Use-after-free vulnerability in the path_openat function in fs/namei.c in the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a denial of service or possibly have unspecified other impact via O_TMPFILE filesystem operations that leverage a duplicate cleanup operation.
CVE-2015-5706
MEDIUMCVSS v2 · 4.64.6—
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 4.6 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:L/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 0.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.
Sources: epss, nvd_v2
4.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS v2: 4.6Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 4.6MEDIUMNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 4.6MEDIUMlow confidence
- EG Risk
- 25EG Risk 25/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity46% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.4%
- EPSS %ILE
- 35th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
August 31, 2015
Last Modified
May 6, 2026
References (22)
- cve@mitrehttp://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f15133df088ecadd141ea1907f2c96df67c729f0
- cve@mitrehttp://twitter.com/grsecurity/statuses/597127122910490624
- cve@mitrehttp://www.debian.org/security/2015/dsa-3329
- cve@mitrehttp://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.4
- cve@mitrehttp://www.openwall.com/lists/oss-security/2015/08/01/5
- cve@mitrehttp://www.securityfocus.com/bid/76142
- cve@mitrehttp://www.ubuntu.com/usn/USN-2680-1
- cve@mitrehttp://www.ubuntu.com/usn/USN-2681-1
- cve@mitrehttps://bugzilla.redhat.com/show_bug.cgi?id=1250047
- cve@mitrehttps://github.com/torvalds/linux/commit/f15133df088ecadd141ea1907f2c96df67c729f0
- cve@mitrehttps://source.android.com/security/bulletin/2017-01-01.html
- af854a3a-2127-422b-91ae-364da2661108http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f15133df088ecadd141ea1907f2c96df67c729f0
- af854a3a-2127-422b-91ae-364da2661108http://twitter.com/grsecurity/statuses/597127122910490624
- af854a3a-2127-422b-91ae-364da2661108http://www.debian.org/security/2015/dsa-3329
- af854a3a-2127-422b-91ae-364da2661108http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.4
Related CVEs(same vendor)
Same vendor
10 shownubuntu:USN-2664-1 · ubuntu:USN-2680-1
Frequently asked(4)
What is CVE-2015-5706?
CVE-2015-5706 is a medium vulnerability published on August 31, 2015. Use-after-free vulnerability in the pathopenat function in fs/namei.c in the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a denial of service or possibly have unspecified other impact via OTMPFILE filesystem operations that leverage a duplicate cleanup operation.
When was CVE-2015-5706 disclosed?
CVE-2015-5706 was first published on August 31, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-5706 actively exploited?
CVE-2015-5706 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
How do I remediate CVE-2015-5706?
A fix for CVE-2015-5706 is available: update to the fixed version the vendor names in its advisory.
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