Description
An issue was discovered in the Linux kernel before 5.0.10. SMB2_negotiate in fs/cifs/smb2pdu.c has an out-of-bounds read because data structures are incompletely updated after a change from smb30 to smb21.
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 | 5.2.6-1 | — |
| Debian 13 | linux | 5.2.6-1 | — |
| Debian 12 | linux | 5.2.6-1 | — |
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 | 4.15.0-66.75 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1052.54 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-azure | 5.0.0-1014.14~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp | 5.0.0-1020.20~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1046.49 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.0.0-23.24~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1048.48 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1059.68 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1015.16 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1027.30 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1049.53 | USN-4162-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1066.73 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1052.54~16.04.1 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1061.66 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1047.50 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-66.75~16.04.1 | USN-4162-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1027.30~16.04.1 | USN-4162-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1061.66~14.04.1 | USN-4162-2 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.171-136.231 | 1.0-0.amzn2 | ALAS2-2020-1399 |
| Amazon Linux 2 | perf +8 | 4.14.171-136.231.amzn2 | ALAS2-2020-1399 |
Advisories 3
- USN-4162-2 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- USN-4162-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 9, 2026
- ALAS2-2020-1399 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 6, 2020