhugetlbfs_file_mmap+0x2ce/0x3f0\nmmap_region+0x1348/0x1a80\ndo_mmap+0x85e/0xb90\nvm_mmap_pgoff+0x18c/0x330\nksys_mmap_pgoff+0x2a1/0x3e0\ndo_syscall_64+0xd7/0x420\nWithout CONFIG_DEBUG_LIST the bad list_add() silently links a kernel-stack\naddress into resv->region_cache, leading to later use-after-free.\nThis was observed as a real host panic on a dense KVM host where a QEMU\nguest-RAM hugetlbfs file was mapped MAP_SHARED by both QEMU and a separate\nSPDK/DPDK vhost-user target, generating concurrent region_* traffic on one\nshared resv_map.\nUse list_splice_init() so the source head is re-initialized empty after\neach splice, making the retry loop safe.", "A flaw was found in the Linux kernel. The allocate_file_region_entries() function, responsible for managing huge page memory regions, can suffer from list corruption. This occurs because the list_splice() operation does not properly re-initialize a list head, allowing concurrent access to shared memory maps to corrupt the internal data structure. An attacker could exploit this to cause a kernel panic, leading to a Denial of Service, or potentially a use-after-free condition."], "name": "CVE-2026-74518", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74518\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74518\nhttps://lore.kernel.org/linux-cve-announce/2026081544-CVE-2026-74518-1152@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3ec7b6e09e512ba902b86bcca2c512fb06d492f,62e1c2741a4d923d9854efd5927a6212aad7a187)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3ec7b6e09e512ba902b86bcca2c512fb06d492f,587a0accc2b4fccc5cf7baf0fe34e50efde51f9c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3ec7b6e09e512ba902b86bcca2c512fb06d492f,126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3ec7b6e09e512ba902b86bcca2c512fb06d492f,ac1bb7fd45088d0db57a22ce7729f258ebd63cf5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d3ec7b6e09e512ba902b86bcca2c512fb06d492f,dd9623f58ec702a07b2d67179d6fcea79c52231a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T17:30:11.723299+00:00", "updated": "2026-08-22T05:00:13.391055+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}