NVD / CVE Program· CNA Linux

CVE-2026-46183: mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux a34ca3e33da4b924c66bcca3729bf68ec5936910, cf3b71421ca00807328c6d9cd242f9de3b77a4bf.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux a34ca3e33da4b924c66bcca3729bf68ec5936910, cf3b71421ca00807328c6d9cd242f9de3b77a4bf or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock damon_sysfs_quot_goal->path can be read and written by users, via DAMON sysfs 'path' file. It can also be indirectly read, for the parameters {on,off}line committing to DAMON. The reads for parameters committing are protected by damon_sysfs_lock to avoid the sysfs files being destroyed while any of the parameters are being read. But the user-driven direct reads and writes are not protected by any lock, while the write is deallocating the path-pointing buffer. As a result, the readers could read the already freed buffer (user-after-free). Note that the user-reads don't race when the same open file is used by the writer, due to kernfs's open file locking. Nonetheless, doing the reads and writes with separate open files would be common. Fix it by protecting both the user-direct reads and writes with damon_sysfs_lock.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 28, 2026
Updated: Jun 17, 2026
EPSS: 0.1% · 1th percentile
CWE: CWE-415

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel6.19 and later · before 7.0.7
linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 6.19affected
- c41e253a411eb73a5ac651c14f40c2ea2f274ebd and later · before a34ca3e33da4b924c66bcca3729bf68ec5936910affected · git
- c41e253a411eb73a5ac651c14f40c2ea2f274ebd and later · before cf3b71421ca00807328c6d9cd242f9de3b77a4bfaffected · git
- before 6.19not affected · semver
- 7.0.7 and later · up to and including 7.0.*not affected · semver
- 7.1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:14	linux	before 7.0.7-1	7.0.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
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CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-46179May 28, 2026 · ASoC: SOF: Don't allow pointer operations on unconfigured streams
22Monitor
← EarlierCVE-2026-46182May 28, 2026 · pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace
22Monitor
Later →CVE-2026-46184May 28, 2026 · sound: ua101: fix division by zero at probe
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	a34ca3e33da4b924c66bcca3729bf68ec5936910	Vendor (CNA)
Linux Linux	cf3b71421ca00807328c6d9cd242f9de3b77a4bf	Vendor (CNA)
debian:linux	7.0.7-1 · Debian:14	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-4341420 days apartscsi: qla2xxx: Completely fix fcport double free
39Monitor
CVE-2026-4301127 days apartnet/x25: Fix potential double free of skb
39Monitor
CVE-2026-5299327 days aparttipc: fix double-free in tipc_buf_append()
39Monitor
CVE-2026-3160834 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
39Monitor
CVE-2026-3160934 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
39Monitor
CVE-2026-6388852 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).