Vulnerability-Lookup

SUSE-SU-2026:22453-1

Vulnerability from csaf_suse - Published: 2026-06-30 09:42 - Updated: 2026-06-30 09:42

Summary

Security update for glibc

Severity

Moderate

Notes

Title of the patch: Security update for glibc

Description of the patch: This update for glibc fixes the following issues - CVE-2026-5435: unchecked buffer writing in TSIG handling can lead to an out-of-bounds write (bsc#1263656). - CVE-2026-6238: insufficient RDATA length validation can lead to application crashes or uninitialized memory disclosure (bsc#1263658).

Patchnames: SUSE-SLE-Micro-6.1-601

CVE-2026-5435

5.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected products

Recommended 16 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix

Threats

Impact moderate

CVE-2026-6238

5.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected products

Recommended 16 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-devel-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:glibc-locale-base-2.38-slfo.1.1_9.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

12 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1263656	self
https://bugzilla.suse.com/1263658	self
https://www.suse.com/security/cve/CVE-2026-5435/	self
https://www.suse.com/security/cve/CVE-2026-6238/	self
https://www.suse.com/security/cve/CVE-2026-5435	external
https://bugzilla.suse.com/1263656	external
https://www.suse.com/security/cve/CVE-2026-6238	external
https://bugzilla.suse.com/1263658	external

JSON

To clipboard

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CVE-2026-5435 (GCVE-0-2026-5435)

Vulnerability from cvelistv5 – Published: 2026-04-28 11:58 – Updated: 2026-04-28 15:21

Title

Potential buffer overflow in ns_sprintrrf TSIG handling path

Summary

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-787 - Out-of-bounds write

Assigner

glibc

References

2 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=34033	issue-tracking
https://inbox.sourceware.org/libc-announce/7a655d…	mailing-list

Impacted products

1 product

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.2 , ≤ * (custom)

Date Public

2026-04-02 02:11

Credits

shinobu

Show details on NVD website

JSON

To clipboard

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CVE-2026-6238 (GCVE-0-2026-6238)

Vulnerability from cvelistv5 – Published: 2026-04-28 16:43 – Updated: 2026-06-19 20:40

Title

Buffer overread in ns_printrrf with corrupted RDATA field

Summary

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory. These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-126 - Buffer over-read

Assigner

glibc

References

2 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=34069
https://inbox.sourceware.org/libc-announce/7a655d…

Impacted products

1 product

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.0.1 , ≤ 2.43 (custom)

Show details on NVD website

JSON

To clipboard

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              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-6238",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-28T18:51:21.285963Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-28T18:51:25.367Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "glibc",
          "vendor": "The GNU C Library",
          "versions": [
            {
              "lessThanOrEqual": "2.43",
              "status": "affected",
              "version": "2.0.1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThe deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory.\u003c/p\u003e\u003cdiv\u003eThese functions are for application debugging only and hence not in the path of code executed by the DNS resolver.  Further, they have been deprecated since version 2.34 and should not be used by any new applications.  Applications should consider porting away from these interfaces since they may be removed in future versions.\u003c/div\u003e"
            }
          ],
          "value": "The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory.\n\nThese functions are for application debugging only and hence not in the path of code executed by the DNS resolver.  Further, they have been deprecated since version 2.34 and should not be used by any new applications.  Applications should consider porting away from these interfaces since they may be removed in future versions."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-598",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-598 DNS Spoofing"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-126",
              "description": "CWE-126 Buffer over-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T20:40:00.060Z",
        "orgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
        "shortName": "glibc"
      },
      "references": [
        {
          "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=34069"
        },
        {
          "url": "https://inbox.sourceware.org/libc-announce/7a655d55-276f-41fe-b550-feb3ebb2ce91@redhat.com/T/#u"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Buffer overread in ns_printrrf with corrupted RDATA field",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
    "assignerShortName": "glibc",
    "cveId": "CVE-2026-6238",
    "datePublished": "2026-04-28T16:43:08.526Z",
    "dateReserved": "2026-04-13T16:56:08.986Z",
    "dateUpdated": "2026-06-19T20:40:00.060Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

SUSE-SU-2026:22453-1

CVE-2026-5435 (GCVE-0-2026-5435)

CVE-2026-6238 (GCVE-0-2026-6238)

Tags

Sightings

Nomenclature