CVE-2022-49029 - hwmon: (ibmpex) Fix possible UAF when ibmpex_register_bmc() fails

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HIGH

hwmon: (ibmpex) Fix possible UAF when ibmpex_register_bmc() fails

Published Oct 21, 2024

7.8

HIGH

CVSS 3.1

EPSS 0.24%

Description

Smatch report warning as follows:

drivers/hwmon/ibmpex.c:509 ibmpex_register_bmc() warn: '&data->list' not removed from list

If ibmpex_find_sensors() fails in ibmpex_register_bmc(), data will be freed, but data->list will not be removed from driver_data.bmc_data, then list traversal may cause UAF.

Fix by removeing it from driver_data.bmc_data before free().

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
Vendor Linux Product Linux Default
affected
- Version
  2.6.24
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <2.6.24
- Version
  4.14.301
  Status
  unaffected
  Constraints
  <=4.14.*
- Version
  4.19.268
  Status
  unaffected
  Constraints
  <=4.19.*
- Version
  4.9.335
  Status
  unaffected
  Constraints
  <=4.9.*
- Version
  5.10.158
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.15.82
  Status
  unaffected
  Constraints
  <=5.15.*
- Version
  5.4.226
  Status
  unaffected
  Constraints
  <=5.4.*
- Version
  6.0.12
  Status
  unaffected
  Constraints
  <=6.0.*
- Version
  6.1
  Status
  unaffected
  Constraints
  <=*

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Linux

unaffected

Version	Status	Constraints
	affected
	affected
	affected
	affected
	affected
	affected
	affected
	affected

Linux

affected

Version	Status	Constraints
2.6.24	affected	-
0	unaffected	<2.6.24
4.14.301	unaffected	<=4.14.*
4.19.268	unaffected	<=4.19.*
4.9.335	unaffected	<=4.9.*
5.10.158	unaffected	<=5.10.*
5.15.82	unaffected	<=5.15.*
5.4.226	unaffected	<=5.4.*
6.0.12	unaffected	<=6.0.*
6.1	unaffected	<=*

Red Hat Enterprise Linux 9

kernel-0:5.14.0-570.12.1.el9_6

Fixed · RHSA-2025:6966
Red Hat Enterprise Linux 9

kernel-0:5.14.0-570.12.1.el9_6

Fixed · RHSA-2025:6966
Red Hat Enterprise Linux 6

kernel

Out of support scope
Red Hat Enterprise Linux 7

kernel

Out of support scope
Red Hat Enterprise Linux 7

kernel-rt

Out of support scope
Red Hat Enterprise Linux 8

kernel

Will not fix
Red Hat Enterprise Linux 8

kernel-rt

Will not fix
Red Hat Enterprise Linux 9

kernel-rt

Will not fix

Product	Package	State	Advisory
Red Hat Enterprise Linux 9	kernel-0:5.14.0-570.12.1.el9_6	Fixed	RHSA-2025:6966
Red Hat Enterprise Linux 9	kernel-0:5.14.0-570.12.1.el9_6	Fixed	RHSA-2025:6966
Red Hat Enterprise Linux 6	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel-rt	Out of support scope	n/a
Red Hat Enterprise Linux 8	kernel	Will not fix	n/a
Red Hat Enterprise Linux 8	kernel-rt	Will not fix	n/a
Red Hat Enterprise Linux 9	kernel-rt	Will not fix	n/a

Remediation

Red Hat statement

This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).

Red Hat mitigation

To mitigate this issue, prevent the `ibmpex` kernel module from loading by creating a blacklist file. This action may impact systems that rely on IBM pSeries hardware monitoring. Create a file named `/etc/modprobe.d/blacklist-ibmpex.conf` with the following content: ``` blacklist ibmpex install ibmpex /bin/true ``` After creating the file, regenerate the initramfs and reboot the system for the changes to take effect. For example, on Red Hat Enterprise Linux: ```bash draco-update initramfs reboot ``` Note that a system reboot is required for the mitigation to be fully applied.

Weaknesses (1)

CWE-416

Use After Free

References (14)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2022-49029		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2320693		Issue Tracking
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-53913		Advisory
https://git.kernel.org/stable/c/24b9633f7db7f4809be7053df1d2e117e7c2de10		Patch
https://git.kernel.org/stable/c/45f6e81863747c0d7bc6a95ec51129900e71467a		Patch
https://git.kernel.org/stable/c/798198273bf86673b970b51acdb35e57f42b3fcb		Patch
https://git.kernel.org/stable/c/7b2b67fe1339389e0bf3c37c7a677a004ac0e4e3		Patch
https://git.kernel.org/stable/c/90907cd4d11351ff76c9a447bcb5db0e264c47cd		Patch
https://git.kernel.org/stable/c/e2a87785aab0dac190ac89be6a9ba955e2c634f2		Patch
https://git.kernel.org/stable/c/e65cfd1f9cd27d9c27ee5cb88128a9f79f25d863		Patch
https://git.kernel.org/stable/c/f2a13196ad41c6c2ab058279dffe6c97292e753a		Patch
https://lore.kernel.org/linux-cve-announce/2024102155-CVE-2022-49029-0ffd@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-49029
https://www.cve.org/CVERecord?id=CVE-2022-49029