CVE-2024-26872 (GCVE-0-2024-26872)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-08-05 11:28
VLAI
Title
RDMA/srpt: Do not register event handler until srpt device is fully setup
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/srpt: Do not register event handler until srpt device is fully setup Upon rare occasions, KASAN reports a use-after-free Write in srpt_refresh_port(). This seems to be because an event handler is registered before the srpt device is fully setup and a race condition upon error may leave a partially setup event handler in place. Instead, only register the event handler after srpt device initialization is complete.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < bdd895e0190c464f54f84579e7535d80276f0fc5 (git)
Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < 6413e78086caf7bf15639923740da0d91fdfd090 (git)
Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < e362d007294955a4fb929e1c8978154a64efdcb6 (git)
Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < 85570b91e4820a0db9d9432098778cafafa7d217 (git)
Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < 7104a00fa37ae898a827381f1161fa3286c8b346 (git)
Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < ec77fa12da41260c6bf9e060b89234b980c5130f (git)
Affected: a42d985bd5b234da8b61347a78dc3057bf7bb94d , < c21a8870c98611e8f892511825c9607f1e2cd456 (git)
Create a notification for this product.
Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.214 , ≤ 5.10.* (semver)
Unaffected: 5.15.153 , ≤ 5.15.* (semver)
Unaffected: 6.1.83 , ≤ 6.1.* (semver)
Unaffected: 6.6.23 , ≤ 6.6.* (semver)
Unaffected: 6.7.11 , ≤ 6.7.* (semver)
Unaffected: 6.8.2 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:48:56+00:00",
      "cve": "CVE-2024-26872",
      "id": "CVE-2024-26872",
      "initial_release_date": "2024-04-17T00:00:00+00:00",
      "product_status:fixed": "709",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "22",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/srpt: Do not register event handler until srpt device is fully setup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26872.json",
      "version": "3"
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-23T02:08:50Z",
      "cve": "CVE-2024-26872",
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      "initial_release_date": "2024-04-20T02:08:49Z",
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      "product_status:known_not_affected": "84",
      "product_status:recommended": "581",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26872",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26872.json",
      "version": "73"
    },
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No remote packet processing is involved in reaching the vulnerable window.\\nAC:L - The attacker controls both sides of the race: repeated `rdma link add`/`del` of soft-RoCE devices re-enters `srpt_add_one()` at will, while concurrent netdev link flaps generate `IB_EVENT_PORT_ACTIVE`/`IB_EVENT_PORT_ERR` inside the unprotected window, and keeping the netdev down makes `rdma_query_gid()` fail to force the `err_port` free path.\\nPR:L - `nldev_newlink` is gated only by `netlink_capable(skb, CAP_NET_ADMIN)`, which resolves against the netns-owning user namespace, so an unprivileged user satisfies it via `unshare -Urn`; RDMA_NL_NLDEV is explicitly allowed in non-init net namespaces and `rxe_newlink()` adds no further restriction.\\nUI:N - The attacker triggers device registration and the async IB events entirely from their own processes; no action by any other user or administrator is required.\\nS:U - The corruption is confined to kernel slab memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The use-after-free on the freed `srpt_device`/`srpt_port` allocation lets the attacker reclaim the slab object with a chosen structure, turning the stale `sport` reference into a means of reading and disclosing arbitrary kernel memory.\\nI:H - `srpt_refresh_port()` writes into the freed object \\u2014 `sm_lid`, `lid`, a 16-byte `gid`, and two `snprintf()`-formatted strings \\u2014 giving a multi-byte write into attacker-sprayed heap memory that can corrupt adjacent kernel structures and be leveraged for control-flow hijacking.\\nA:H - Both failure modes crash the kernel: `schedule_work()` on a zeroed `work_struct` makes the kworker call a NULL `work-\u003efunc`, and the use-after-free write reliably produces oopses/panics.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.