CVE-2026-64582

Kernel crash and page use-after-free via mmap race

Published Aug 5, 2026 · Updated Aug 5, 2026

Use-after-free in the Linux kernel RDMA/rxe component allows local users to crash the kernel or access reallocated pages. rxe_mmap drops pending_lock before taking another reference, so a concurrent destroy ioctl can free the mapping object while remap_vmalloc_range walks its page tables. Exploitation requires configured Soft-RoCE and access to a uverbs device; the crash is repeatable, while retaining a stale mapping to a reused page requires a very short race window.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel RDMA/rxe component allows local users to crash the kernel or access reallocated pages. rxe_mmap drops pending_lock before taking another reference, so a concurrent destroy ioctl can free the mapping object while remap_vmalloc_range walks its page tables. Exploitation requires configured Soft-RoCE and access to a uverbs device; the crash is repeatable, while retaining a stale mapping to a reused page requires a very short race window.

The record

CVE
CVE-2026-64582
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.8
  2. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <3525987a392536f31a484833af258971af63b24c
  3. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <35744ab3d03c5fca8c1752f53fc8fc674e14c561
  4. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <665fb7d22a700c66a78db0cf88c6e6a649aba9d0
  5. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <e038d42cc09ca1da9d3568ce8ae062b2bfb3bc0e
  6. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <e59a6aa89e0fcd1d0707832eb4654fd9ae7d31e6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <3525987a392536f31a484833af258971af63b24c; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <35744ab3d03c5fca8c1752f53fc8fc674e14c561; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <665fb7d22a700c66a78db0cf88c6e6a649aba9d0; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <e038d42cc09ca1da9d3568ce8ae062b2bfb3bc0e; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <e59a6aa89e0fcd1d0707832eb4654fd9ae7d31e6

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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