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CVE-2026-43499 (GCVE-0-2026-43499)

Vulnerability from cvelistv5 – Published: 2026-05-21 12:17 – Updated: 2026-09-08 08:48
VLAI
Title
rtmutex: Use waiter::task instead of current in remove_waiter()
Summary
In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from futex_requeue(). In the latter case waiter::task is not current, but remove_waiter() operates on current for the dequeue operation. That results in several problems: 1) the rbtree dequeue happens without waiter::task::pi_lock being held 2) the waiter task's pi_blocked_on state is not cleared, which leaves a dangling pointer primed for UAF around. 3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter task Use waiter::task instead of current in all related operations in remove_waiter() to cure those problems. [ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the changelog ]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-22 03:55 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < f3fa3424bceb128d2be4b3745506b22844b87db7 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < d8cce4773c2b23d819baf5abedc62f7b430e8745 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 8a1fc8d698ac5e5916e3082a0f74450d71f9611f (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 3fb7394a837740770f0d6b4b30567e60786a63f2 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 88614876370aac8ad1050ad785a4c095ba17ac11 (git)
Affected: 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 , < 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 (git)
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Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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          "references": [
            {
              "url": "https://git.kernel.org/stable/c/f3fa3424bceb128d2be4b3745506b22844b87db7"
            },
            {
              "url": "https://git.kernel.org/stable/c/838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd"
            },
            {
              "url": "https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745"
            },
            {
              "url": "https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f"
            },
            {
              "url": "https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166"
            },
            {
              "url": "https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2"
            },
            {
              "url": "https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11"
            },
            {
              "url": "https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"
            }
          ],
          "title": "rtmutex: Use waiter::task instead of current in remove_waiter()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-43499",
        "datePublished": "2026-05-21T12:17:49.281Z",
        "dateReserved": "2026-05-01T14:12:56.014Z",
        "dateUpdated": "2026-08-26T19:01:26.917Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.