Unknown

CVE-2026-68175 — tracing: Fix resource leak on mmiotrace trace_pipe close

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix resource leak on mmiotrace trace_pipe close The mmiotrace tracer was added May 12th 2008. At that time, resources created in pipe_open() could not be freed because there was not pipe_close function pointer of the tracer. The pipe_close function pointer was added in December 7th, 2009, but the mmiotrace tracer was not updated. mmio_pipe_open() allocates a header_iter and takes a pci_dev reference when trace_pipe is opened. mmio_close() frees them, but it was only wired to the tracer's .close callback. tracing_release_pipe() invokes .pipe_close, not .close, when the trace_pipe file is released. As a result, closing trace_pipe with the mmiotrace tracer active leaked the header_iter allocation and left a stale pci_dev reference. Set .pipe_close to mmio_close, matching how function_graph wires both callbacks to the same handler. Note, if the trace_pipe is read to completion, it will clean up the resources, but if one were to run: # head -n 1 /sys/kernel/tracing/trace_pipe VERSION 20070824 Over and over again, it would trigger a massive leak.

Published Aug 10, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.21%

ahead of 11% of scored CVEs · Oct 30, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < 7871128ea41217fa6a58bbbcb44cb0d2e9e60966≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < 1d0b59e2b203c02149d8f63607329debe36b3ec5≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < 581ac13e12e77d6c64f8719083bdf95209308919≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < f9e6dfe341fb31c95b9655eb6b1db8b3ae090817≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < 594e1cf3f736779a535873fd5988162d827bfe4f≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < cf5a82bef623b969a609f2b7e392d06dbae34aa6≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < cb459fec4f7b13caf646101ff076e94ef38434d8≥ c521efd1700a8c0f7ce26f011f5eaecca17fabfa and < c1d87e724ae55e781b7cc7ccafb34d9e668582b2 and 1 more version 2.6.33	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 30, 2026 · 15 reading(s) · max 0.21%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 10, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/7871128ea41217fa6a58bbbcb44cb0d2e9e60966
NIST National Vulnerability Database
git.kernel.org/stable/c/f9e6dfe341fb31c95b9655eb6b1db8b3ae090817
NIST National Vulnerability Database
git.kernel.org/stable/c/1d0b59e2b203c02149d8f63607329debe36b3ec5
NIST National Vulnerability Database
git.kernel.org/stable/c/581ac13e12e77d6c64f8719083bdf95209308919
NIST National Vulnerability Database
git.kernel.org/stable/c/c1d87e724ae55e781b7cc7ccafb34d9e668582b2
NIST National Vulnerability Database
git.kernel.org/stable/c/cf5a82bef623b969a609f2b7e392d06dbae34aa6
NIST National Vulnerability Database
git.kernel.org/stable/c/cb459fec4f7b13caf646101ff076e94ef38434d8
NIST National Vulnerability Database
git.kernel.org/stable/c/594e1cf3f736779a535873fd5988162d827bfe4f
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 3d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 3d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 3d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 3d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 3d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-68175 is "tracing: Fix resource leak on mmiotrace trace_pipe close", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.21% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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