CVE-2018-16884: canonical ubuntu_linux Use After Free
Vulnerability summary
CVE-2018-16884 is a high (CVSS 8.0) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 1.46% chance of exploitation in the next 30 days, higher than 73.5% of scored vulnerabilities.
Not severe (CVSS 6.5, adjacent network); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 28 · Related 15Timeline
- 18-12-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.
CVSS metrics
7 scores · 4 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated8.0HighCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.0HighCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST6.5MediumCVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H
- OSV · UbuntuEcosystem advisory · calculated8.0HighCVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
1.46%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.46% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: adjacent network, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Suse49 products
- kernel-livepatch-SLE15_Update_0&distro=SUSE Linux Enterprise Live Patching 15< 8-22.2
- kernel-livepatch-SLE15_Update_1&distro=SUSE Linux Enterprise Live Patching 15< 7-2.1
- kernel-livepatch-SLE15_Update_2&distro=SUSE Linux Enterprise Live Patching 15< 7-2.1
- kernel-livepatch-SLE15_Update_3&distro=SUSE Linux Enterprise Live Patching 15< 5-2.1
- kernel-livepatch-SLE15_Update_4&distro=SUSE Linux Enterprise Live Patching 15< 4-2.1
Ubuntu25 products
- linuxAll versions (No fix recorded) | < 4.4.0-145.171 | < 4.15.0-50.54
- linux-aws< 4.4.0-1040.43 | < 4.4.0-1079.89 | < 4.15.0-1039.41
- linux-aws-hwe< 4.15.0-1039.41~16.04.1
- linux-azure< 4.15.0-1045.49~14.04.1 | < 4.15.0-1045.49 | < 4.18.0-1018.18~18.04.1
- linux-azure-6.11All versions (No fix recorded)
Debian2 products
- linux< 4.19.16-1
- debian_linuxEOL8.0
Redhat2 products
- enterprise_linuxEOL7.0
- enterprise_mrg2.0
[unknown]1 product
- kernel:n/a
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04
Linux1 product
- linux_kernel≥ 3.7, < 3.16.65 | ≥ 3.17, < 3.18.133 | ≥ 3.19, < 4.4.171 | ≥ 4.5, < 4.9.151 | ≥ 4.10, < 4.14.94 | ≥ 4.15, < 4.19.16 | ≥ 4.20, < 4.20.3
7 vendors · 81 products
References
38 links
lists.debian.org/debian-lts-announce/2019/03/msg00034.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2019/04/msg00004.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.debian.org/debian-lts-announce/2019/05/msg00002.htmlMailing ListX Refsource MLISTThird Party Advisory
Show all 38 references
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884X Refsource CONFIRMIssue TrackingPatchThird Party Advisory