{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64318", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.779Z", "datePublished": "2026-07-25T08:49:47.690Z", "dateUpdated": "2026-08-17T04:53:18.783Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:53:18.783Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npartitions: aix: bound the pp_count scan to the ppe array\n\naix_partition() reads the physical volume descriptor into a fixed-size\nstruct pvd and then scans its physical-partition-extent array:\n\n\tint numpps = be16_to_cpu(pvd->pp_count);\n\t...\n\tfor (i = 0; i < numpps; i += 1) {\n\t\tstruct ppe *p = pvd->ppe + i;\n\t\t...\n\t\tlp_ix = be16_to_cpu(p->lp_ix);\n\npvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a\nfixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the\non-disk pp_count. pp_count is an unvalidated __be16 read straight from\nthe descriptor, so a crafted AIX image with pp_count larger than 1016\ndrives the loop to read pvd->ppe[i] past the end of the allocation (up\nto 65535 entries, ~2 MB out of bounds).\n\nThe partition scan runs without mounting anything, when a block device\nwith a crafted AIX/IBM partition table appears (an attacker-supplied\nimage attached with losetup -P, or a device auto-scanned by udev), via\nmsdos_partition() -> aix_partition().\n\nClamp the scan to the number of entries the ppe[] array can hold." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - An attacker with local code execution can supply a crafted image through an unprivileged UDisks loop-setup operation with partition scanning enabled. No network protocol directly invokes this parser.\nAC:L - On an affected build, attacker-controlled on-disk fields deterministically reach the oversized scan without a race or memory-layout requirement for triggering the out-of-bounds access.\nPR:L - A basic active desktop user can request loop setup through UDisks under its default policy, while the kernel loop configuration path itself has no capability check. Initial-namespace root is not required in this deployment.\nUI:N - The attacker can initiate loop setup and partition scanning directly, without requiring another user to mount or open the image.\nS:U - The vulnerable partition parser and the affected kernel memory belong to the same operating-system security authority, with no demonstrated VM, IOMMU, or sandbox boundary crossing.\nC:H - The attacker-controlled count can cause 16-bit reads across nearly 2 MiB beyond the approximately 32 KiB allocation, sampling unrelated kernel memory. This is substantially more than a small bounded disclosure.\nI:N - The faulty accesses are reads; the derived logical-volume index is range-checked, and subsequent writes remain within the allocated lvip and partition-state arrays. No out-of-bounds write or control-flow write primitive is present.\nA:H - The slab out-of-bounds access is KASAN-confirmed and can produce an oops or panic on hardened kernels or when the traversal reaches inaccessible memory. An attacker can repeat partition scans to sustain denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/partitions/aix.c" ], "versions": [ { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "09861651617ba0fec089e8b9477439e68398c110", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "5eacdb1967378f5e5591cd27a2d8cdee2df1a599", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "b5e9c09309e18fd9839ad007c238120353ca0cc4", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "fd94a779020f2ecc8b2607f4c20b34acb1763b9a", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "4671bb74bba05fdd4acf670a35758c29e8c97b83", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "ce93228e2193a17d2c58b656e439bb39fe5c3af8", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e", "status": "affected", "versionType": "git" }, { "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6", "lessThan": "2dc0bfd2fe355fb930de63c2f2eb8ced8570c579", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/partitions/aix.c" ], "versions": [ { "version": "3.11", "status": "affected" }, { "version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "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": "3.11", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/09861651617ba0fec089e8b9477439e68398c110" }, { "url": "https://git.kernel.org/stable/c/5eacdb1967378f5e5591cd27a2d8cdee2df1a599" }, { "url": "https://git.kernel.org/stable/c/b5e9c09309e18fd9839ad007c238120353ca0cc4" }, { "url": "https://git.kernel.org/stable/c/fd94a779020f2ecc8b2607f4c20b34acb1763b9a" }, { "url": "https://git.kernel.org/stable/c/4671bb74bba05fdd4acf670a35758c29e8c97b83" }, { "url": "https://git.kernel.org/stable/c/ce93228e2193a17d2c58b656e439bb39fe5c3af8" }, { "url": "https://git.kernel.org/stable/c/44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e" }, { "url": "https://git.kernel.org/stable/c/2dc0bfd2fe355fb930de63c2f2eb8ced8570c579" } ], "title": "partitions: aix: bound the pp_count scan to the ppe array", "x_generator": { "engine": "bippy-1.2.0" } } } }