CVE-2020-8648 json
There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.
published 6y ago modified 4mo ago also EUVD-2020-29496
- cvss
- 7.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.
Patch / fix
- linux Debian 14, Debian 13, Debian 12 5.5.13-1
debian advisories DEBIAN-CVE-2020-8648
- linux Ubuntu 16.04 LTS 4.4.0-178.208
- linux Ubuntu 18.04 LTS 4.15.0-99.100
- linux-aws Ubuntu 16.04 LTS 4.4.0-1106.117
- linux-aws Ubuntu 18.04 LTS 4.15.0-1066.70
- linux-gcp Ubuntu 16.04 LTS 4.15.0-1061.65
- linux-hwe Ubuntu 16.04 LTS 4.15.0-99.100~16.04.1
- linux-hwe Ubuntu 18.04 LTS 5.3.0-51.44~18.04.2
- linux-kvm Ubuntu 16.04 LTS 4.4.0-1070.77
ubuntu advisories UBUNTU-CVE-2020-8648
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel RHEL 8 4.18.0-240.el8
- perf RHEL 8 4.18.0-240.el8
- bpftool RHEL 8 4.18.0-240.el8
- kernel-core RHEL 8 4.18.0-240.el8
- kernel-tools RHEL 8 4.18.0-240.el8
- python3-perf RHEL 8 4.18.0-240.el8
- kernel-modules RHEL 8 4.18.0-240.el8
- kernel-zfcpdump RHEL 8 4.18.0-240.el8
red hat advisories RHSA-2020:4431RHSA-2021:3522RHSA-2021:3320RHSA-2021:2314RHSA-2021:2316RHSA-2020:4609
- kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
- kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
- kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.52.1
- kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
- kernel-obs-build SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
- kernel-syms SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.129.1
- kernel-source SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.4.121-92.129.1
- kernel-default SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.121-92.129.1
suse advisories SUSE-SU-2020:1663-1SUSE-SU-2020:1255-1SUSE-SU-2020:1275-1SUSE-SU-2020:14354-1SUSE-SU-2020:0836-1SUSE-SU-2020:0688-1
- kernel-source openSUSE Tumbleweed 5.14.6-1.4
- kernel-source openSUSE Tumbleweed 6.6.17-1.1
- kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.40.1
- kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.40.1
- kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.40.1
- kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.40.1
- kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.40.1
- kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.40.1
opensuse advisories openSUSE-SU-2024:10728-1openSUSE-SU-2024:13704-1openSUSE-SU-2020:0336-1
Is CVE-2020-8648 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-8648 updated cvss 7.1
kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c
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Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 moreaffected: workaround, no fix planned “Out of support scope”
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Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 moreaffected: workaround, no fix planned “Will not fix”
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Red Hat Enterprise MRG 2 kernelaffected: workaround, no fix planned “Out of support scope”
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Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-240.el8, kernel-debuginfo-common-aarch64 4.18.0-240.el8, kernel-debuginfo-common-ppc64le 4.18.0-240.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-240.el8, kernel 4.18.0-240.el8, bpftool 4.18.0-240.el8, kernel-core 4.18.0-240.el8, kernel-tools 4.18.0-240.el8, python3-perf 4.18.0-240.el8, +15 morefixed: vendor fix RHSA-2020:4431
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Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.31.1.el7, kernel 3.10.0-1160.31.1.el7, bpftool 3.10.0-1160.31.1.el7, python-perf 3.10.0-1160.31.1.el7, kernel-tools 3.10.0-1160.31.1.el7, kernel-tools-libs 3.10.0-1160.31.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.31.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.31.1.el7fixed: vendor fix RHSA-2021:2314
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Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-trace 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.31.1.rt56.1169.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-kvm 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-trace 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-kvm 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-trace-kvm 3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.31.1.rt56.1169.el7fixed: vendor fix RHSA-2021:2316
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Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-240.rt7.54.el8, kernel-rt-core 4.18.0-240.rt7.54.el8, kernel-rt-modules 4.18.0-240.rt7.54.el8, kernel-rt-debug-core 4.18.0-240.rt7.54.el8, kernel-rt-debug-modules 4.18.0-240.rt7.54.el8, kernel-rt-modules-extra 4.18.0-240.rt7.54.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-240.rt7.54.el8, kernel-rt-kvm 4.18.0-240.rt7.54.el8, kernel-rt-core 4.18.0-240.rt7.54.el8, kernel-rt-modules 4.18.0-240.rt7.54.el8, kernel-rt-debug-kvm 4.18.0-240.rt7.54.el8, kernel-rt-debug-core 4.18.0-240.rt7.54.el8, +4 morefixed: vendor fix RHSA-2020:4609
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Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.31.1.el7, kernel 3.10.0-1160.31.1.el7, bpftool 3.10.0-1160.31.1.el7, python-perf 3.10.0-1160.31.1.el7, kernel-kdump 3.10.0-1160.31.1.el7, kernel-tools 3.10.0-1160.31.1.el7, +7 morefixed: vendor fix RHSA-2021:2314
show 14 moreshow fewer
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Red Hat Enterprise Linux Server AUS (v. 7.6) perf 3.10.0-957.80.1.el7, kernel 3.10.0-957.80.1.el7, bpftool 3.10.0-957.80.1.el7, python-perf 3.10.0-957.80.1.el7, kernel-tools 3.10.0-957.80.1.el7, kernel-tools-libs 3.10.0-957.80.1.el7, +2 morefixed: vendor fix RHSA-2021:3320
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Red Hat Enterprise Linux Server AUS (v. 7.7) perf 3.10.0-1062.56.1.el7, kernel 3.10.0-1062.56.1.el7, bpftool 3.10.0-1062.56.1.el7, python-perf 3.10.0-1062.56.1.el7, kernel-tools 3.10.0-1062.56.1.el7, kernel-tools-libs 3.10.0-1062.56.1.el7, +2 morefixed: vendor fix RHSA-2021:3522
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Red Hat Enterprise Linux Server E4S (v. 7.6) perf 3.10.0-957.80.1.el7, kernel 3.10.0-957.80.1.el7, python-perf 3.10.0-957.80.1.el7, kernel-tools 3.10.0-957.80.1.el7, kernel-tools-libs 3.10.0-957.80.1.el7, kernel-bootwrapper 3.10.0-957.80.1.el7, +3 morefixed: vendor fix RHSA-2021:3320
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Red Hat Enterprise Linux Server E4S (v. 7.7) perf 3.10.0-1062.56.1.el7, kernel 3.10.0-1062.56.1.el7, bpftool 3.10.0-1062.56.1.el7, python-perf 3.10.0-1062.56.1.el7, kernel-tools 3.10.0-1062.56.1.el7, kernel-tools-libs 3.10.0-1062.56.1.el7, +4 morefixed: vendor fix RHSA-2021:3522
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Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.31.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.31.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.31.1.el7fixed: vendor fix RHSA-2021:2314
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Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.80.1.el7fixed: vendor fix RHSA-2021:3320
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Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.56.1.el7fixed: vendor fix RHSA-2021:3522
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Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.80.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.80.1.el7fixed: vendor fix RHSA-2021:3320
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Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.56.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.56.1.el7fixed: vendor fix RHSA-2021:3522
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Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.80.1.el7fixed: vendor fix RHSA-2021:3320
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Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.56.1.el7fixed: vendor fix RHSA-2021:3522
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Red Hat Enterprise Linux Server TUS (v. 7.6) perf 3.10.0-957.80.1.el7, kernel 3.10.0-957.80.1.el7, bpftool 3.10.0-957.80.1.el7, python-perf 3.10.0-957.80.1.el7, kernel-tools 3.10.0-957.80.1.el7, kernel-tools-libs 3.10.0-957.80.1.el7, +2 morefixed: vendor fix RHSA-2021:3320
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Red Hat Enterprise Linux Server TUS (v. 7.7) perf 3.10.0-1062.56.1.el7, kernel 3.10.0-1062.56.1.el7, bpftool 3.10.0-1062.56.1.el7, python-perf 3.10.0-1062.56.1.el7, kernel-tools 3.10.0-1062.56.1.el7, kernel-tools-libs 3.10.0-1062.56.1.el7, +2 morefixed: vendor fix RHSA-2021:3522
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Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.31.1.el7, kernel 3.10.0-1160.31.1.el7, bpftool 3.10.0-1160.31.1.el7, python-perf 3.10.0-1160.31.1.el7, kernel-tools 3.10.0-1160.31.1.el7, kernel-tools-libs 3.10.0-1160.31.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.31.1.el7fixed: vendor fix RHSA-2021:2314
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- bugzilla.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=206361 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| NVD | 2.0 | 3.6 | AV:L/AC:L/Au:N/C:P/I:N/A:P |
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
-
bugzilla.kernel.org
/show_bug.cgi?id=206361
exploit, issue-tracking, vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-03/msg00021.html
vendor-advisory, mailing-list, third-party-advisory
-
usn.ubuntu.com
/4344-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4345-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4342-1/
vendor-advisory, third-party-advisory
-
usn.ubuntu.com
/4346-1/
vendor-advisory, third-party-advisory
-
debian.org
/security/2020/dsa-4698
vendor-advisory, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2020/06/msg00011.html
mailing-list, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2020/06/msg00012.html
mailing-list, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2020/06/msg00013.html
mailing-list, third-party-advisory
-
security.netapp.com
/advisory/ntap-20200924-0004/
third-party-advisory
Sources
- CVE List CVE-2020-8648
- NVD CVE-2020-8648
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.