Vulnerability-Lookup

RHSA-2026:99596

Vulnerability from csaf_redhat - Published: 2026-11-12 11:22 - Updated: 2026-11-12 11:38

Summary

Red Hat Security Advisory: gdb security update

Severity

Important

Notes

Topic: An update for gdb is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The GNU Debugger (GDB) allows users to debug programs written in various programming languages including C, C++, and Fortran. Security Fix(es): * gdb: gdb: Out-of-bounds write in STABS parser read_member_functions() via crafted ELF (CVE-2026-13732) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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.

CVE-2026-13732

A flaw was found in GDB's STABS debug format parser. The read_member_functions() function in gdb/stabsread.c contains a linked list removal bug in the code that separates destructor and non-destructor member functions of C++ classes. The bug causes the destructor entries to remain in the main function list while the list length counter is decremented, resulting in an out-of-bounds write when the function list is copied to its final allocated array. An attacker can craft an ELF binary with malicious .stab and .stabstr sections that triggers this out-of-bounds write when a user opens the file in GDB and performs any symbol-inspection operation such as setting a breakpoint. The inferior process does not need to be executed. Under controlled conditions, this was demonstrated to achieve execution of arbitrary commands within the GDB process.

7.0 (High)


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

CWE-787 - Out-of-bounds Write

Affected products

Fixed 27 products

Product	Version	Remediation
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-0:8.2-19.1.el8_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-0:8.2-19.1.el8_8.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-debuginfo-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-debuginfo-0:8.2-19.1.el8_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-debuginfo-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-debugsource-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-debugsource-0:8.2-19.1.el8_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-debugsource-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-doc-0:8.2-19.1.el8_8.noarch	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-gdbserver-0:8.2-19.1.el8_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-gdbserver-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-headless-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-headless-0:8.2-19.1.el8_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:gdb-headless-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-0:8.2-19.1.el8_8.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-debuginfo-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-debuginfo-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-debugsource-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-debugsource-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-doc-0:8.2-19.1.el8_8.noarch	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-gdbserver-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-headless-0:8.2-19.1.el8_8.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:gdb-headless-0:8.2-19.1.el8_8.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:99596	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2494416	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-13732	self
https://bugzilla.redhat.com/show_bug.cgi?id=2494416	external
https://www.cve.org/CVERecord?id=CVE-2026-13732	external
https://nvd.nist.gov/vuln/detail/CVE-2026-13732	external

Acknowledgments

Bhut Red JD Marsters

JSON

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          "organization": "Bhut Red"
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      "cve": "CVE-2026-13732",
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          "text": "A flaw was found in GDB\u0027s STABS debug format parser. The\nread_member_functions() function in gdb/stabsread.c contains a linked\nlist removal bug in the code that separates destructor and non-destructor\nmember functions of C++ classes. The bug causes the destructor entries to\nremain in the main function list while the list length counter is\ndecremented, resulting in an out-of-bounds write when the function list\nis copied to its final allocated array. An attacker can craft an ELF\nbinary with malicious .stab and .stabstr sections that triggers this\nout-of-bounds write when a user opens the file in GDB and performs any\nsymbol-inspection operation such as setting a breakpoint. The inferior\nprocess does not need to be executed. Under controlled conditions, this\nwas demonstrated to achieve execution of arbitrary commands within the\nGDB process.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "gdb: gdb: Out-of-bounds write in STABS parser read_member_functions() via crafted ELF",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw affects the STABS debug format parser in GDB, which is present\nand active in all currently supported Red Hat product streams that ship\nGDB. The STABS format is a legacy debug information format predating DWARF\nthat GDB parses automatically from .stab/.stabstr ELF sections. While GCC\nremoved STABS emitting support in GCC 13 and GDB deprecated STABS parsing\nin GDB 17, all deployed GDB versions parse STABS data without user opt-in.\nAn attacker can embed STABS sections in any ELF binary, including one\ncompiled with DWARF debug information, and GDB will parse both. The\nvulnerability requires the user to open the crafted binary in GDB and\nissue a symbol-inspection command, which is normal GDB usage.",
          "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"
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          "details": "The following practices would help for avoiding exposure and mitigate this\nflaw:\n- Do not open untrusted or unknown ELF binaries in GDB without first\n  stripping debug sections. Use `objcopy --remove-section=.stab\n  --remove-section=.stabstr \u003cbinary\u003e` before debugging.\n- Use `readelf -S \u003cbinary\u003e | grep stab` to check for the presence of\n  STABS sections before opening a binary in GDB. Legitimate modern\n  binaries use DWARF, not STABS.\n- Consider using LLDB or other debuggers that do not support STABS for\n  analysis of untrusted binaries.\n- For automated environments (CI, test farms) that invoke GDB on\n  potentially untrusted binaries, run GDB in a sandboxed or containerized\n  environment with restricted filesystem access.\n- GDB 17+ deprecates STABS support but still parses it. GDB 18 (expected\n  late 2026/2027) will remove STABS support entirely.\n- GCC removed STABS emitting in GCC 13 (2023), so legitimately compiled\n  binaries from recent GCC versions will not contain STABS data.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "gdb: gdb: Out-of-bounds write in STABS parser read_member_functions() via crafted ELF"
    }
  ]
}

CVE-2026-13732 (GCVE-0-2026-13732)

Vulnerability from cvelistv5 – Published: 2026-08-31 19:23 – Updated: 2026-11-12 11:38

Title

Gdb: gdb: out-of-bounds write in stabs parser read_member_functions() via crafted elf

Summary

Severity

7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 14:33 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1188 records in the last 180 days details

References

15 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:73425	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:73426	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:73427	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:79357	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:82447	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:82939	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:96095	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:96096	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:96097	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:96098	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:99594	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:99596	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:99597	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-13732	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2494416	issue-trackingx_refsource_REDHAT

Impacted products

21 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:16.3-3.1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:14.2-4.3.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:8.2-20.1.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	Unaffected: 0:8.2-15.1.el8_4 , < * (rpm) cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	Unaffected: 0:8.2-15.1.el8_4 , < * (rpm) cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	Unaffected: 0:8.2-18.1.el8_6 , < * (rpm) cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	Unaffected: 0:8.2-18.1.el8_6 , < * (rpm) cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	Unaffected: 0:8.2-19.1.el8_8 , < * (rpm) cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	Unaffected: 0:8.2-19.1.el8_8 , < * (rpm) cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:16.3-3.1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Unaffected: 0:10.2-10.2.el9_2 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:10.2-13.1.el9_4 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4::appstream
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:14.2-4.2.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat	Red Hat Cost Management On-Premise 1	Unaffected: 1791460851 , < * (rpm) cpe:/a:redhat:cost_management_on_premise:1::el10
Red Hat	Red Hat Hardened Images	Unaffected: 17.2-6.2.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1791978534 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1791978528 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1791964013 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Update Infrastructure 5	Unaffected: 1791978693 , < * (rpm) cpe:/a:redhat:rhui:5::el9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:rhel_els:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:rhel_els:7

Date Public

2026-08-06 00:00

Credits

Red Hat would like to thank JD Marsters (Bhut Red) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

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