Swtpm: swtpm: out-of-bounds read in swtpm_nvram_checkheader due to sizeof(pointer) vs sizeof(struct) mismatch
CVE-2026-75900 is fixed in swtpm on 1 platform, first by DEBIAN-CVE-2026-75900, released August 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| swtpm · Debian 14 | 0.10.2-1 | DEBIAN-CVE-2026-75900 | Aug 29, 2026 |
| swtpm · opensuse-leap 16.0 | 0.10.2-160000.1.1 | OPENSUSE-SU-2026:22048-1 | Oct 7, 2026 |
| swtpm · sles 15.7 | 0.9.0-150700.3.3.1 | SUSE-SU-2026:4366-1 | Sep 28, 2026 |
| swtpm · sles 16.0 | 0.10.2-160000.1.1 | SUSE-SU-2026:24156-1 | Oct 7, 2026 |
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