Skip to content
Fencer Vulns
medium 6.1

CVE-2026-75900 json

Swtpm: swtpm: out-of-bounds read in swtpm_nvram_checkheader due to sizeof(pointer) vs sizeof(struct) mismatch

published 2026-08-19 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-62363

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • swtpm Debian 14 0.10.2-1

debian advisories DEBIAN-CVE-2026-75900

  • swtpm SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 0.10.2-160000.1.1
  • swtpm SLE Module for Server Applications 15 SP7 0.9.0-150700.3.3.1
  • swtpm Linux Micro 6.0 0.8.0-2.1
  • swtpm Linux Micro 6.1 0.9.0-slfo.1.1_3.1

suse advisories SUSE-SU-2026:24114-1SUSE-SU-2026:24156-1SUSE-SU-2026:4366-1SUSE-SU-2026:23879-1SUSE-SU-2026:23927-1

  • swtpm openSUSE Leap 16.0 0.10.2-160000.1.1
  • swtpm openSUSE Tumbleweed 0.10.2-1.1

opensuse advisories openSUSE-SU-2026:22048-1openSUSE-SU-2026:11598-1

  • swtpm Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 0.10.2

alpine advisories ALPINE-CVE-2026-75900

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • swtpm Azure Linux 3.0 0.8.1-6

azure linux advisories AZL-96876

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-75900 updated cvss 6.1

swtpm: swtpm: Out-of-bounds read in SWTPM_NVRAM_CheckHeader due to sizeof(pointer) vs sizeof(struct) mismatch

  • Red Hat Enterprise Linux 8 swtpm, swtpm-libs, swtpm-tools, swtpm-tools-pkcs11 Red Hat Enterprise Linux 9 swtpm, swtpm-libs, swtpm-tools Red Hat Enterprise Linux 10 swtpm
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.