CVE-2026-46020

HIGH EPSS 2.5%
Published May 27, 20261mo ago · Modified Jun 17, 20261w ago
7.1 CVSS 3.1
High
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: validate damos_quota_goal->nid for node_mem_{used,free}_bp Patch series "mm/damon/core: validate damos_quota_goal->nid". node_mem[cg]_{used,free}_bp DAMOS quota goals receive the node id. The node id is used for si_meminfo_node() and NODE_DATA() without proper validation. As a result, privileged users can trigger an out of bounds memory access using DAMON_SYSFS. Fix the issues. The issue was originally reported [1] with a fix by another author. The original author announced [2] that they will stop working including the fix that was still in the review stage. Hence I'm restarting this. This patch (of 2): Users can set damos_quota_goal->nid with arbitrary value for node_mem_{used,free}_bp. But DAMON core is using those for si_meminfo_node() without the validation of the value. This can result in out of bounds memory access. The issue can actually triggered using DAMON user-space tool (damo), like below. $ sudo ./damo start --damos_action stat \ --damos_quota_goal node_mem_used_bp 50% -1 \ --damos_quota_interval 1s $ sudo dmesg [...] [ 65.565986] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098 Fix this issue by adding the validation of the given node. If an invalid node id is given, it returns 0% for used memory ratio, and 100% for free memory ratio.

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 2

VendorProductVersionRange
linuxlinux_kernel*≥6.16  –  <6.18.27
linuxlinux_kernel*≥6.19  –  <7.0.4

References 3

  • git.kernel.org https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127
    Patch