Vulnerability-Lookup

FKIE_CVE-2026-52955

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-07-15 01:16

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in crush_decode() A message of type CEPH_MSG_OSD_MAP containing a crush map with at least one bucket has two fields holding the bucket algorithm. If the values in these two fields differ, an out-of-bounds access can occur. This is the case because the first algorithm field (alg) is used to allocate the correct amount of memory for a bucket of this type, while the second algorithm field inside the bucket (b->alg) is used in the subsequent processing. This patch fixes the issue by adding a check that compares alg and b->alg and aborts the processing in case they differ. Furthermore, b->alg is set to 0 in this case, because the destruction of the crush map also uses this field to determine the bucket type, which can again result in an out-of-bounds access when trying to free the memory pointed to by the fields of the bucket. To correctly free the memory allocated for the bucket in such a case, the corresponding call to kfree is moved from the algorithm-specific crush_destroy_bucket functions to the generic crush_destroy_bucket().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-52955	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2492328	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	2.6.34
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix potential out-of-bounds access in crush_decode()\n\nA message of type CEPH_MSG_OSD_MAP containing a crush map with at least\none bucket has two fields holding the bucket algorithm. If the values\nin these two fields differ, an out-of-bounds access can occur. This is\nthe case because the first algorithm field (alg) is used to allocate\nthe correct amount of memory for a bucket of this type, while the second\nalgorithm field inside the bucket (b-\u003ealg) is used in the subsequent\nprocessing.\n\nThis patch fixes the issue by adding a check that compares alg and\nb-\u003ealg and aborts the processing in case they differ. Furthermore,\nb-\u003ealg is set to 0 in this case, because the destruction of the crush\nmap also uses this field to determine the bucket type, which can again\nresult in an out-of-bounds access when trying to free the memory pointed\nto by the fields of the bucket. To correctly free the memory allocated\nfor the bucket in such a case, the corresponding call to kfree is moved\nfrom the algorithm-specific crush_destroy_bucket functions to the\ngeneric crush_destroy_bucket()."
    }
  ],
  "id": "CVE-2026-52955",
  "lastModified": "2026-07-15T01:16:24.340",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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        "type": "Secondary"
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      {
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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  "published": "2026-06-24T17:17:05.670",
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  "weaknesses": [
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          "value": "CWE-125"
        }
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      "source": "nvd@nist.gov",
      "type": "Primary"
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    {
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          "value": "CWE-131"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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}

CVE-2026-52955 (GCVE-0-2026-52955)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-07-15 00:45

Title

libceph: Fix potential out-of-bounds access in crush_decode()

Summary

Severity

9.8 (Critical)


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

4.7 (Medium)


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

CWE

CWE-131 - Incorrect Calculation of Buffer Size

Assigner

Linux

References

11 references

URL	Tags
https://git.kernel.org/stable/c/6e70ef53e818c53ea…
https://git.kernel.org/stable/c/ebe76d58a48a48031…
https://git.kernel.org/stable/c/3f42508191e129ee6…
https://git.kernel.org/stable/c/ea0d42137f0c06da7…
https://git.kernel.org/stable/c/cceb10023e76bc89f…
https://git.kernel.org/stable/c/0f3604cbe4df14c5e…
https://git.kernel.org/stable/c/fb176a99e4c1a5a84…
https://git.kernel.org/stable/c/4c79fc2d598694bda…
https://access.redhat.com/security/cve/CVE-2026-52955	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492328	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

7 products

Vendor	Product	Version
Linux	Linux	Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 6e70ef53e818c53eab28d7b0026b7fd03dddaba5 (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < ebe76d58a48a48031b98543d86c4cd30a825b622 (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 3f42508191e129ee6b5ea96578d5cab14f2a013a (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < ea0d42137f0c06da71e37ffc647aab4c5309599a (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5 (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 0f3604cbe4df14c5e58288ac9f57511e726a222d (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < fb176a99e4c1a5a8448a83d83d3606203ba81faa (git) Affected: f24e9980eb860d8600cbe5ef3d2fd9295320d229 , < 4c79fc2d598694bda845b46229c9d48b65042970 (git)
Linux	Linux	Affected: 2.6.34 Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Show details on NVD website

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{
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              "confidentialityImpact": "NONE",
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          "product": "Linux",
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            "net/ceph/osdmap.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "status": "unaffected",
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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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

FKIE_CVE-2026-52955

CVE-2026-52955 (GCVE-0-2026-52955)

Tags

Sightings

Nomenclature