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CVE-2015-6526

15
FAUCET Score

CVE-2015-6526 describes a denial-of-service vulnerability in the Linux kernel, specifically affecting ppc64 platforms running versions prior to 4.0.2. A local attacker can trigger an infinite loop by providing a deep 64-bit userspace backtrace to the perf_callchain_user_64 function. This vulnerability has a CVSS score of 4.9, indicating a low severity with local access and low attack complexity leading to a complete availability impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.0.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.9MEDIUM

AV:L/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 58th percentile among its peer group of 3,052 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-327.el7
View patch

Vendor Advisories (1)

redhatCVE-2015-6526Moderate

kernel: perf on ppc64 can loop forever getting userlevel stacktraces

Apr 13, 2015

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
bugzilla.redhat.com / show_bug.cgi
github.com / torvalds/linux/commit/9a5cbce421a283e6aea3c4007f141735bf9da8c3
kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.0.2
openwall.com / lists/oss-security/2015/08/18/4
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/76401
securitytracker.com / id/1033728
ubuntu.com / usn/USN-2759-1
ubuntu.com / usn/USN-2760-1