{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54135", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:52.522Z", "datePublished": "2025-12-24T13:06:51.329Z", "dateUpdated": "2026-08-05T09:17:33.212Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:33.212Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmaple_tree: fix potential out-of-bounds access in mas_wr_end_piv()\n\nCheck the write offset end bounds before using it as the offset into the\npivot array. This avoids a possible out-of-bounds access on the pivot\narray if the write extends to the last slot in the node, in which case the\nnode maximum should be used as the end pivot.\n\nakpm: this doesn't affect any current callers, but new users of mapletree\nmay encounter this problem if backported into earlier kernels, so let's\nfix it in -stable kernels in case of this." } ], "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 maple tree write path is reached only through local syscalls — `mmap()`, `munmap()`, `mprotect()`, `mremap()`, `brk()` via `vma_iter_store*()`/`vma_iter_clear*()` → `mas_store_gfp()`/`mas_store_prealloc()` → `mas_wr_end_piv()`. The other in-tree users (btrfs send LRU cache, regcache-maple) are likewise local/driver-internal, with no remote packet-processing path.\nAC:L - The trigger is a completely full 16-slot leaf node plus a store whose range starts in an earlier slot and ends inside the final slot — a tree shape an unprivileged attacker deterministically constructs by creating thousands of non-mergeable VMAs and then unmapping a spanning range. No race and no memory layout outside the attacker's influence is involved.\nPR:L - Any unprivileged local process reaches the code with plain `mmap()`/`munmap()` calls on its own address space; there is no capability check, LSM gate, or namespace requirement anywhere along `do_vmi_align_munmap()` → `vma_iter_clear_gfp()` → `mas_wr_store_entry()`.\nUI:N - The attacking process triggers the faulty write path entirely through its own address-space syscalls; no victim action, mount, or file open is required.\nS:U - The out-of-bounds pivot read and the resulting maple-tree corruption are confined to the kernel's own memory-management structures, which are the same security authority as the compromised kernel. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The array overrun reads a live kernel pointer (`slot[0]`, a `struct vm_area_struct *`) and turns it into a range boundary, and the resulting `mas->last`/`new_end` corruption leaves stale VMA pointers and bogus ranges in the VMA tree — memory corruption that can be leveraged into an arbitrary-read primitive, and whose pivot values are indirectly observable through mmap gap placement.\nI:H - A bogus `end_piv` propagates into `mas_wr_extend_null()`, which can set `mas->last` to a kernel heap pointer value beyond the node's `mas->max`, and into `mas_wr_node_store()`'s `new_end` computation, causing the store to overwrite the wrong ranges and leave stale slots — VMA-tree corruption exploitable for use-after-free and arbitrary-write primitives.\nA:H - Writing a range past the node maximum and leaving stale slots violates maple-tree invariants, producing `MT_BUG_ON`/`VM_BUG_ON` hits, oopses, or use-after-free on `vm_area_struct` during any subsequent tree walk or address-space teardown, crashing the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/maple_tree.c" ], "versions": [ { "version": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa", "lessThan": "4e2ad53ababeaac44d71162650984abfe783960c", "status": "affected", "versionType": "git" }, { "version": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa", "lessThan": "dc4751bd4aba01ccfc02f91adfeee0ba4cda405c", "status": "affected", "versionType": "git" }, { "version": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa", "lessThan": "f5fcf6555a2a4f32947d17b92b173837cc652891", "status": "affected", "versionType": "git" }, { "version": "54a611b605901c7d5d05b6b8f5d04a6ceb0962aa", "lessThan": "cd00dd2585c4158e81fdfac0bbcc0446afbad26d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/maple_tree.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.37", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.11", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.1", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "6.1", "versionEndExcluding": "6.1.37" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.3.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.4.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/4e2ad53ababeaac44d71162650984abfe783960c" }, { "url": "https://git.kernel.org/stable/c/dc4751bd4aba01ccfc02f91adfeee0ba4cda405c" }, { "url": "https://git.kernel.org/stable/c/f5fcf6555a2a4f32947d17b92b173837cc652891" }, { "url": "https://git.kernel.org/stable/c/cd00dd2585c4158e81fdfac0bbcc0446afbad26d" } ], "title": "maple_tree: fix potential out-of-bounds access in mas_wr_end_piv()", "x_generator": { "engine": "bippy-1.2.0" } } } }