Linux Kernel up to 6.18.39/7.1.4 damon mm/damon/core.c damon_verify_new_region @ar/node_start_addr/node_end_addr input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.66

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.18.39/7.1.4. This affects the function damon_verify_new_region of the file mm/damon/core.c of the component damon. Such manipulation of the argument @ar/node_start_addr/node_end_addr leads to input validation. This vulnerability is referenced as CVE-2026-80592. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.39/7.1.4. It has been rated as critical. Affected by this issue is the function damon_verify_new_region of the file mm/damon/core.c of the component damon. The manipulation of the argument @ar/node_start_addr/node_end_addr with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: samples/damon/mtier: fail early if address range parameters are invalid The comment on top of `struct damon_region` clearly says that For any use case, @ar should be non-zero positive size. which is now verified in damon_verify_new_region() if the kernel is built with DAMON_DEBUG_SANITY. The WARN_ONCE() can be triggered if the mtier sample module is enabled before node{0,1}_{start,end}_addr have been properly initialized, which is obviously not good. ------------[ cut here ]------------ start 0 >= end 0 WARNING: mm/damon/core.c:217 at damon_new_region+0xf4/0x118, CPU#59: bash/341468 Call trace: damon_new_region+0xf4/0x118 (P) damon_set_regions+0xfc/0x3c0 damon_sample_mtier_build_ctx+0xe8/0x3a8 damon_sample_mtier_start+0x1c/0x90 damon_sample_mtier_enable_store+0x98/0xb0 param_attr_store+0xb4/0x128 module_attr_store+0x2c/0x50 sysfs_kf_write+0x58/0x90 kernfs_fop_write_iter+0x16c/0x238 vfs_write+0x2c0/0x370 ksys_write+0x74/0x118 __arm64_sys_write+0x24/0x38 invoke_syscall+0xa8/0x118 el0_svc_common.constprop.0+0x48/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x54/0x370 el0t_64_sync_handler+0xa0/0xe8 el0t_64_sync+0x1ac/0x1b0 ---[ end trace 0000000000000000 ]--- Note that the same issue can happen if detect_node_addresses is true, and node 0 or 1 is memoryless. Fix it together by checking the validity of parameters right before damon_new_region() and fail early if they're invalid.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-80592 since 08/26/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/28/2026).

Upgrading to version 6.18.40 or 7.1.5 eliminates this vulnerability. Applying the patch 9d360fb820a3b9576d155e720ec44fef54d2efb5/db20589d7b248211f63f4a7f642a49c0832b13ae/7746d72c64054976887928d64d2caf25c5a6dcc0 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: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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 6.18.40/7.1.5
Patch: 9d360fb820a3b9576d155e720ec44fef54d2efb5/db20589d7b248211f63f4a7f642a49c0832b13ae/7746d72c64054976887928d64d2caf25c5a6dcc0

Timelineinfo

08/26/2026 CVE reserved
08/28/2026 +2 days Advisory disclosed
08/28/2026 +0 days VulDB entry created
08/28/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80592 (🔒)
GCVE (CVE): GCVE-0-2026-80592
GCVE (VulDB): GCVE-100-396530

Entryinfo

Created: 08/28/2026 09:57
Changes: 08/28/2026 09:57 (61)
Complete: 🔍
Cache ID: 216::103

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