Linux Kernel up to 6.18.44/7.1.8 DAMON mtier samples/damon/mtier.c damos_quota_score node0_mem_used_bp/node0_mem_free_bp divide by zero

CVSS Meta Temp Score
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CTI Interest Score
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4.0$0-$5k2.58-

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.44/7.1.8. It has been classified as problematic. This affects the function damos_quota_score of the file samples/damon/mtier.c of the component DAMON mtier. Performing a manipulation of the argument node0_mem_used_bp/node0_mem_free_bp results in divide by zero. This vulnerability was named CVE-2026-74643. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.44/7.1.8. It has been classified as problematic. This affects the function damos_quota_score of the file samples/damon/mtier.c of the component DAMON mtier. The manipulation of the argument node0_mem_used_bp/node0_mem_free_bp with an unknown input leads to a divide by zero vulnerability. CWE is classifying the issue as CWE-369. The product divides a value by zero. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: samples/damon/mtier: error out for zero quota goal target values Patch series "mm/damon: avoid division by zero from damos_quota_score()". DAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division by zero in damos_quota_score(). Avoid it by adding parameters validation checks. This patch (of 2): damos_quota_score() can trigger division by zero if the target_value is zero. DAMON_SAMPLE_MTIER lets users set the target_value via node0_mem_{used,free}_bp parameters. It doesn't guard zero value case, though. As a result, users can trigger division by zero. Fix the issue by returning an error when the user tries to start DAMON with zero node0_mem_{used,free}_bp parameter values. DAMON_SAMPLE_MTIER is just a sample module, but the consequence is quite bad. Also the zero node0_mem_free_bp parameter might look like a reasonable setup to some users. Hence, the issue might really happen in the real world. One reliable way to reproduce the issue is like below: # cd /sys/module/damon_sample_mtier/parameters # echo 4096 > node0_start_addr # echo 8192 > node0_end_addr # echo 8192 > node1_start_addr # echo 81920 > node1_end_addr # echo 0 > node0_mem_free_bp # echo Y > enabled # dmesg -w [...] [18792.235916] Oops: divide error: 0000 [#1] SMP NOPTI [...] [18792.242787] RIP: 0010:damos_quota_score+0x6f/0x480 [...] This issue was discovered [1] by Sashiko.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-74643 since 08/15/2026. The exploitability is told to be easy. An attack has to be approached locally. Additional levels of successful authentication are necessary for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch e16b8d640ec99b28bc827560edcf9706e610c3aa/684f271210becd7b8c4088f06c442499e48a43a0/a16fd3ad9d89b05475864da97327870464611736 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.45/7.1.9
Patch: e16b8d640ec99b28bc827560edcf9706e610c3aa/684f271210becd7b8c4088f06c442499e48a43a0/a16fd3ad9d89b05475864da97327870464611736

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/22/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74643 (🔒)
GCVE (CVE): GCVE-0-2026-74643
GCVE (VulDB): GCVE-100-394413

Entryinfo

Created: 08/22/2026 18:27
Changes: 08/22/2026 18:27 (61)
Complete: 🔍
Cache ID: 216::103

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