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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
VLAI
Title
ksmbd: fix use-after-free by using call_rcu() for oplock_info
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().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:37:14+00:00",
      "cve": "CVE-2026-43376",
      "id": "CVE-2026-43376",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix use-after-free by using call_rcu() for oplock_info",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43376.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:20:16Z",
      "cve": "CVE-2026-43376",
      "id": "CVE-2026-43376",
      "initial_release_date": "2026-05-13T03:34:43Z",
      "product_status:known_not_affected": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43376",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43376.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.