CVE-2026-31459 | mm/damon/sysfs: fix param_ctx leak on damon_sysfs_new_test_ctx() failure

In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix param_ctx leak on damon_sysfs_new_test_ctx() failure Patch series "mm/damon/sysfs: fix memory leak and NULL dereference issues", v4. DAMON_SYSFS can leak memory under allocation failure, and do NULL pointer dereference when a privileged user make wrong sequences of control. Fix those. This patch (of 3): When damon_sysfs_new_test_ctx() fails in damon_sysfs_commit_input(), param_ctx is leaked because the early return skips the cleanup at the out label. Destroy param_ctx before returning.

Published: 2026-04-22 Last update: 2026-05-06 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-31459 is rated Low Risk (23.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-31459

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-23 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-31459

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2026-31459

GitHub Security Advisory for CVE-2026-31459

GHSA-6c8g-q98p-w229 · Severity: medium — In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix...

OS Trackers for CVE-2026-31459

vendor priority summary link
debian unimportant CVE-2026-31459 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-31459
redhat — — https://access.redhat.com/security/cve/CVE-2026-31459
suse medium CVE-2026-31459 severity moderate: SUSE including 26 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 224 product×package rows across 40 product lines (SUSE Linux Enterprise High Availability Extension 15 SP7, SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, … (40 product lines)): Known Not Affected 224. https://www.suse.com/security/cve/CVE-2026-31459/
ubuntu medium CVE-2026-31459 medium priority: Ubuntu including 161 source packages (linux, linux-allwinner-5.19, …), 1449 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1048, ignored 169, not-affected 126, released 83, needed 19, needs-triage 4. https://ubuntu.com/security/CVE-2026-31459

Affected software / configurations for CVE-2026-31459

Vendor Product Version Raw CPE
linux linux_kernel >= 6.18.1, < 6.18.21 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.19, < 6.19.11 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel 6.17.6 cpe:2.3:o:linux:linux_kernel:6.17.6:*:*:*:*:*:*:*
linux linux_kernel 6.18 cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*
linux linux_kernel 6.18 cpe:2.3:o:linux:linux_kernel:6.18:rc3:*:*:*:*:*:*
linux linux_kernel 6.18 cpe:2.3:o:linux:linux_kernel:6.18:rc4:*:*:*:*:*:*
linux linux_kernel 6.18 cpe:2.3:o:linux:linux_kernel:6.18:rc5:*:*:*:*:*:*
linux linux_kernel 6.18 cpe:2.3:o:linux:linux_kernel:6.18:rc6:*:*:*:*:*:*
linux linux_kernel 6.18 cpe:2.3:o:linux:linux_kernel:6.18:rc7:*:*:*:*:*:*
linux linux_kernel 7.0 cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
linux linux_kernel 7.0 cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
linux linux_kernel 7.0 cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
linux linux_kernel 7.0 cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
linux linux_kernel 7.0 cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*

References for CVE-2026-31459

cvelogic Threat Intelligence