Google: sys-kernel/lakitu-kernel-6_1: security update to 18244.1.7

medium Tenable Cloud Security Plugin ID 450535

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- In the Linux kernel, the following vulnerability has been resolved: mm/sparsemem: fix race in accessing
memory_section->usage The below race is observed on a PFN which falls into the device memory region with
the system memory configuration where PFN's are such that [ZONE_NORMAL ZONE_DEVICE ZONE_NORMAL]. Since
normal zone start and end pfn contains the device memory PFN's as well, the compaction triggered will try
on the device memory PFN's too though they end up in NOP(because pfn_to_online_page() returns NULL for
ZONE_DEVICE memory sections). When from other core, the section mappings are being removed for the
ZONE_DEVICE region, that the PFN in question belongs to, on which compaction is currently being operated
is resulting into the kernel crash with CONFIG_SPASEMEM_VMEMAP enabled. The crash logs can be seen at [1].
compact_zone() memunmap_pages ------------- --------------- __pageblock_pfn_to_page ...... (a)pfn_valid():
valid_section()//return true (b)__remove_pages()-> sparse_remove_section()-> section_deactivate(): [Free
the array ms->usage and set ms->usage = NULL] pfn_section_valid() [Access ms->usage which is NULL] NOTE:
From the above it can be said that the race is reduced to between the pfn_valid()/pfn_section_valid() and
the section deactivate with SPASEMEM_VMEMAP enabled. The commit b943f045a9af("mm/sparse: fix kernel crash
with pfn_section_valid check") tried to address the same problem by clearing the SECTION_HAS_MEM_MAP with
the expectation of valid_section() returns false thus ms->usage is not accessed. Fix this issue by the
below steps: a) Clear SECTION_HAS_MEM_MAP before freeing the ->usage. b) RCU protected read side critical
section will either return NULL when SECTION_HAS_MEM_MAP is cleared or can successfully access ->usage. c)
Free the ->usage with kfree_rcu() and set ms->usage = NULL. No attempt will be made to access ->usage
after this as the SECTION_HAS_MEM_MAP is cleared thus valid_section() return false. Thanks to David/Pavan
for their inputs on this patch. [1] https://lore.kernel.org/linux-
mm/[email protected]/ On Snapdragon SoC, with the mentioned memory
configuration of PFN's as [ZONE_NORMAL ZONE_DEVICE ZONE_NORMAL], we are able to see bunch of issues daily
while testing on a device farm. For this particular issue below is the log. Though the below log is not
directly pointing to the pfn_section_valid(){ ms->usage;}, when we loaded this dump on T32 lauterbach
tool, it is pointing. [ 540.578056] Unable to handle kernel NULL pointer dereference at virtual address
0000000000000000 [ 540.578068] Mem abort info: [ 540.578070] ESR = 0x0000000096000005 [ 540.578073] EC =
0x25: DABT (current EL), IL = 32 bits [ 540.578077] SET = 0, FnV = 0 [ 540.578080] EA = 0, S1PTW = 0 [
540.578082] FSC = 0x05: level 1 translation fault [ 540.578085] Data abort info: [ 540.578086] ISV = 0,
ISS = 0x00000005 [ 540.578088] CM = 0, WnR = 0 [ 540.579431] pstate: 82400005 (Nzcv daif +PAN -UAO +TCO
-DIT -SSBSBTYPE=--) [ 540.579436] pc : __pageblock_pfn_to_page+0x6c/0x14c [ 540.579454] lr :
compact_zone+0x994/0x1058 [ 540.579460] sp : ffffffc03579b510 [ 540.579463] x29: ffffffc03579b510 x28:
0000000000235800 x27:000000000000000c [ 540.579470] x26: 0000000000235c00 x25: 0000000000000068
x24:ffffffc03579b640 [ 540.579477] x23: 0000000000000001 x22: ffffffc03579b660 x21:0000000000000000 [
540.579483] x20: 0000000000235bff x19: ffffffdebf7e3940 x18:ffffffdebf66d140 [ 540.579489] x17:
00000000739ba063 x16: 00000000739ba063 x15:00000000009f4bff [ 540.579495] x14: 0000008000000000 x13:
0000000000000000 x12:0000000000000001 [ 540.579501] x11: 0000000000000000 x10: 0000000000000000 x9
:ffffff897d2cd440 [ 540.579507] x8 : 0000000000000000 x7 : 0000000000000000 x6 :ffffffc03579b5b4 [
540.579512] x5 : 0000000000027f25 x4 : ffffffc03579b5b8 x3 :0000000000000 ---truncated--- (CVE-2023-52489)

Solution

Update the sys-kernel/lakitu-kernel-6_1 library and its related packages to version 18244.1.7 or later.

Plugin Details

Severity: Medium

ID: 450535

Version: Revision 1.1

Type: Local

Family: Google COS Security Checks

Published: 10/1/2026

Updated: 10/1/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 97

Vendor

Vendor Severity: MEDIUM

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 3

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2023-52489

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.2

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 2/19/2024

Reference Information

CVE: CVE-2023-52489

Detections

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