Vulnerability Details : CVE-2017-18249
The add_free_nid function in fs/f2fs/node.c in the Linux kernel before 4.12 does not properly track an allocated nid, which allows local users to cause a denial of service (race condition) or possibly have unspecified other impact via concurrent threads.
Vulnerability category: Denial of service
Exploit prediction scoring system (EPSS) score for CVE-2017-18249
Probability of exploitation activity in the next 30 days: 0.04%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 6 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2017-18249
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
4.4
|
MEDIUM | AV:L/AC:M/Au:N/C:P/I:P/A:P |
3.4
|
6.4
|
NIST |
|
7.0
|
HIGH | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.0
|
5.9
|
NIST |
CWE ids for CVE-2017-18249
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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.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-18249
-
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
[SECURITY] [DLA 1715-1] linux-4.9 security updateMailing List;Third Party Advisory
-
http://www.securitytracker.com/id/1041432
Google Android Multiple Flaws Let Remote Users Execute Arbitrary Code and Let Applications Gain Elevated Privileges and Obtain Potentially Sensitive Information - SecurityTrackerThird Party Advisory;VDB Entry
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https://usn.ubuntu.com/3932-1/
USN-3932-1: Linux kernel vulnerabilities | Ubuntu security notices
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https://github.com/torvalds/linux/commit/30a61ddf8117c26ac5b295e1233eaa9629a94ca3
f2fs: fix race condition in between free nid allocator/initializer · torvalds/linux@30a61dd · GitHubPatch;Third Party Advisory
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=30a61ddf8117c26ac5b295e1233eaa9629a94ca3
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Third Party Advisory
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https://usn.ubuntu.com/3932-2/
USN-3932-2: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security notices
Products affected by CVE-2017-18249
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*