OPENSUSE-SU-2026:21879-1

Vulnerability from csaf_opensuse - Published: 2026-09-18 07:48 - Updated: 2026-09-24 17:48
Summary
Security update for google-guest-agent
Severity
Important
Notes
Title of the patch: Security update for google-guest-agent
Description of the patch: This update for google-guest-agent fixes the following issues: - CVE-2026-56852: golang.org/x/text/unicode/norm: infinite loop on truncated/invalid UTF-8 input (bsc#1272118). - CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and deadlocks in the crypto/ssh library (bsc#1278597). - CVE-2026-84303: google.golang.org/grpc: xDS RBAC HTTP filter implementation issue allows for bypass of authorization policies via mixed-case or canonical-case header matches (bsc#1279297). - CVE-2026-84304: google.golang.org/grpc: heap memory exhaustion via HTTP/2 DATA frame fragmentation (bsc#1279414). - CVE-2026-84445: google.golang.org/grpc: DoS via crash due to missing ':authority' and 'Host' headers in gRPC-Go xDS servers (bsc#1278967). Changes for google-guest-agent: - Update to version 20260903.01 * Update dependencies to latest (#636) * fix octal digit comparison in morePermissive (#631) * Remove KillMode from google-guest-agent-manager (#629) * Fix SUSE Linux Micro 6+ (#628) + Fix oslogin for Micro 6+ * Exclude irrelevant tests on FreeBSD (#625) * Replace abandoned serial dependency (#624) * Add build rules for MWLID extension * Support basic account management on FreeBSD (#619) * fix dependency between sshd and google-guest-agent-manager.service (#621) * Update go.mod dependencies (#622) * Fallback to shebang execution when running scripts (#618) * Update go dependencies (#620) * Make guest-agent buildable on FreeBSD (#617)
Patchnames: openSUSE-Leap-16.0-1706
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-56852
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: openSUSE Leap 16.0:google-guest-agent-0:20260903.01-160000.1.1.aarch64 —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:google-guest-agent-0:20260903.01-160000.1.1.ppc64le —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:google-guest-agent-0:20260903.01-160000.1.1.s390x —
Vendor Fix
Unresolved product id: openSUSE Leap 16.0:google-guest-agent-0:20260903.01-160000.1.1.x86_64 —
Vendor Fix
Threats
Impact moderate
CVE-2026-56854
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-56852
Threats
Impact important
CVE-2026-56855
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 4 products, the same list as for CVE-2026-56852
Threats
Impact important
CVE-2026-78662
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-56852
Threats
Impact important
CVE-2026-84303
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-56852
Threats
Impact critical
CVE-2026-84304
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 4 products, the same list as for CVE-2026-56852
Threats
Impact important
CVE-2026-84445
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 4 products, the same list as for CVE-2026-56852
Threats
Impact important
References
URL Category
https://www.suse.com/support/security/rating/ external
https://ftp.suse.com/pub/projects/security/csaf/o… self
https://bugzilla.suse.com/1253357 self
https://bugzilla.suse.com/1272118 self
https://bugzilla.suse.com/1278597 self
https://bugzilla.suse.com/1278967 self
https://bugzilla.suse.com/1279297 self
https://bugzilla.suse.com/1279414 self
https://www.suse.com/security/cve/CVE-2026-56852/ self
https://www.suse.com/security/cve/CVE-2026-56854/ self
https://www.suse.com/security/cve/CVE-2026-56855/ self
https://www.suse.com/security/cve/CVE-2026-78662/ self
https://www.suse.com/security/cve/CVE-2026-84303/ self
https://www.suse.com/security/cve/CVE-2026-84304/ self
https://www.suse.com/security/cve/CVE-2026-84445/ self
https://www.suse.com/security/cve/CVE-2026-56852 external
https://bugzilla.suse.com/1271661 external
https://bugzilla.suse.com/1280553 external
https://www.suse.com/security/cve/CVE-2026-56854 external
https://bugzilla.suse.com/1278446 external
https://bugzilla.suse.com/1280553 external
https://www.suse.com/security/cve/CVE-2026-56855 external
https://bugzilla.suse.com/1278446 external
https://bugzilla.suse.com/1280553 external
https://www.suse.com/security/cve/CVE-2026-78662 external
https://bugzilla.suse.com/1278446 external
https://bugzilla.suse.com/1280553 external
https://www.suse.com/security/cve/CVE-2026-84303 external
https://bugzilla.suse.com/1278268 external
https://bugzilla.suse.com/1280553 external
https://www.suse.com/security/cve/CVE-2026-84304 external
https://bugzilla.suse.com/1278271 external
https://bugzilla.suse.com/1280553 external
https://www.suse.com/security/cve/CVE-2026-84445 external
https://bugzilla.suse.com/1278687 external
https://bugzilla.suse.com/1280553 external
https://bugzilla.suse.com/1280617 external
To clipboard 

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          "text": "Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.",
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          "text": "Previously, a channel registered in the mux\u0027s chanList is not usable until it is established. A malicious peer was able flood the channel\u0027s incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.",
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}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.