CVE-2024-35944

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-35944
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35944.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-35944
Downstream
Related
Published
2024-05-19T11:15:50Z
Modified
2025-07-29T11:12:25.120342Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

VMCI: Fix memcpy() run-time warning in dgdispatchas_host()

Syzkaller hit 'WARNING in dgdispatchas_host' bug.

memcpy: detected field-spanning write (size 56) of single field "&dginfo->msg" at drivers/misc/vmwvmci/vmci_datagram.c:237 (size 24)

WARNING: CPU: 0 PID: 1555 at drivers/misc/vmwvmci/vmcidatagram.c:237 dgdispatchashost+0x88e/0xa60 drivers/misc/vmwvmci/vmci_datagram.c:237

Some code commentry, based on my understanding:

544 #define VMCIDGSIZE(dg) (VMCIDGHEADERSIZE + (sizet)(dg)->payloadsize) /// This is 24 + payload_size

memcpy(&dginfo->msg, dg, dgsize); Destination = dginfo->msg ---> this is a 24 byte structure(struct vmcidatagram) Source = dg --> this is a 24 byte structure (struct vmcidatagram) Size = dgsize = 24 + payload_size

{payloadsize = 56-24 =32} -- Syzkaller managed to set payloadsize to 32.

35 struct delayeddatagraminfo { 36 struct datagramentry *entry; 37 struct workstruct work; 38 bool indghostqueue; 39 /* msg and msgpayload must be together. */ 40 struct vmcidatagram msg; 41 u8 msgpayload[]; 42 };

So those extra bytes of payload are copied into msg_payload[], a run time warning is seen while fuzzing with Syzkaller.

One possible way to fix the warning is to split the memcpy() into two parts -- one -- direct assignment of msg and second taking care of payload.

Gustavo quoted: "Under FORTIFY_SOURCE we should not copy data across multiple members in a structure."

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.216-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1
5.10.84-1
5.10.92-1~bpo10+1
5.10.92-1
5.10.92-2
5.10.103-1~bpo10+1
5.10.103-1
5.10.106-1
5.10.113-1
5.10.120-1~bpo10+1
5.10.120-1
5.10.127-1
5.10.127-2~bpo10+1
5.10.127-2
5.10.136-1
5.10.140-1
5.10.148-1
5.10.149-1
5.10.149-2
5.10.158-1
5.10.158-2
5.10.162-1
5.10.178-1
5.10.178-2
5.10.178-3
5.10.179-1
5.10.179-2
5.10.179-3
5.10.179-4
5.10.179-5
5.10.191-1
5.10.197-1
5.10.205-1
5.10.205-2
5.10.209-1
5.10.209-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.90-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.8.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}