CVE-2026-64318

CVE CVE-2026-64318EUVD EUVD-2026-49030Published 2026-07-25T08:49:47.000ZLast changed 2026-08-05T12:40:55.000ZCVSS 7.1

What the advisory describes

In 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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <ce93228e2193a17d2c58b656e439bb39fe5c3af8; patch: 7.1.4; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <5eacdb1967378f5e5591cd27a2d8cdee2df1a599; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <4671bb74bba05fdd4acf670a35758c29e8c97b83; patch: 0; patch: 6.18.39; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <2dc0bfd2fe355fb930de63c2f2eb8ced8570c579; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <b5e9c09309e18fd9839ad007c238120353ca0cc4; patch: 5.15.212; patch: 5.10.261; patch: 7.2-rc1; patch: 6.6.145; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <09861651617ba0fec089e8b9477439e68398c110; patch: 6.12.96; 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <fd94a779020f2ecc8b2607f4c20b34acb1763b9a; patch: 6.1.178; 3.11

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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