CVE-2023-52849

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Source
https://nvd.nist.gov/vuln/detail/CVE-2023-52849
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52849.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-52849
Related
Published
2024-05-21T16:15:22Z
Modified
2024-09-18T03:24:39.614691Z
Summary
[none]
Details

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

cxl/mem: Fix shutdown order

Ira reports that removing cxlmockmem causes a crash with the following trace:

BUG: kernel NULL pointer dereference, address: 0000000000000044 [..] RIP: 0010:cxlregiondecodereset+0x7f/0x180 [cxlcore] [..] Call Trace: <TASK> cxlregiondetach+0xe8/0x210 [cxlcore] cxldecoderkillregion+0x27/0x40 [cxlcore] cxldunregister+0x29/0x40 [cxlcore] devresreleaseall+0xb8/0x110 deviceunbindcleanup+0xe/0x70 devicereleasedriverinternal+0x1d2/0x210 busremovedevice+0xd7/0x150 devicedel+0x155/0x3e0 deviceunregister+0x13/0x60 devmreleaseaction+0x4d/0x90 ? _pfxunregisterport+0x10/0x10 [cxlcore] deleteendpoint+0x121/0x130 [cxlcore] devresreleaseall+0xb8/0x110 deviceunbindcleanup+0xe/0x70 devicereleasedriverinternal+0x1d2/0x210 busremovedevice+0xd7/0x150 devicedel+0x155/0x3e0 ? lockrelease+0x142/0x290 cdevdevicedel+0x15/0x50 cxlmemdevunregister+0x54/0x70 [cxlcore]

This crash is due to the clearing out the cxl_memdev's driver context (@cxlds) before the subsystem is done with it. This is ultimately due to the region(s), that this memdev is a member, being torn down and expecting to be able to de-reference @cxlds, like here:

static int cxlregiondecodereset(struct cxlregion *cxlr, int count) ... if (cxlds->rcd) goto endpoint_reset; ...

Fix it by keeping the driver context valid until memdev-device unregistration, and subsequently the entire stack of related dependencies, unwinds.

References

Affected packages

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
6.1.64-1

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

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
6.6.8-1

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
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}