Vulnerability-Lookup

FKIE_CVE-2024-26689

Vulnerability from fkie_nvd - Published: 2024-04-03 15:15 - Updated: 2026-08-04 11:16

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html	Mailing List

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.8
linux	linux_kernel	6.8
linux	linux_kernel	6.8
debian	debian_linux	10.0

JSON

To clipboard

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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: prevent use-after-free in encode_cap_msg()\n\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - \u0027ceph_buffer_get(arg-\u003exattr_buf);\u0027. This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - \u0027ceph_buffer_put(ci-\u003ei_xattrs.blob);\u0027. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg-\u003exattr_buf is assigned to ci-\u003ei_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ceph: evita el use-after-free en encode_cap_msg() En fs/ceph/caps.c, en encode_cap_msg(), KASAN detect\u00f3 el error \"use after free\" en este l\u00ednea - \u0027ceph_buffer_get(arg-\u0026gt;xattr_buf);\u0027. Esto implica que antes de que el recuento pudiera incrementarse aqu\u00ed, fue liberado. En el mismo archivo, en \"handle_cap_grant()\", el refcount se reduce en esta l\u00ednea: \u0027ceph_buffer_put(ci-\u0026gt;i_xattrs.blob);\u0027. Parece que se produjo una ejecuci\u00f3n y la \u00faltima l\u00ednea liber\u00f3 el recurso antes de que la primera l\u00ednea pudiera incrementarlo. __send_cap() llama a encode_cap_msg() y ceph_check_caps() llama a __send_cap() despu\u00e9s de llamar a __prep_cap(). __prep_cap() es donde arg-\u0026gt;xattr_buf se asigna a ci-\u0026gt;i_xattrs.blob. Este es el punto donde se debe aumentar el recuento para evitar el error \"use after free\"."
    }
  ],
  "id": "CVE-2024-26689",
  "lastModified": "2026-08-04T11:16:56.117",
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          "userInteraction": "NONE",
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}

CVE-2024-26689 (GCVE-0-2024-26689)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:54 – Updated: 2026-08-05 11:26

Title

ceph: prevent use-after-free in encode_cap_msg()

Summary

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-08-15 19:26 UTC

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/8180d0c27b93a6eb6…
https://git.kernel.org/stable/c/70e329b4407623902…
https://git.kernel.org/stable/c/f3f98d7d84b318280…
https://git.kernel.org/stable/c/ae20db45e482303a2…
https://git.kernel.org/stable/c/7958c1bf5b03c6f1f…
https://git.kernel.org/stable/c/cda4672da1c26835d…
https://lists.debian.org/debian-lts-announce/2024…	x_transferred

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < 8180d0c27b93a6eb60da1b08ea079e3926328214 (git) Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < 70e329b440762390258a6fe8c0de93c9fdd56c77 (git) Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < f3f98d7d84b31828004545e29fd7262b9f444139 (git) Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < ae20db45e482303a20e56f2db667a9d9c54ac7e7 (git) Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < 7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc (git) Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < cda4672da1c26835dcbd7aec2bfed954eda9b5ef (git)
Linux	Linux	Affected: 2.6.34 Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.10.210 , ≤ 5.10.* (semver) Unaffected: 5.15.149 , ≤ 5.15.* (semver) Unaffected: 6.1.79 , ≤ 6.1.* (semver) Unaffected: 6.6.18 , ≤ 6.6.* (semver) Unaffected: 6.7.6 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-08-15T19:26:55.316031Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-08-15T19:27:03.603Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/caps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8180d0c27b93a6eb60da1b08ea079e3926328214",
              "status": "affected",
              "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f",
              "versionType": "git"
            },
            {
              "lessThan": "70e329b440762390258a6fe8c0de93c9fdd56c77",
              "status": "affected",
              "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f",
              "versionType": "git"
            },
            {
              "lessThan": "f3f98d7d84b31828004545e29fd7262b9f444139",
              "status": "affected",
              "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f",
              "versionType": "git"
            },
            {
              "lessThan": "ae20db45e482303a20e56f2db667a9d9c54ac7e7",
              "status": "affected",
              "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f",
              "versionType": "git"
            },
            {
              "lessThan": "7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc",
              "status": "affected",
              "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f",
              "versionType": "git"
            },
            {
              "lessThan": "cda4672da1c26835dcbd7aec2bfed954eda9b5ef",
              "status": "affected",
              "version": "9030aaf9bf0a1eee47a154c316c789e959638b0f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/caps.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.34"
            },
            {
              "lessThan": "2.6.34",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.149",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.79",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.210",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.149",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.79",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.18",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.7.6",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.8",
                  "versionStartIncluding": "2.6.34",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: prevent use-after-free in encode_cap_msg()\n\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - \u0027ceph_buffer_get(arg-\u003exattr_buf);\u0027. This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - \u0027ceph_buffer_put(ci-\u003ei_xattrs.blob);\u0027. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg-\u003exattr_buf is assigned to ci-\u003ei_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The freeing half of the race executes in `handle_cap_grant()`/`ceph_fill_inode()` while parsing `CEPH_MSG_CLIENT_CAPS` messages and reply traces received from the remote Ceph MDS, so a co-tenant CephFS client, a malicious/compromised MDS, or a MITM on the (by-default unencrypted) msgr connection controls the timing and content of the free. The freed buffer\u0027s contents are additionally marshalled into `msg-\u003emiddle` and transmitted back over the network to the MDS.\nAC:L - The attacker drives both sides of the race \u2014 local/co-tenant `setxattr` traffic opens the unlocked `__prep_cap()`\u2192`__send_cap()` window, while concurrent access to the same inode from another client forces the MDS to emit the cap grant with a higher `xattr_version` that drops the last reference \u2014 and the sequence can be retried without limit until the window is hit.\nPR:L - Exploitation requires only an ordinary unprivileged account with write access to a file on an already-mounted CephFS (no capabilities are checked anywhere on the `setxattr`\u2192`ceph_check_caps`\u2192`__prep_cap` path), or an equally unprivileged co-tenant account on the same shared CephFS.\nUI:N - No victim action is needed at exploit time; the CephFS mount is pre-existing deployment configuration, and the attacker\u0027s own syscalls and MDS traffic supply every step of the race.\nS:U - The corruption is confined to kernel heap objects within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free whose stale `vec.iov_base`/`vec.iov_len` are read back and sent to the MDS as the cap message middle section, leaking reallocated kernel heap contents to a remote peer, and heap grooming of the small `kmalloc-64` `ceph_buffer` object generalizes this into an arbitrary kernel-memory read.\nI:H - `ceph_buffer_get()` performs a `kref_get()` increment directly into freed memory, corrupting a refcount field of whatever object is reallocated into that slab slot, and the later `ceph_buffer_put()`/`kvfree()` on stale pointers yields a double-free/arbitrary-free \u2014 both standard stepping stones to arbitrary write and control-flow hijack.\nA:H - The use-after-free was caught by KASAN and, unmitigated, corrupts slab metadata and refcounts leading to oops, double-free and kernel panic, which the attacker can trigger repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:26:42.116Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214"
        },
        {
          "url": "https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef"
        }
      ],
      "title": "ceph: prevent use-after-free in encode_cap_msg()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26689",
    "datePublished": "2024-04-03T14:54:50.885Z",
    "dateReserved": "2024-02-19T14:20:24.154Z",
    "dateUpdated": "2026-08-05T11:26:42.116Z",
    "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.

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.