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net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown A potential race condition exists in mana_hwc_destroy_channel() where hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt handler to dereference freed memory, leading to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp(). mana_smc_teardown_hwc() signals the hardware to stop but does not synchronize against IRQ handlers already executing on other CPUs. The IRQ synchronization only happens in mana_hwc_destroy_cq() via mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler() can dereference freed caller_ctx (and rxq->msg_buf) in mana_hwc_handle_resp(). Fix this by reordering teardown to reverse-of-creation order: destroy the TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This ensures all in-flight interrupt handlers complete before the memory they access is freed.

Announced Source revision 1
Original source ↗

CVE-2026-23454

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23454

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "b88edf12fc3779521ae5f6f1584153b15f7da6df",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "e23bf444512cb85d76012080a76cd1f9e967448e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "249e905571583a434d4ea8d6f92ccc0eef337115",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "2b001901f689021acd7bf2dceed74a1bdcaaa1f9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "afdb1533eb9c05432aeb793a7280fa827c502f5c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "05d345719d85b927cba74afac4d5322de3aa4256",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "fa103fc8f56954a60699a29215cb713448a39e87",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/microsoft/mana/hw_channel.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.20",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/microsoft/mana/hw_channel.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23454

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#27256 · Revision 1
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Publisher date
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