7.5

CVE-2015-6831: debian debian_linux Use After Free

Modified
AliasesUBUNTU-CVE-2015-6831
Published 19-01-2016Last modified 06-08-2024

Vulnerability summary

CVE-2015-6831 is a high (CVSS 7.5) Use After Free vulnerability in debian debian_linux. EPSS estimates a 7.06% chance of exploitation in the next 30 days, higher than 94.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.3 (NVD); no exploitation reported by the 5 checked sources; EPSS 7% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v2.0 (NVD)
EPSS score
7.06%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 4
DLA-341-1DSA-3344-1RHSA-2016:0457SUSE-SU-2015:1633-1SUSE-SU-2015:1818-1SUSE-SU-2016:1638-1

Timeline

  1. 19-01-2016
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.

CVSS metrics

4 scores · 2 sources · 3 versions

EPSS trend

Probability

7.06%

Chance of exploitation in the next 30 days

Percentile

94%

Versus all other CVEs

30-day change

No change 0.00 pp

From 7.06% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
Php1 product
  • php< 5.4.44 | ≥ 5.5.0, < 5.5.28 | ≥ 5.6.0, < 5.6.12
Ubuntu1 product
  • php5< 5.5.9+dfsg-1ubuntu4.13

3 vendors · 3 products

References

12 links
Show all 12 references