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firewire: ohci: fix NULL pointer dereference in ar_context_release

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: firewire: ohci: fix NULL pointer dereference in ar_context_release During the error handling path of the driver's probe function, a NULL pointer dereference can occur in ar_context_release(). When pci_probe() fails early (e.g., if pcim_enable_device() or MMIO mapping fails), the devres cleanup mechanism invokes release_ohci(). This function unconditionally calls ar_context_release() to clean up the asynchronous receive contexts. However, if ar_context_init() was not yet called, ctx->ohci remains NULL (as the fw_ohci structure is zero-initialized by devres_alloc()). ar_context_release() immediately dereferences ctx->ohci to get the dev pointer before checking if the context was actually initialized, leading to a crash: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:ar_context_release+0x3f/0x380 drivers/firewire/ohci.c:543 Call Trace: release_ohci+0x3f/0x60 drivers/firewire/ohci.c:3567 release_nodes drivers/base/devres.c:546 [inline] devres_release_all+0x1a8/0x260 drivers/base/devres.c:576 device_unbind_cleanup drivers/base/dd.c:597 [inline] really_probe+0x451/0xae0 drivers/base/dd.c:772 To fix this, move the assignment of the dev pointer after the !ctx->buffer check. If ctx->buffer is NULL, it indicates that the context was never successfully initialized and there i

Announced Source revision 1
Original source ↗

CVE-2026-74734

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-2026-74734

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
        "lessThan": "3770a4794a14331c8ca6a674e49c021827521c2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
        "lessThan": "ca2fa74f3200ced6e0a940753ad99844c42ad7c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
        "lessThan": "ed5470771c7ed7f959230c4697f316af83426a90",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
        "lessThan": "7d228ba43279de2d191f25e139fad166409c2c06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5716e58aecdd4f7225c2e46ce903a839fc54f22f",
        "lessThan": "42d217add8d80d6e7d9f58f80d11ea9b07ea113e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/firewire/ohci.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/firewire/ohci.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74734

Source reference: /cveMetadata/cveId

Publisher severity

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Event
#46597 · Revision 1
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