Vulnerability-Lookup

FKIE_CVE-2026-43376

Vulnerability from fkie_nvd - Published: 2026-05-08 15:16 - Updated: 2026-06-17 10:49

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free by using call_rcu() for oplock_info ksmbd currently frees oplock_info immediately using kfree(), even though it is accessed under RCU read-side critical sections in places like opinfo_get() and proc_show_files(). Since there is no RCU grace period delay between nullifying the pointer and freeing the memory, a reader can still access oplock_info structure after it has been freed. This can leads to a use-after-free especially in opinfo_get() where atomic_inc_not_zero() is called on already freed memory. Fix this by switching to deferred freeing using call_rcu().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	6.15
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free by using call_rcu() for oplock_info\n\nksmbd currently frees oplock_info immediately using kfree(), even\nthough it is accessed under RCU read-side critical sections in places\nlike opinfo_get() and proc_show_files().\n\nSince there is no RCU grace period delay between nullifying the pointer\nand freeing the memory, a reader can still access oplock_info\nstructure after it has been freed. This can leads to a use-after-free\nespecially in opinfo_get() where atomic_inc_not_zero() is called on\nalready freed memory.\n\nFix this by switching to deferred freeing using call_rcu()."
    }
  ],
  "id": "CVE-2026-43376",
  "lastModified": "2026-06-17T10:49:28.930",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
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          "baseScore": 9.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  "vulnStatus": "Analyzed",
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

CVE-2026-43376 (GCVE-0-2026-43376)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-08-05 12:27

Title

ksmbd: fix use-after-free by using call_rcu() for oplock_info

Summary

Severity

9.8 (Critical)


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

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/302fef75512b2c832…
https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee…
https://git.kernel.org/stable/c/1d6abf145615dbfe2…
https://git.kernel.org/stable/c/ce8507ee82c888126…
https://git.kernel.org/stable/c/1dfd062caa165ec9d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 296cb5457cc6f4a754c4ae29855f8a253d52bcc6 , < 302fef75512b2c8329a3f5efab1ae7ba2562387a (git) Affected: d54ab1520d43e95f9b2e22d7a05fc9614192e5a5 , < 08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c (git) Affected: 18b4fac5ef17f77fed9417d22210ceafd6525fc7 , < 1d6abf145615dbfe267ce3b0a271f95e3780e18e (git) Affected: 18b4fac5ef17f77fed9417d22210ceafd6525fc7 , < ce8507ee82c888126d8e7565e27c016308d24cde (git) Affected: 18b4fac5ef17f77fed9417d22210ceafd6525fc7 , < 1dfd062caa165ec9d7ee0823087930f3ab8a6294 (git) Affected: d73686367ad68534257cd88a36ca3c52cb8b81d8 (git) Affected: 6.6.88 , < 6.6.130 (semver) Affected: 6.12.25 , < 6.12.78 (semver) Affected: 6.14.4 , < 6.15 (semver)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/oplock.c",
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          ],
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:35.730Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a"
        },
        {
          "url": "https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde"
        },
        {
          "url": "https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294"
        }
      ],
      "title": "ksmbd: fix use-after-free by using call_rcu() for oplock_info",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43376",
    "datePublished": "2026-05-08T14:21:25.854Z",
    "dateReserved": "2026-05-01T14:12:56.006Z",
    "dateUpdated": "2026-08-05T12:27:35.730Z",
    "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.