Description
In the Linux kernel, the following vulnerability has been resolved:
can: j1939: fix Use-after-Free, hold skb ref while in use
This patch fixes a Use-after-Free found by the syzbot.
The problem is that a skb is taken from the per-session skb queue,
without incrementing the ref count. This leads to a Use-after-Free if
the skb is taken concurrently from the session queue due to a CTS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.4 | 5.4.128 |
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 | 5.10.46-1 | — |
| Debian 13 | linux | 5.10.46-1 | — |
| Debian 12 | linux | 5.10.46-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +22 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-81.91 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1055.58 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1056.58 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1019.22 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1051.55 | — |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1022.23 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1045.47 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1053.57 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1042.46 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1055.58~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1056.58~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1051.55~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-81.91~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1053.57~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1042.46~18.04.3 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1032.37 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |