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CVE-2026-74379 (GCVE-0-2026-74379)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:18
VLAI
Title
dax/kmem: account for partial discontiguous resource upon removal
Summary
In the Linux kernel, the following vulnerability has been resolved: dax/kmem: account for partial discontiguous resource upon removal When dev_dax_kmem_probe() partially succeeds (at least one range is mapped) but a subsequent range fails request_mem_region() or add_memory_driver_managed(), the probe silently continues, ultimately returning success, but with the corresponding range resource NULL'ed out. dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if the underlying resource exists. When remove_memory() is called later, it returns 0 because the memory was never added which causes dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can be removed and attempts cleanup on a NULL pointer. Fix this by skipping these ranges altogether, noting that these cases are considered success, such that the cleanup is still reached when all actually-added ranges are successfully removed.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < ef4fc53898bd6c4d0119cc6d419ebef7f2560f31 (git)
Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < 5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb (git)
Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < d47b0b8a69a13e06afafa54723f3e8c99b0c788f (git)
Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < 799e54c510a03a65a57627018a817838d72f35bd (git)
Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < 598ed7393a639c7547b28ff3e14db9f1ac37c132 (git)
Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < 30ea97affbcce236c57287c82dc6ef7a29c63b76 (git)
Affected: 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 , < 8aa442cfce79e2d69e72fc8e0c0864ac2971149d (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndax/kmem: account for partial discontiguous resource upon removal\n\nWhen dev_dax_kmem_probe() partially succeeds (at least one range is\nmapped) but a subsequent range fails request_mem_region() or\nadd_memory_driver_managed(), the probe silently continues, ultimately\nreturning success, but with the corresponding range resource NULL\u0027ed out.\n\ndev_dax_kmem_remove() iterates over all dax_device ranges regardless of if\nthe underlying resource exists.  When remove_memory() is called later, it\nreturns 0 because the memory was never added which causes\ndev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can\nbe removed and attempts cleanup on a NULL pointer.\n\nFix this by skipping these ranges altogether, noting that these cases are\nconsidered success, such that the cleanup is still reached when all\nactually-added ranges are successfully removed."
        }
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        "dateUpdated": "2026-08-17T05:18:16.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-20T20:57:20+00:00",
      "cve": "CVE-2026-74379",
      "id": "CVE-2026-74379",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dax/kmem: account for partial discontiguous resource upon removal",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74379.json",
      "version": "3"
    }
  }
}



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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

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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.