Description
The Linux kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140 has a use-after-free because skcd->no_refcnt was not considered during a backport of a CVE-2020-14356 patch. This is related to the cgroups feature.
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 9 | linux | 4.9.240-1 | DLA-2420-1 |
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 +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-118.119 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1083.87 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1096.106 | — |
| Ubuntu 18.04 LTS | linux-gcp +9 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1084.95 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1070.73 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1075.76 | — |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1097.107 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1054.58 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1071.75 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1087.95 | — |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1083.87~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1096.106~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1084.95~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-118.119~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1054.58~16.04.1 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2027.27 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2009.10 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1041.46 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1096.106~14.04.1 | — |
Advisories 2
- DLA-2420-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2022-2387 Google Android Patchday Dezember 2020 BSI CERT-Bund (WID) · May 30, 2023
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1868453
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=82fd2138a5ffd7e0d4320cdb669e115ee976a26e
- https://www.spinics.net/lists/stable/msg405099.html
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.233
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.194
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.140
- https://security.netapp.com/advisory/ntap-20201001-0004/
- [debian-lts-announce] 20201030 [SECURITY] [DLA 2420-1] linux security update mailing-list
- [debian-lts-announce] 20201031 [SECURITY] [DLA 2420-2] linux regression update mailing-list