CVE-2024-41085

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-41085
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-41085.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-41085
Downstream
Published
2024-07-29T15:48:01Z
Modified
2025-10-15T12:38:14.152169Z
Summary
cxl/mem: Fix no cxl_nvd during pmem region auto-assembling
Details

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

cxl/mem: Fix no cxl_nvd during pmem region auto-assembling

When CXL subsystem is auto-assembling a pmem region during cxl endpoint port probing, always hit below calltrace.

BUG: kernel NULL pointer dereference, address: 0000000000000078 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page RIP: 0010:cxlpmemregionprobe+0x22e/0x360 [cxlpmem] Call Trace: <TASK> ? die+0x24/0x70 ? pagefaultoops+0x82/0x160 ? douseraddrfault+0x65/0x6b0 ? excpagefault+0x7d/0x170 ? asmexcpagefault+0x26/0x30 ? cxlpmemregionprobe+0x22e/0x360 [cxlpmem] ? cxlpmemregionprobe+0x1ac/0x360 [cxlpmem] cxlbusprobe+0x1b/0x60 [cxlcore] reallyprobe+0x173/0x410 ? _pfxdeviceattachdriver+0x10/0x10 _driverprobedevice+0x80/0x170 driverprobedevice+0x1e/0x90 _deviceattachdriver+0x90/0x120 busforeachdrv+0x84/0xe0 _deviceattach+0xbc/0x1f0 busprobedevice+0x90/0xa0 deviceadd+0x51c/0x710 devmcxladdpmemregion+0x1b5/0x380 [cxlcore] cxlbusprobe+0x1b/0x60 [cxl_core]

The cxlnvd of the memdev needs to be available during the pmem region probe. Currently the cxlnvd is registered after the endpoint port probe. The endpoint probe, in the case of autoassembly of regions, can cause a pmem region probe requiring the not yet available cxl_nvd. Adjust the sequence so this dependency is met.

This requires adding a port parameter to cxlfindnvdimm_bridge() that can be used to query the ancestor root port. The endpoint port is not yet available, but will share a common ancestor with its parent, so start the query from there instead.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f17b558d6663101f876a1d9cbbad3de0c8f4ce4d
Fixed
1d064e4fbebcf5b18dc10c1f3973487eb163b600
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f17b558d6663101f876a1d9cbbad3de0c8f4ce4d
Fixed
84ec985944ef34a34a1605b93ce401aa8737af96

Affected versions

v6.*

v6.1
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
v6.9.1
v6.9.2
v6.9.3
v6.9.4
v6.9.5
v6.9.6
v6.9.7

Database specific 

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}

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.9.8