RHSA-2026:26573
Vulnerability from csaf_redhat - Published: 2026-06-17 13:24 - Updated: 2026-06-30 04:32Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
util-linux:
* libblkid-2.42.2-1.hum1 (aarch64, x86_64)
* libblkid-devel-2.42.2-1.hum1 (aarch64, x86_64)
* libfdisk-2.42.2-1.hum1 (aarch64, x86_64)
* libfdisk-devel-2.42.2-1.hum1 (aarch64, x86_64)
* liblastlog2-2.42.2-1.hum1 (aarch64, x86_64)
* liblastlog2-devel-2.42.2-1.hum1 (aarch64, x86_64)
* libmount-2.42.2-1.hum1 (aarch64, x86_64)
* libmount-devel-2.42.2-1.hum1 (aarch64, x86_64)
* libsmartcols-2.42.2-1.hum1 (aarch64, x86_64)
* libsmartcols-devel-2.42.2-1.hum1 (aarch64, x86_64)
* libuuid-2.42.2-1.hum1 (aarch64, x86_64)
* libuuid-devel-2.42.2-1.hum1 (aarch64, x86_64)
* python3-libmount-2.42.2-1.hum1 (aarch64, x86_64)
* util-linux-2.42.2-1.hum1 (aarch64, x86_64)
* util-linux-core-2.42.2-1.hum1 (aarch64, x86_64)
* util-linux-i18n-2.42.2-1.hum1 (aarch64, x86_64)
* util-linux-script-2.42.2-1.hum1 (aarch64, x86_64)
* uuidd-2.42.2-1.hum1 (aarch64, x86_64)
* util-linux-2.42.2-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the libblkid library of util-linux. During nested partition probing, the BSD, Minix, Solaris x86, and UnixWare partition probers cache a raw pointer to a parent partition entry in a dynamically allocated array. When subsequent partition additions cause the array to be reallocated, this pointer becomes stale, leading to a heap use-after-free read. An attacker who can present a crafted block device image (for example, via USB insertion or a loop-mounted disk image) can trigger this flaw without user interaction, as libblkid is invoked automatically by udev/udisks as root on block-device hot-plug events. This could lead to limited information disclosure or denial of service.
6.8 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:util-linux-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:util-linux-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:util-linux-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
10 references
Acknowledgments
Calif.io in collaboration with Claude and Anthropic Research
Thai Duong
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"text": "This update includes the following RPMs:\n\nutil-linux:\n * libblkid-2.42.2-1.hum1 (aarch64, x86_64)\n * libblkid-devel-2.42.2-1.hum1 (aarch64, x86_64)\n * libfdisk-2.42.2-1.hum1 (aarch64, x86_64)\n * libfdisk-devel-2.42.2-1.hum1 (aarch64, x86_64)\n * liblastlog2-2.42.2-1.hum1 (aarch64, x86_64)\n * liblastlog2-devel-2.42.2-1.hum1 (aarch64, x86_64)\n * libmount-2.42.2-1.hum1 (aarch64, x86_64)\n * libmount-devel-2.42.2-1.hum1 (aarch64, x86_64)\n * libsmartcols-2.42.2-1.hum1 (aarch64, x86_64)\n * libsmartcols-devel-2.42.2-1.hum1 (aarch64, x86_64)\n * libuuid-2.42.2-1.hum1 (aarch64, x86_64)\n * libuuid-devel-2.42.2-1.hum1 (aarch64, x86_64)\n * python3-libmount-2.42.2-1.hum1 (aarch64, x86_64)\n * util-linux-2.42.2-1.hum1 (aarch64, x86_64)\n * util-linux-core-2.42.2-1.hum1 (aarch64, x86_64)\n * util-linux-i18n-2.42.2-1.hum1 (aarch64, x86_64)\n * util-linux-script-2.42.2-1.hum1 (aarch64, x86_64)\n * uuidd-2.42.2-1.hum1 (aarch64, x86_64)\n * util-linux-2.42.2-1.hum1.src (src)",
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"url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_26573.json"
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"title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
"tracking": {
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"status": "final",
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"product_tree": {
"branches": [
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"branches": [
{
"branches": [
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"category": "product_name",
"name": "Red Hat Hardened Images",
"product": {
"name": "Red Hat Hardened Images",
"product_id": "Red Hat Hardened Images",
"product_identification_helper": {
"cpe": "cpe:/a:redhat:hummingbird:1"
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"category": "product_family",
"name": "Red Hat Hardened Images"
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"name": "util-linux-main@aarch64",
"product": {
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"product_id": "util-linux-main@aarch64",
"product_identification_helper": {
"purl": "pkg:rpm/redhat/libblkid@2.42.2-1.hum1?arch=aarch64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-aarch64-rpms"
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"product_id": "Red Hat Hardened Images:util-linux-main@aarch64"
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"product_reference": "util-linux-main@aarch64",
"relates_to_product_reference": "Red Hat Hardened Images"
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"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"Thai Duong"
],
"organization": "Calif.io in collaboration with Claude and Anthropic Research"
}
],
"cve": "CVE-2026-13595",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2026-05-07T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2494101"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the libblkid library of util-linux. During nested partition probing, the BSD, Minix, Solaris x86, and UnixWare partition probers cache a raw pointer to a parent partition entry in a dynamically allocated array. When subsequent partition additions cause the array to be reallocated, this pointer becomes stale, leading to a heap use-after-free read. An attacker who can present a crafted block device image (for example, via USB insertion or a loop-mounted disk image) can trigger this flaw without user interaction, as libblkid is invoked automatically by udev/udisks as root on block-device hot-plug events. This could lead to limited information disclosure or denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "util-linux: util-linux: heap use-after-free in libblkid nested partition probing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate severity heap use-after-free flaw in libblkid of util-linux could allow an attacker with local access to a system to cause a denial of service or potentially disclose limited information. The vulnerability is triggered when processing a specially crafted block device image, which libblkid automatically handles as root during hot-plug events via udev/udisks. This makes systems susceptible if untrusted block devices can be introduced.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:util-linux-main@aarch64",
"Red Hat Hardened Images:util-linux-main@src",
"Red Hat Hardened Images:util-linux-main@x86_64"
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-13595"
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"category": "external",
"summary": "RHBZ#2494101",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2494101"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-13595",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-13595"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-13595",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13595"
},
{
"category": "external",
"summary": "https://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c",
"url": "https://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c"
}
],
"release_date": "2026-05-07T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-17T13:24:15+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:util-linux-main@aarch64",
"Red Hat Hardened Images:util-linux-main@src",
"Red Hat Hardened Images:util-linux-main@x86_64"
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"restart_required": {
"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:26573"
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{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
"product_ids": [
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"Red Hat Hardened Images:util-linux-main@src",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:util-linux-main@aarch64",
"Red Hat Hardened Images:util-linux-main@src",
"Red Hat Hardened Images:util-linux-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "util-linux: util-linux: heap use-after-free in libblkid nested partition probing"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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