CVE-2026-64267

CVE CVE-2026-64267EUVD EUVD-2026-48979Published 2026-07-25T08:49:15.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: fuse: avoid 32-bit prune notification count wrap FUSE_NOTIFY_PRUNE validates the nodeid payload length with: size - sizeof(outarg) != outarg.count * sizeof(u64) On 32-bit kernels, size_t is also 32 bits, so the daemon-controlled count multiplication can wrap. A prune notification with count 0x20000000 and no nodeid payload passes the check, enters the copy loop, and asks the device copy path to read nodeids that are not present in the userspace write buffer. In QEMU this reaches the fuse_copy_fill() BUG_ON(!err) path. Validate the payload length with array_size() instead. That accepts exactly the same valid messages, but avoids wrapping arithmetic before the copy loop consumes the count.

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 3f29d59e92a96d843c2ff10ebfed92ac26878658 <6e2d84fdeac05bfd858e84a76353fdb84f23a43e; patch: 7.1.4; patch: 0; 3f29d59e92a96d843c2ff10ebfed92ac26878658 <54243797cedf55447b4c5d560e8cd709900061ae; 6.18; 3f29d59e92a96d843c2ff10ebfed92ac26878658 <c78c4b242299bc581e4987e5c2786c6f4760c516; patch: 6.18.39; patch: 7.2-rc1

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

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.