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CVE-2026-64318 Affecting linux-6.12 package, versions <6.12.100-1~deb12u1

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.16% (6th percentile)

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  • Snyk IDSNYK-ECHOLATEST-LINUX612-18579172
  • published7 Aug 2026
  • disclosed25 Jul 2026
Report a new vulnerability Found a mistake?

Introduced: 25 Jul 2026

CVE-2026-64318  (opens in a new tab)

How to fix?

Upgrade Echo:latest linux-6.12 to version 6.12.100-1~deb12u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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-&gt;pp_count);
...
for (i = 0; i &lt; numpps; i += 1) {
    struct ppe *p = pvd-&gt;ppe + i;
    ...
    lp_ix = be16_to_cpu(p-&gt;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.