Description
An out-of-bounds read vulnerability was found in swtpm's SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
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 | swtpm | 0.10.2-1 | — |
| Debian 13 | swtpm | No fix yet | — |
| Debian 12 | swtpm | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | swtpm | No fix yet | — |
| Ubuntu 26.04 LTS | swtpm | No fix yet | — |
| Ubuntu 24.04 LTS | swtpm | No fix yet | — |
| Ubuntu 22.04 LTS | swtpm | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | swtpm | 0.9.0-150700.3.3.1 | SUSE-SU-2026:4366-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | swtpm | 0.10.2-160000.1.1 | SUSE-SU-2026:24156-1 |
| SLES 16.0 | swtpm | 0.10.2-160000.1.1 | SUSE-SU-2026:24156-1 |
| SLE Micro 6.2 | swtpm | 0.10.2-160000.1.1 | SUSE-SU-2026:24114-1 |
| SLE Micro 6.1 | swtpm | 0.9.0-slfo.1.1_3.1 | SUSE-SU-2026:23927-1 |
| SLE Micro 6.0 | swtpm | 0.8.0-2.1 | SUSE-SU-2026:23879-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | swtpm | 0.10.2-1.1 | openSUSE-SU-2026:11598-1 |
| openSUSE Leap 16.0 | swtpm | 0.10.2-160000.1.1 | openSUSE-SU-2026:22048-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | swtpm | 0.10.2 | — |
| Alpine v3.23 | swtpm | 0.10.2 | — |
| Alpine v3.22 | swtpm | 0.10.2 | — |
| Alpine v3.21 | swtpm | 0.10.2 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | swtpm | 0.8.1-6 | — |
Advisories 7
- openSUSE-SU-2026:22048-1 Security update for swtpm SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:24156-1 Security update for swtpm SUSE / openSUSE Security Updates · Oct 16, 2026
- SUSE-SU-2026:24114-1 Security update for swtpm SUSE / openSUSE Security Updates · Oct 10, 2026
- SUSE-SU-2026:23927-1 Security update for swtpm SUSE / openSUSE Security Updates · Sep 30, 2026
- SUSE-SU-2026:4366-1 Security update for swtpm SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23879-1 Security update for swtpm SUSE / openSUSE Security Updates · Sep 28, 2026
- openSUSE-SU-2026:11598-1 swtpm-0.10.2-1.1 on GA media SUSE / openSUSE Security Updates · Aug 26, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-75900 vdb-entry
- RHBZ#2517910 issue-tracking