Description
A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | nbdkit | Affects nbdkit v1.12 through v1.26.4 | Fixedin nbdkit v1.26.5 | — |
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 | nbdkit | 1.26.5-1 | — |
| Debian 13 | nbdkit | 1.26.5-1 | — |
| Debian 12 | nbdkit | 1.26.5-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nbdkit | No fix yet | — |
| Ubuntu 26.04 LTS | nbdkit | No fix yet | — |
| Ubuntu 25.10 | nbdkit | No fix yet | — |
| Ubuntu 24.04 LTS | nbdkit | No fix yet | — |
| Ubuntu 22.04 LTS | nbdkit | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nbdkit | No fix yet | — |
| Ubuntu 16.04 LTS | nbdkit | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | SLOF | 20210217-1.module+el8.5.0+10946+35bb3930 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | hivex +6 | 1.3.18-22.module+el8.5.0+12087+2208d04c | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libguestfs-appliance | 1:1.44.0-5.module+el8.6.0+14480+c0a3aa0f | RHSA-2022:1759 |
| RHEL 8 | libguestfs-winsupport | 8.2-2.module+el8.5.0+12739+164806c8 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libiscsi +2 | 1.18.0-8.module+el8.4.0+8855+a9e237a9 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libnbd +6 | 1.6.0-4.module+el8.5.0+11638+3d8f9850 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libtpms +1 | 0.7.4-6.20201106git2452a24dab.module+el8.5.0+12487+f2fa92b4 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libvirt +27 | 7.6.0-6.module+el8.5.0+13051+7ddbe958 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libvirt-dbus | 1.3.0-2.module+el8.4.0+8855+a9e237a9 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | libvirt-python +1 | 7.6.0-1.module+el8.5.0+12098+85b3670b | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | nbdkit +18 | 1.24.0-3.module+el8.5.0+13900+a08c0464 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | netcf +2 | 0.2.8-12.module+el8.4.0+8855+a9e237a9 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | perl-Sys-Virt | 7.4.0-1.module+el8.5.0+11289+b29e262f | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | python-pyvmomi +1 | 6.7.1-7.module+el8.4.0+8855+a9e237a9 | RHSA-2022:0397 |
| RHEL 8 | qemu-img +15 | 15:6.0.0-33.module+el8.5.0+13740+349232b6.2 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | seabios +2 | 1.14.0-1.module+el8.4.0+8855+a9e237a9 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-3.module+el8.4.0+8855+a9e237a9 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | supermin +1 | 5.2.1-1.module+el8.4.0+9751+d56db353 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | swtpm +4 | 0.6.0-2.20210607gitea627b3.module+el8.5.0+12696+4ce1c6bc | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | virt-dib +23 | 1:1.44.0-3.module+el8.5.0+10681+17a9b157 | RHSA-2022:1759, RHSA-2022:0397 |
| RHEL 8 | virt-v2v +3 | 1:1.42.0-16.module+el8.5.0+13900+a08c0464 | RHSA-2022:1759, RHSA-2022:0397 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | SLOF | 20210217-1.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | hivex +6 | 1.3.18-23.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | libguestfs-winsupport | 8.6-1.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | libiscsi +2 | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | libnbd +6 | 1.6.0-5.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | libtpms +1 | 0.9.1-0.20211126git1ff6fe1f43.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | libvirt +27 | 8.0.0-5.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | libvirt-dbus | 1.3.0-2.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | nbdkit +18 | 1.24.0-4.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | netcf +2 | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | perl-Sys-Virt +1 | 8.0.0-1.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | qemu-img +14 | 15:6.2.0-11.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | seabios +2 | 1.15.0-2.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | sgabios +1 | 1:0.20170427git-3.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | supermin +1 | 5.2.1-1.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | swtpm +4 | 0.7.0-1.20211109gitb79fd91.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
| AlmaLinux 8 | virt-dib +24 | 1:1.44.0-5.module_el8.6.0+2880+7d9e3703.alma | ALSA-2022:1759 |
| AlmaLinux 8 | virt-v2v +3 | 1:1.42.0-18.module_el8.6.0+2880+7d9e3703 | ALSA-2022:1759 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | hivex | 1.3.18-23.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | libguestfs | 1:1.44.0-5.module+el8.6.0+1052+ff61d164.rocky | RLSA-2022:1759 |
| Rocky Linux 8 | libguestfs-winsupport | 8.6-1.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | libiscsi | 1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2022:1759 |
| Rocky Linux 8 | libnbd | 1.6.0-5.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | libtpms | 0.9.1-0.20211126git1ff6fe1f43.module+el8.6.0+1052+ff61d164 | RLSA-2022:1759 |
| Rocky Linux 8 | libvirt | 8.0.0-5.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2022:1759 |
| Rocky Linux 8 | nbdkit | 1.24.0-4.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | netcf | 0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2022:1759 |
| Rocky Linux 8 | perl-Sys-Virt +1 | 8.0.0-1.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | qemu-kvm | 5:6.2.0-11.module+el8.6.0+1000+18e3b59f.5 | RLSA-2022:1759 |
| Rocky Linux 8 | seabios | 1.15.0-2.module+el8.6.0+1052+ff61d164 | RLSA-2022:1759 |
| Rocky Linux 8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2022:1759 |
| Rocky Linux 8 | supermin | 5.2.1-1.module+el8.6.0+1052+ff61d164 | RLSA-2022:1759 |
| Rocky Linux 8 | swtpm | 0.7.0-1.20211109gitb79fd91.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
| Rocky Linux 8 | virt-v2v | 1:1.42.0-18.module+el8.6.0+847+b490afdd | RLSA-2022:1759 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nbdkit | 1.27.8-1.2 | openSUSE-SU-2024:11078-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | hivex +6 | 1.3.18-23.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | libguestfs-winsupport | 8.6-1.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-8.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | libnbd +6 | 1.6.0-5.module+el8.6.0+20664+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | libtpms +1 | 0.9.1-0.20211126git1ff6fe1f43.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | libvirt +27 | 8.0.0-5.0.1.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | libvirt-dbus | 1.3.0-2.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | nbdkit +18 | 1.24.0-4.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | netcf +2 | 0.2.8-12.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | perl-Sys-Virt +1 | 8.0.0-1.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | qemu-img +14 | 15:6.2.0-11.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | seabios +2 | 1.15.0-2.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-3.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | supermin +1 | 5.2.1-1.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | swtpm +4 | 0.7.0-1.20211109gitb79fd91.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | virt-dib +24 | 1:1.44.0-5.0.1.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
| Oracle Linux 8 | virt-v2v +3 | 1:1.42.0-18.0.1.module+el8.6.0+20659+3dcf7c70 | ELSA-2022-1759 |
Advisories 6
- ALSA-2022:1759 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 31, 2026
- RHSA-2022:1759 Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 5, 2026
- RHSA-2022:0397 Red Hat Security Advisory: virt:av and virt-devel:av security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RLSA-2022:1759 Moderate: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:11078-1 nbdkit-1.27.8-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2022-1759 Moderate: virt:ol and virt-devel:ol security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 17, 2022
References
- https://www.openwall.com/lists/oss-security/2021/08/18/2
- https://listman.redhat.com/archives/libguestfs/2021-August/msg00083.html
- https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fd
- https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8
- https://bugzilla.redhat.com/show_bug.cgi?id=1994695