Description
A use-after-free flaw was found in reconn_set_ipaddr_from_hostname in fs/cifs/connect.c in the Linux kernel. The issue occurs when it forgets to set the free pointer server->hostname to NULL, leading to an invalid pointer request.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Kernel | prior to kernel 6.1 rc3 | — |
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 | 6.1.4-1 | — |
| Debian 13 | linux | 6.1.4-1 | — |
| Debian 12 | linux | 6.1.4-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1014.16 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-67.74 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1031.35 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1034.41 | — |
| Ubuntu 22.04 LTS | linux-azure-5.19 | 5.19.0-1022.23~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1034.41.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1030.37 | — |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1028.33 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1016.21 | — |
| Ubuntu 22.04 LTS | linux-hwe-5.19 | 5.19.0-38.39~22.04.1 | USN-5979-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1026.29 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1026.31 | — |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1029.34 | — |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-5.19 | 5.19.0-1021.22~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1023.23 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1030.36 | — |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1025.27 | — |
| Ubuntu 22.04 LTS | linux-riscv +3 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-99.112 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1065.68 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1031.35~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1034.41~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1028.31 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1064.68 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1030.37~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1062.65 | — |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1028.33~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1033.34 | — |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1016.21~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-67.74~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1014.15 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1026.31~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1055.57 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1014.14~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1063.67 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1030.36~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-riscv +24 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1030.34~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1065.68~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1064.68~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-99.112~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1063.67~18.04.1 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1022.27 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1033.36 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1042.48 | — |
| Ubuntu Pro 20.04 LTS | linux-azure | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.0.0-284.11.1.el9_2 | RHSA-2023:2458 |
| RHEL 9 | kernel-rt +14 | 5.14.0-284.11.1.rt14.296.el9_2 | RHSA-2023:2148 |
| RHEL 9 | perf +48 | 5.14.0-284.11.1.el9_2 | RHSA-2023:2458 |
| RHEL 8 | kernel-rt +12 | 4.18.0-477.10.1.rt7.274.el8_8 | RHSA-2023:2736 |
| RHEL 8 | perf +26 | 4.18.0-477.10.1.el8_8 | RHSA-2023:2951 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhev Hypervisor 4 | perf +2 | 4.18.0-372.87.1.el8_6 | RHSA-2024:0412 |
| RHEL 9.0 EUS | kernel-rt +12 | 5.14.0-70.85.1.rt21.156.el9_0 | RHSA-2024:0431 |
| RHEL 9.0 EUS | perf +29 | 5.14.0-70.85.1.el9_0 | RHSA-2024:0432 |
| RHEL 8.6 EUS | perf +26 | 4.18.0-372.87.1.el8_6 | RHSA-2024:0412 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | bpftool | 7.0.0-284.11.1.el9_2 | ALSA-2023:2458 |
| AlmaLinux 9 | kernel-rt +13 | 5.14.0-284.11.1.rt14.296.el9_2 | ALSA-2023:2148 |
| AlmaLinux 9 | perf +45 | 5.14.0-284.11.1.el9_2 | ALSA-2023:2458 |
| AlmaLinux 8 | kernel-rt +11 | 4.18.0-477.10.1.rt7.274.el8_8 | ALSA-2023:2736 |
| AlmaLinux 8 | perf +23 | 4.18.0-477.10.1.el8_8 | ALSA-2023:2951 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.2 | kernel-rt | 5.3.18-150300.121.1 | SUSE-SU-2023:0779-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-150300.121.1 | SUSE-SU-2023:0779-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-150300.121.1 | SUSE-SU-2023:0779-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.112.1-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.0.0-284.11.1.el9_2 | ELSA-2023-2458 |
| Oracle Linux 9 | perf +25 | 5.14.0-284.11.1.el9_2 | ELSA-2023-2458 |
| Oracle Linux 8 | perf +19 | 4.18.0-477.10.1.el8_8 | ELSA-2023-2951 |
Advisories 18
- ALSA-2023:2458 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:2148 Important: kernel-rt security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:2951 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:2736 Important: kernel-rt security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- USN-5979-1 linux-hwe-5.19 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- RHSA-2023:2951 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2023:2458 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:0432 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2024:0431 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2024:0412 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:2736 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:2148 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SUSE-SU-2023:0779-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0064 Juniper Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 10, 2025
- WID-SEC-2023-1250 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 26, 2025
- WID-SEC-2023-2112 IBM Spectrum Protect: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 22, 2023
- ELSA-2023-2951 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 23, 2023
- ELSA-2023-2458 Important: kernel security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 15, 2023