Vulnerability-Lookup

OESA-2026-4154 (CVE-2026-86805)

Vulnerability from osv_openeuler – Published: 2026-09-30 13:47 – Updated: 2026-09-30 13:47 – Source website

Summary

glibc security update

Details

The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt, login, exit and more.

Security Fix(es):

Exploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by ".." traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.(CVE-2026-86805)

When such a program's DT_RPATH or DT_RUNPATH begins with $ORIGIN and is followed by NUL or '/' the loader both reads past the end of the path buffer and writes past the end of a stack-allocated internal buffer. The corrupted loader stack can lead to a loader crash (denial of service) and limited disclosure of process memory.(CVE-2026-95818)

Severity

6.3 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-86805	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-95818	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "glibc-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-all-langpacks-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-common-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-debuginfo-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-debugsource-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-debugutils-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-devel-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-locale-archive-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-locale-source-2.38-128.oe2403sp3.aarch64.rpm",
          "glibc-nss-devel-2.38-128.oe2403sp3.aarch64.rpm",
          "libnsl-2.38-128.oe2403sp3.aarch64.rpm",
          "nscd-2.38-128.oe2403sp3.aarch64.rpm",
          "nss_modules-2.38-128.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.38-128.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "glibc-2.38-128.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "glibc-2.38-128.oe2403sp3.x86_64.rpm",
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          "glibc-debugutils-2.38-128.oe2403sp3.x86_64.rpm",
          "glibc-devel-2.38-128.oe2403sp3.x86_64.rpm",
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          "nss_modules-2.38-128.oe2403sp3.x86_64.rpm"
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      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "glibc",
        "purl": "pkg:rpm/openEuler/glibc\u0026distro=openEuler-24.03-LTS-SP3"
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      "ranges": [
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            {
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  "details": "The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt,  login, exit and more.\r\n\r\nSecurity Fix(es):\n\nA time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared object and execute arbitrary code with the elevated privileges of the program.\n\nExploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by \u0026quot;..\u0026quot; traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.(CVE-2026-86805)\n\nA stack-based buffer overflow in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to crash or corrupt the memory of setuid/setgid (AT_SECURE) programs.\n\nWhen such a program\u0026apos;s DT_RPATH or DT_RUNPATH begins with $ORIGIN and is followed by NUL or \u0026apos;/\u0026apos; the loader both reads past the end of the path buffer and writes past the end of a stack-allocated internal buffer. The corrupted loader stack can lead to a loader crash (denial of service) and limited disclosure of process memory.(CVE-2026-95818)",
  "id": "OESA-2026-4154",
  "modified": "2026-09-30T13:47:07Z",
  "published": "2026-09-30T13:47:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4154"
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      "type": "ADVISORY",
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    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "glibc security update",
  "upstream": [
    "CVE-2026-86805",
    "CVE-2026-95818"
  ]
}

CVE-2026-86805 (GCVE-0-2026-86805)

Vulnerability from cvelistv5 – Published: 2026-09-22 15:55 – Updated: 2026-09-23 03:55

Title

AT_SECURE programs may load attacker-controlled code via $ORIGIN

Summary

A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared object and execute arbitrary code with the elevated privileges of the program. Exploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by ".." traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 00:00 UTC

CWE

CWE-367 - Time-of-check time-of-use (TOCTOU) race condition

Assigner

glibc redhat root Scorecard

References

2 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=34360	issue-tracking
https://sourceware.org/git/?p=glibc.git;a=blob_pl…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.14 , < 2.45 (custom)

Credits

Jann Horn

Show details on NVD website

JSON

To clipboard

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CVE-2026-95818 (GCVE-0-2026-95818)

Vulnerability from cvelistv5 – Published: 2026-09-22 16:50 – Updated: 2026-09-22 18:21

Title

AT_SECURE program buffer overflow via $ORIGIN processing

Summary

A stack-based buffer overflow in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to crash or corrupt the memory of setuid/setgid (AT_SECURE) programs. When such a program's DT_RPATH or DT_RUNPATH begins with $ORIGIN and is followed by NUL or '/' the loader both reads past the end of the path buffer and writes past the end of a stack-allocated internal buffer. The corrupted loader stack can lead to a loader crash (denial of service) and limited disclosure of process memory.

Severity

3.6 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 18:21 UTC

CWE

CWE-121 - Stack-based buffer overflow

Assigner

glibc redhat root Scorecard

References

2 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=34360	issue-tracking
https://sourceware.org/git/?p=glibc.git;a=blob_pl…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.14 , < 2.45 (custom)

Credits

AISLE in partnership with Red Hat

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.

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.

Action not permitted

OESA-2026-4154 (CVE-2026-86805)

CVE-2026-86805 (GCVE-0-2026-86805)

CVE-2026-95818 (GCVE-0-2026-95818)

Tags

Sightings

Nomenclature

Related by attack behaviour