Linux Kernel up to 7.1.4 perf fsl_emb_pmu_del race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been rated as very critical. The impacted element is the function fsl_emb_pmu_del of the component perf. The manipulation leads to race condition. This vulnerability is uniquely identified as CVE-2026-80626. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been rated as very critical. This issue affects the function fsl_emb_pmu_del of the component perf. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del fsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at the 'out:' label, but only calls the matching get_cpu_var() after the 'i < 0' early-return check. When event->hw.idx is negative the function jumps to 'out:' without having taken get_cpu_var(), and the trailing put_cpu_var() then issues an unmatched preempt_enable(), underflowing preempt_count. On a CONFIG_PREEMPT=y kernel preempt_count would underflow and eventually present as a 'scheduling while atomic' BUG. Move put_cpu_var() to pair with get_cpu_var() so the percpu access is correctly bracketed and the 'out:' label only handles perf_pmu_enable.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-80626 since 08/26/2026. The exploitation is known to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/28/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40 or 7.1.5 eliminates this vulnerability. Applying the patch c0c7722308c5f303117d8bd555290fdf26b098da/67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28/9a515e00b00132b6fc3f1dd62dc5204bbda8cb10/5397142d60aa29dcf636f5459d960bfc4f97c42a/b89477077c834d94381c7bf07d81193bebefcff9/73711688479df333acc134e3730fff1acba1843e/b504fd953664c3f4d176ae8cb594adb3fda9d577/81e3a86030462824a67d697739cf3f387f4ba350 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: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5
Patch: c0c7722308c5f303117d8bd555290fdf26b098da/67aeb1eb93d4ffd898a3e74a7f3fe46ee71feb28/9a515e00b00132b6fc3f1dd62dc5204bbda8cb10/5397142d60aa29dcf636f5459d960bfc4f97c42a/b89477077c834d94381c7bf07d81193bebefcff9/73711688479df333acc134e3730fff1acba1843e/b504fd953664c3f4d176ae8cb594adb3fda9d577/81e3a86030462824a67d697739cf3f387f4ba350

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-2026-80626 (🔒)
GCVE (CVE): GCVE-0-2026-80626
GCVE (VulDB): GCVE-100-396557

Entryinfo

Created: 08/28/2026 10:16
Changes: 08/28/2026 10:16 (59)
Complete: 🔍
Cache ID: 216::103

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