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CVE-2025-21901 (GCVE-0-2025-21901)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:26 – Updated: 2026-08-05 11:55
VLAI
Title
RDMA/bnxt_re: Add sanity checks on rdev validity
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: Add sanity checks on rdev validity There is a possibility that ulp_irq_stop and ulp_irq_start callbacks will be called when the device is in detached state. This can cause a crash due to NULL pointer dereference as the rdev is already freed.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:24 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cc5b9b48d44756a87170f3901c6c2fd99e6b89b2 , < aed1bc673907e3df372b317c10ff2f3582f8bf1a (git)
Affected: cc5b9b48d44756a87170f3901c6c2fd99e6b89b2 , < 8cb0eef46d70a99c88c26a1addb7fd955242e0e6 (git)
Affected: cc5b9b48d44756a87170f3901c6c2fd99e6b89b2 , < f0df225d12fcb049429fb5bf5122afe143c2dd15 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.18 , ≤ 6.12.* (semver)
Unaffected: 6.13.6 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-21901\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:24:32.667966Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:37:24.679Z\"}}], \"cna\": {\"title\": \"RDMA/bnxt_re: Add sanity checks on rdev validity\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable callbacks are driven by local device-management and error-recovery paths (ethtool ring/channel reconfiguration, devlink/FW reset, SR-IOV reconfiguration, PM suspend/resume, PCIe AER), not by data received from a remote peer. A remote RoCE/Ethernet peer cannot reach `bnxt_re_stop_irq()`/`bnxt_re_start_irq()`.\\nAC:L - In the AER and FW-recovery sequences the L2 driver unconditionally calls `bnxt_ulp_irq_stop()`/`bnxt_ulp_irq_restart()` after `bnxt_ulp_stop()` has already freed `rdev`, so the stale-pointer dereference is deterministic rather than racy. Where a window must be hit, the attacker drives both sides \\u2014 initiating the reset/suspend and issuing the ring-reservation request that calls `bnxt_ulp_irq_stop()`.\\nPR:L - Entering the detached window needs only an unprivileged-reachable action such as a logind-permitted system suspend/resume cycle, or a CAP_NET_ADMIN-scoped ethtool ring/channel reconfiguration available to non-root network workloads; once detached, the use-after-free fires from the driver\u0027s own recovery path with no further privilege. It does not require full root in the initial namespace.\\nUI:N - No victim action is needed \\u2014 the free and the subsequent dereference both occur inside the driver\u0027s suspend/irq-restart sequence once the reset or suspend is under way.\\nS:U - The corruption is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\\nC:H - This is a use-after-free on the freed `bnxt_re_dev`: `bnxt_re_start_irq()` reads `rdev-\u003enqr` and `rdev-\u003enqr-\u003enum_msix` out of the freed slab, so an attacker who reclaims the object controls a pointer that is then followed, yielding an arbitrary-read primitive and disclosure of kernel memory.\\nI:H - `bnxt_re_stop_irq()` performs `set_bit()` writes directly into the freed object and `wake_up_all()` walks a wait-queue list from freed memory invoking `wq_entry-\u003efunc()`, while `bnxt_re_start_irq()` writes `rdev-\u003enqr-\u003emsix_entries[indx].vector` through a pointer read from the freed slab \\u2014 together a write-what-where and control-flow hijack primitive.\\nA:H - Even without heap grooming the dereference of the freed `rdev` (typically a NULL `rdev-\u003enqr` or poisoned contents) causes a kernel oops/panic, and it occurs precisely during firmware/PCIe error recovery, turning a recoverable device fault into a full system crash.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"cc5b9b48d44756a87170f3901c6c2fd99e6b89b2\", \"lessThan\": \"aed1bc673907e3df372b317c10ff2f3582f8bf1a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cc5b9b48d44756a87170f3901c6c2fd99e6b89b2\", \"lessThan\": \"8cb0eef46d70a99c88c26a1addb7fd955242e0e6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"cc5b9b48d44756a87170f3901c6c2fd99e6b89b2\", \"lessThan\": \"f0df225d12fcb049429fb5bf5122afe143c2dd15\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/infiniband/hw/bnxt_re/main.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.12.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/infiniband/hw/bnxt_re/main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/aed1bc673907e3df372b317c10ff2f3582f8bf1a\"}, {\"url\": \"https://git.kernel.org/stable/c/8cb0eef46d70a99c88c26a1addb7fd955242e0e6\"}, {\"url\": \"https://git.kernel.org/stable/c/f0df225d12fcb049429fb5bf5122afe143c2dd15\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/bnxt_re: Add sanity checks on rdev validity\\n\\nThere is a possibility that ulp_irq_stop and ulp_irq_start\\ncallbacks will be called when the device is in detached state.\\nThis can cause a crash due to NULL pointer dereference as\\nthe rdev is already freed.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.18\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.6\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:55:16.513Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21901\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:55:16.513Z\", \"dateReserved\": \"2024-12-29T08:45:45.785Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-01T15:26:51.807Z\", \"assignerShortName\": \"Linux\"}",
      "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.