Description
An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel through 4.18.11. It does not ensure that only root may inspect the kernel stack of an arbitrary task, allowing a local attacker to exploit racy stack unwinding and leak kernel task stack contents.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.18.20-1 | — |
| Debian 13 | linux | 4.18.20-1 | — |
| Debian 12 | linux | 4.18.20-1 | — |
| Debian 8 | linux | 3.16.64-1 | DLA-1731-1 |
| Debian 8 | linux-4.9 | 4.9.144-3.1~deb8u1 | DLA-1715-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-44.47 | USN-3871-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1032.34 | USN-3871-3 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1037.39 | USN-3871-5 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1027.28 | USN-3871-3 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1029.29 | USN-3871-3 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1033.38 | USN-3871-3 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1031.33 | USN-3871-3 |
| Ubuntu 16.04 LTS | linux | 4.4.0-139.165 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1072.82 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1032.34~16.04.1 | USN-3871-4 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1037.39~16.04.1 | USN-3871-5 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1027.28~16.04.1 | USN-3871-4 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-45.48~16.04.1 | USN-3871-4 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1037.43 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1100.108 | USN-3821-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1104.109 | USN-3821-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-165.215 | USN-3880-1 |
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1034.37 | USN-3821-2 |
| Ubuntu 14.04 LTS | linux-azure | 4.15.0-1037.39~14.04.2 | USN-3871-5 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-139.165~14.04.1 | USN-3821-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1008.10 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-alt | 4.14.0-115.7.1.el7a | RHSA-2019:0831 |
| RHEL 7 | kernel-rt +10 | 3.10.0-957.10.1.rt56.921.el7 | RHSA-2019:0514 |
| RHEL 7 | perf +19 | 3.10.0-957.10.1.el7 | RHSA-2019:0831, RHSA-2019:0512 |
| RHEL 6 | perf +15 | 2.6.32-754.18.2.el6 | RHSA-2019:2473 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-azure +2 | 4.4.180-4.31.1 | SUSE-SU-2019:1527-1 |
| SLES 12 SP3 | kernel-docs +4 | 4.4.180-94.97.1 | SUSE-SU-2019:1532-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.114.1 | SUSE-SU-2019:1534-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_30 | 1-3.5.1 | SUSE-SU-2019:1534-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.115.1 | SUSE-SU-2019:1533-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_34 | 1-2.5.1 | SUSE-SU-2019:1533-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.61-52.154.1 | SUSE-SU-2019:1692-1, SUSE-SU-2019:1533-1 |
| SLES 12 | kgraft-patch-SLE12_Update_40 | 1-1.5.1 | SUSE-SU-2019:1692-1 |
| SLES 11 SP4 | kernel-ec2 +6 | 3.0.101-108.95.2 | SUSE-SU-2019:14089-1 |
| SLES 11 SP4 | kernel-syms +1 | 3.0.101-108.95.1 | SUSE-SU-2019:14089-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | kernel-azure +2 | 4.4.180-4.31.1 | SUSE-SU-2019:1527-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.97.1 | SUSE-SU-2019:1532-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.114.1 | SUSE-SU-2019:1534-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_30 | 1-3.5.1 | SUSE-SU-2019:1534-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.115.1 | SUSE-SU-2019:1533-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_34 | 1-2.5.1 | SUSE-SU-2019:1533-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_26 | 1-4.3.3 | SUSE-SU-2019:1532-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.114.1 | SUSE-SU-2019:1534-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_30 | 1-3.5.1 | SUSE-SU-2019:1534-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.114.1 | SUSE-SU-2019:1534-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_30 | 1-3.5.1 | SUSE-SU-2019:1534-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | perf +8 | 4.14.77-80.57.amzn2 | ALAS2-2018-1100 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.30.1.el6uek | 0.4.5-3.el6 | ELSA-2019-4532 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.30.1.el7uek | 0.4.5-3.el7 | ELSA-2019-4532 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.30.1.el7uek | ELSA-2019-4541, ELSA-2019-4532, ELSA-2019-4531 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-1844.2.5.el7uek | ELSA-2019-4541 |
| Oracle Linux 7 | perf +12 | 3.10.0-957.10.1.el7 | ELSA-2019-4541, ELSA-2019-0512 |
Advisories 24
- RHSA-2019:2473 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:0831 Red Hat Security Advisory: kernel-alt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:0512 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:0514 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3821-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3821-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3871-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3880-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1731-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1715-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3871-5 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3871-3 linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3871-4 linux-hwe, linux-aws-hwe, linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2019:1534-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14089-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1532-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1527-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1692-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1533-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2018-1100 Moderate: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 8, 2025
- ELSA-2019-0512 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 13, 2019
- ELSA-2019-4541 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 12, 2019
- ELSA-2019-4531 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 6, 2019
- ELSA-2019-4532 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 6, 2019
References
- USN-3821-1 vendor-advisory
- USN-3835-1 vendor-advisory
- RHSA-2019:0512 vendor-advisory
- USN-3880-1 vendor-advisory
- USN-3871-5 vendor-advisory
- USN-3871-4 vendor-advisory
- 105525 vdb-entry
- USN-3880-2 vendor-advisory
- USN-3832-1 vendor-advisory
- USN-3821-2 vendor-advisory
- https://marc.info/?l=linux-fsdevel&m=153806242024956&w=2
- USN-3871-1 vendor-advisory
- RHSA-2019:0514 vendor-advisory
- USN-3871-3 vendor-advisory
- [debian-lts-announce] 20190315 [SECURITY] [DLA 1715-1] linux-4.9 security update mailing-list
- [debian-lts-announce] 20190327 [SECURITY] [DLA 1731-1] linux security update mailing-list
- [debian-lts-announce] 20190401 [SECURITY] [DLA 1731-2] linux regression update mailing-list
- RHSA-2019:0831 vendor-advisory
- openSUSE-SU-2019:1407 vendor-advisory
- RHSA-2019:2473 vendor-advisory
- https://support.f5.com/csp/article/K27673650?utm_source=f5support&%3Butm_medium=RSS