partitions: aix: bound the pp_count scan to the ppe array

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64318
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:13 UTC
Updated2026-07-27 05:16:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: partitions: aix: bound the pp_count scan to the ppe array aix_partition() reads the physical volume descriptor into a fixed-size struct pvd and then scans its physical-partition-extent array: int numpps = be16_to_cpu(pvd->pp_count); ... for (i = 0; i < numpps; i += 1) { struct ppe *p = pvd->ppe + i; ... lp_ix = be16_to_cpu(p->lp_ix); pvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a fixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the on-disk pp_count. pp_count is an unvalidated __be16 read straight from the descriptor, so a crafted AIX image with pp_count larger than 1016 drives the loop to read pvd->ppe[i] past the end of the allocation (up to 65535 entries, ~2 MB out of bounds). The partition scan runs without mounting anything, when a block device with a crafted AIX/IBM partition table appears (an attacker-supplied image attached with losetup -P, or a device auto-scanned by udev), via msdos_partition() -> aix_partition(). Clamp the scan to the number of entries the ppe[] array can hold.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.001600000 probability, percentile 0.055780000 (date 2026-07-29)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 09861651617ba0fec089e8b9477439e68398c110 git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 5eacdb1967378f5e5591cd27a2d8cdee2df1a599 git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 b5e9c09309e18fd9839ad007c238120353ca0cc4 git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 fd94a779020f2ecc8b2607f4c20b34acb1763b9a git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 4671bb74bba05fdd4acf670a35758c29e8c97b83 git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 ce93228e2193a17d2c58b656e439bb39fe5c3af8 git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e git Not specified
CNA Linux Linux affected 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 2dc0bfd2fe355fb930de63c2f2eb8ced8570c579 git Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fd94a779020f2ecc8b2607f4c20b34acb1763b9a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09861651617ba0fec089e8b9477439e68398c110 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5eacdb1967378f5e5591cd27a2d8cdee2df1a599 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce93228e2193a17d2c58b656e439bb39fe5c3af8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b5e9c09309e18fd9839ad007c238120353ca0cc4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4671bb74bba05fdd4acf670a35758c29e8c97b83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2dc0bfd2fe355fb930de63c2f2eb8ced8570c579 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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