NVD / CVE Program· CNA Linux

CVE-2026-64115: vsock/vmci: fix UAF when peer resets connection during handshake

Noroxi assessment

Priority: Monitor (action score 35/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 1dd531e28f61edd286edc486ab068f135b5ae1eb, 1e19f08552b90070ed18bafb1763c78297823af6, 440447699c681e26ed58e9c309cad718270a18b4.

Low priority for now. Upgrade to Linux Linux 1dd531e28f61edd286edc486ab068f135b5ae1eb, 1e19f08552b90070ed18bafb1763c78297823af6, 440447699c681e26ed58e9c309cad718270a18b4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix UAF when peer resets connection during handshake vmci_transport_recv_connecting_server() returned err = 0 for a peer RST in its default switch arm: err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; That made vmci_transport_recv_listen() skip vsock_remove_pending(), leaving the pending socket on the listener's pending_links with sk_state = TCP_CLOSE while destroy: still dropped the explicit reference taken before schedule_delayed_work(). One second later vsock_pending_work() observed is_pending=true and performed full cleanup: vsock_remove_pending() then the two trailing sock_put(sk) calls -- the first reached refcount 0 and __sk_freed the socket, and the second wrote into the freed object: BUG: KASAN: slab-use-after-free in refcount_warn_saturate Write of size 4 at addr ffff88800b1cac80 by task kworker Workqueue: events vsock_pending_work Treat peer RST like any other unexpected packet type (err = -EINVAL). All destroy: arms now return err < 0, so vmci_transport_recv_listen() removes pending from pending_links synchronously and vsock_pending_work() takes the is_pending=false / !rejected branch, dropping only its own work reference. This also closes the multi-packet race Sashiko reported on v2: pending is removed from the list before any subsequent packet can find it. The pre-existing sk_acceptq_removed() gap on the err < 0 path of vmci_transport_recv_listen() that Sashiko also noted is not introduced or changed by this patch. Tested on lts-6.12.79 with KASAN: 52/100 unpatched -> 0/100 patched.

HighCVSS 8.8 · v3.1—No exploit Fix available

Memory safety

Published: Jul 19, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 8.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel3.9 and later · before 5.10.258
linux linux kernel5.11 and later · before 5.15.209
linux linux kernel5.16 and later · before 6.1.175
linux linux kernel6.2 and later · before 6.6.142
linux linux kernel6.7 and later · before 6.12.92
linux linux kernel6.13 and later · before 6.18.34
linux linux kernel6.19 and later · before 7.0.11
linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 3.9affected
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before 1e19f08552b90070ed18bafb1763c78297823af6affected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before 1dd531e28f61edd286edc486ab068f135b5ae1ebaffected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before ecda37f8faab3220da199335e42564cb7a9ad145affected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cbaffected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before 47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9affected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before 440447699c681e26ed58e9c309cad718270a18b4affected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before 9fe74e42914c851d68069713b7b917a9c33faf26affected · git
- d021c344051af91f42c5ba9fdedc176740cbd238 and later · before 99e22ddf4edb63dc8382bc028af928056d3450cfaffected · git
- before 3.9not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:10	kernel	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug-devel	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug-devel-matched	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug-modules	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug-modules-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-debug-modules-extra	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-devel	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-devel-matched	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-modules	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-modules-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-64k-modules-extra	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-abi-stablelists	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-cross-headers	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-debug	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-debug-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-debug-devel	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-debug-devel-matched	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-debug-modules	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2
AlmaLinux:10	kernel-debug-modules-core	before 6.12.0-211.64.1.el10_2	6.12.0-211.64.1.el10_2

+96

Same product

linux: all records

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Published before and after this one in the same product

← EarlierCVE-2026-64113Jul 19, 2026 · ixgbevf: fix use-after-free in VEPA multicast source pruning
39Monitor
← EarlierCVE-2026-64114Jul 19, 2026 · ipv4: raw: reject IP_HDRINCL packets with ihl < 5
31Monitor
Later →CVE-2026-64117Jul 19, 2026 · wifi: mac80211: capture fast-RX rate before mesh reuses skb->cb
35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	1dd531e28f61edd286edc486ab068f135b5ae1eb	Vendor (CNA)
Linux Linux	1e19f08552b90070ed18bafb1763c78297823af6	Vendor (CNA)
Linux Linux	440447699c681e26ed58e9c309cad718270a18b4	Vendor (CNA)
Linux Linux	47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9	Vendor (CNA)
Linux Linux	99e22ddf4edb63dc8382bc028af928056d3450cf	Vendor (CNA)
Linux Linux	9fe74e42914c851d68069713b7b917a9c33faf26	Vendor (CNA)
Linux Linux	cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb	Vendor (CNA)
Linux Linux	ecda37f8faab3220da199335e42564cb7a9ad145	Vendor (CNA)
almalinux:bpftool	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-abi-stablelists	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-core	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-cross-headers	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-core	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-devel	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-modules	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-modules-extra	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-devel	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-doc	4.18.0-553.172.1.el8_10 · AlmaLinux:8	Package registry (OSV)
debian:linux	6.1.176-1 · Debian:12	Package registry (OSV)
red hat:bpftool	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:bpftool-debuginfo	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-abi-stablelists	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-core	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-core	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-devel	0:4.18.0-553.172.1.el8_10 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Changed
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/1dd531e28f61edd286edc486ab068f135b5ae1eb

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records