CVE-2026-64318

{"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"}}}}

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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."}], "id": "CVE-2026-64318", "lastModified": "2026-09-03T15:49:23.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:13.147", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09861651617ba0fec089e8b9477439e68398c110"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2dc0bfd2fe355fb930de63c2f2eb8ced8570c579"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4671bb74bba05fdd4acf670a35758c29e8c97b83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5eacdb1967378f5e5591cd27a2d8cdee2df1a599"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5e9c09309e18fd9839ad007c238120353ca0cc4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce93228e2193a17d2c58b656e439bb39fe5c3af8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fd94a779020f2ecc8b2607f4c20b34acb1763b9a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: partitions: aix: bound the pp_count scan to the ppe array", "id": "2507047", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507047"}, "csaw": false, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's AIX partition handling. A local attacker can provide a specially crafted AIX/IBM partition table on a block device. When the kernel scans this device, the `aix_partition()` function reads an unvalidated `pp_count` value, causing it to read beyond the allocated buffer. This out-of-bounds read can lead to information disclosure, potentially revealing sensitive kernel memory, and may also result in a denial of service."], "name": "CVE-2026-64318", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "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": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64318\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64318\nhttps://lore.kernel.org/linux-cve-announce/2026072510-CVE-2026-64318-c976@gregkh/T"]}

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