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NVD / CVE Program· CNA Linux

CVE-2026-80671: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON

Noroxi assessment

Priority: Monitor (action score 37/100)

  • 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: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2003918e13f43cf6c5698be3cc9aa3657dd676a8, 22263d241bad753217d545f8085b7ead52e2873b, 261d2b5f4afa0570ca906e553c93811c5abe4590.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2003918e13f43cf6c5698be3cc9aa3657dd676a8, 22263d241bad753217d545f8085b7ead52e2873b, 261d2b5f4afa0570ca906e553c93811c5abe4590 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: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON register_pid() has several issues when processing untrusted perf.data: 1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap to a small value on 32-bit systems when pid is large (e.g. 0x40000000), causing realloc to return a tiny buffer followed by out-of-bounds writes in the initialization loop. 2. Heap buffer overflow: strcpy(task->comm, comm) copies the untrusted comm string into a fixed 20-byte COMM_LEN buffer with no length check. 3. BUG_ON on allocation failure: perf.data is untrusted input, so allocation failures should be handled gracefully rather than killing the process. 4. Realloc of sched->tasks assigned directly back, leaking the old pointer on failure; nr_tasks incremented before the realloc, leaving corrupted state on failure. Cap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum on 64-bit), replace strcpy with strlcpy, guard against NULL comm, replace BUG_ON with NULL returns using safe realloc patterns, and add NULL checks in callers that dereference the result.

CriticalCVSS 9.3 · v3.1—No exploit Fix available
Published
Aug 28, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 4th percentile
CWE
—

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
9.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2026-80671

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

—

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

    • 2.6.32affected
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 344e59fc4f2cba6dc04ce5e2a77388645d4ca834affected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 22263d241bad753217d545f8085b7ead52e2873baffected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 2003918e13f43cf6c5698be3cc9aa3657dd676a8affected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 29639f00bfa49da7904ba0a499e0da7a0e5d735eaffected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 261d2b5f4afa0570ca906e553c93811c5abe4590affected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 652cea73b7b7b7c622a2be670e44e3c499c6d49faffected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 5ea1dcc9418c4e06ce29ed5170596f497ba86872affected · git
    • ec156764d424dd67283c2cd5e9f6f1b8388364ac and later · before 5949d339f5ec98752d56dcd4e36f619a59d513a5affected · git
    • before 2.6.32not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80669Aug 28, 2026 · bpf: Disable xfrm_decode_session hook attachment
    0Monitor
  • ← EarlierCVE-2026-80670Aug 28, 2026 · perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
    36Monitor
  • Later →CVE-2026-80672Aug 28, 2026 · ntfs: fix u16 truncation of restart-area length check
    35Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Linux Linux2003918e13f43cf6c5698be3cc9aa3657dd676a8Vendor (CNA)
Linux Linux22263d241bad753217d545f8085b7ead52e2873bVendor (CNA)
Linux Linux261d2b5f4afa0570ca906e553c93811c5abe4590Vendor (CNA)
Linux Linux29639f00bfa49da7904ba0a499e0da7a0e5d735eVendor (CNA)
Linux Linux344e59fc4f2cba6dc04ce5e2a77388645d4ca834Vendor (CNA)
Linux Linux5949d339f5ec98752d56dcd4e36f619a59d513a5Vendor (CNA)
Linux Linux5ea1dcc9418c4e06ce29ed5170596f497ba86872Vendor (CNA)
Linux Linux652cea73b7b7b7c622a2be670e44e3c499c6d49fVendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

No nightly-computed relations.

Chain candidates

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

—

Bug bounty scope

No known public program.

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

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records