CVE-2016-9806: linux linux_kernel Race Condition
Vulnerability summary
CVE-2016-9806 is a high (CVSS 7.8) Race Condition vulnerability in linux linux_kernel. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 21 · Related 18Timeline
- 28-12-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
Race condition in the netlink_dump function in net/netlink/af_netlink.c in the Linux kernel before 4.6.3 allows local users to cause a denial of service (double free) or possibly have unspecified other impact via a crafted application that makes sendmsg system calls, leading to a free operation associated with a new dump that started earlier than anticipated.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.37%
Chance of exploitation in the next 30 days
Percentile
29%
Versus all other CVEs
30-day change
0.00 pp
From 0.36% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')The product contains a concurrent code sequence that 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 operating concurrently.
- CWE-415Double FreeThe product calls free() twice on the same memory address.
Affected systems
Ubuntu5 products
- linux< 3.13.0-107.154 | < 4.4.0-34.53
- linux-lts-vivid< 3.19.0-79.87~14.04.1
- linux-lts-xenial< 4.4.0-34.53~14.04.1
- linux-raspi2< 4.4.0-1019.25
- linux-snapdragon< 4.4.0-1022.25
Suse2 products
- kgraft-patch-SLE12_Update_18&distro=SUSE Linux Enterprise Server 12-LTSS< 2-2.1
- kgraft-patch-SLE12_Update_18&distro=SUSE Linux Enterprise Server for SAP Applications 12< 2-2.1
Debian1 product
- linux< 4.6.3-1
Linux1 product
- linux_kernel≥ 3.12, < 3.12.62 | ≥ 3.13, < 3.14.73 | ≥ 3.15, < 3.16.37 | ≥ 3.17, < 3.18.37 | ≥ 3.19, < 4.1.28 | ≥ 4.2, < 4.4.14 | ≥ 4.5, < 4.6.3
4 vendors · 9 products
References
20 links- www.openwall.com/lists/oss-security/2016/12/03/4Mailing ListX Refsource MLISTPatchThird Party Advisory
- github.com/torvalds/linux/commit/92964c79b357efd980812c4de5c1fd2ec8bb5520X Refsource CONFIRMPatchThird Party Advisory
