CVE-2026-63973 (GCVE-0-2026-63973)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
net: mana: Add NULL guards in teardown path to prevent panic on attach failure
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mana: Add NULL guards in teardown path to prevent panic on attach failure When queue allocation fails partway through, the error cleanup frees and NULLs apc->tx_qp and apc->rxqs. Multiple teardown paths such as mana_remove(), mana_change_mtu() recovery, and internal error handling in mana_alloc_queues() can subsequently call into functions that dereference these pointers without NULL checks: - mana_chn_setxdp() dereferences apc->rxqs[0], causing a NULL pointer dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26). - mana_destroy_vport() iterates apc->rxqs without a NULL check. - mana_fence_rqs() iterates apc->rxqs without a NULL check. - mana_dealloc_queues() iterates apc->tx_qp without a NULL check. Add NULL guards for apc->rxqs in mana_fence_rqs(), mana_destroy_vport(), and before the mana_chn_setxdp() call. Add a NULL guard for apc->tx_qp in mana_dealloc_queues() to skip TX queue draining when TX queues were never allocated or already freed.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < da7e4a1aaf397af6a094f640c92d6bc7564c10db (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 95e414f8324385771bdfd6d497a01d5593813ccb (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 26a96fa81496afe7d162d172ccdc8cb9dbc685d2 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < da87896f34e0a51489811d1a684e2953099ca98f (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 0a9c520fdcb1cb2e79c163c12d359b5e1ee40007 (git)
Affected: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f , < 17bfe0a8c014ee1d542ad352cd6a0a505361664a (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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            "drivers/net/ethernet/microsoft/mana/mana_en.c"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Add NULL guards in teardown path to prevent panic on attach failure\n\nWhen queue allocation fails partway through, the error cleanup frees\nand NULLs apc-\u003etx_qp and apc-\u003erxqs. Multiple teardown paths such as\nmana_remove(), mana_change_mtu() recovery, and internal error handling\nin mana_alloc_queues() can subsequently call into functions that\ndereference these pointers without NULL checks:\n\n- mana_chn_setxdp() dereferences apc-\u003erxqs[0], causing a NULL pointer\n  dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26).\n- mana_destroy_vport() iterates apc-\u003erxqs without a NULL check.\n- mana_fence_rqs() iterates apc-\u003erxqs without a NULL check.\n- mana_dealloc_queues() iterates apc-\u003etx_qp without a NULL check.\n\nAdd NULL guards for apc-\u003erxqs in mana_fence_rqs(),\nmana_destroy_vport(), and before the mana_chn_setxdp() call. Add a\nNULL guard for apc-\u003etx_qp in mana_dealloc_queues() to skip TX queue\ndraining when TX queues were never allocated or already freed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:59.263Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/da7e4a1aaf397af6a094f640c92d6bc7564c10db"
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          "url": "https://git.kernel.org/stable/c/95e414f8324385771bdfd6d497a01d5593813ccb"
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          "url": "https://git.kernel.org/stable/c/17bfe0a8c014ee1d542ad352cd6a0a505361664a"
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    "cveId": "CVE-2026-63973",
    "datePublished": "2026-07-19T14:55:59.263Z",
    "dateReserved": "2026-07-19T07:54:57.024Z",
    "dateUpdated": "2026-07-19T14:55:59.263Z",
    "state": "PUBLISHED"
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      "date": "2026-07-21",
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T11:16:12+00:00",
      "cve": "CVE-2026-63973",
      "id": "CVE-2026-63973",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: mana: Add NULL guards in teardown path to prevent panic on attach failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63973.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

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.