CVE-2024-46799 (GCVE-0-2024-46799)

Vulnerability from cvelistv5 – Published: 2024-09-18 07:12 – Updated: 2026-08-05 11:38
VLAI
Title
net: ethernet: ti: am65-cpsw: Fix NULL dereference on XDP_TX
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: ti: am65-cpsw: Fix NULL dereference on XDP_TX If number of TX queues are set to 1 we get a NULL pointer dereference during XDP_TX. ~# ethtool -L eth0 tx 1 ~# ./xdp-trafficgen udp -A <ipv6-src> -a <ipv6-dst> eth0 -t 2 Transmitting on eth0 (ifindex 2) [ 241.135257] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030 Fix this by using actual TX queues instead of max TX queues when picking the TX channel in am65_cpsw_ndo_xdp_xmit().
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/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 2024-09-29 14:21 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8acacc40f7337527ff84cd901ed2ef0a2b95b2b6 , < 2e7189d2b1de51fc2567676cd4f96c0fe0960b9f (git)
Affected: 8acacc40f7337527ff84cd901ed2ef0a2b95b2b6 , < 0a50c35277f96481a5a6ed5faf347f282040c57d (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.10.10 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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                  "value": "AV:N - The vulnerable function is the XDP_REDIRECT egress hook, invoked from `bq_xmit_all()` while processing received network frames, so a remote sender\u0027s packet drives the code path on an XDP-forwarding TI CPSW gateway. No local access to the target is required to deliver the triggering frame.\nAC:L - Given the vulnerable configuration (TX channels reduced below CPU count with an XDP redirect program attached), every redirected frame handled on a CPU index at or above `tx_ch_num` faults deterministically, and with one TX channel that is most CPUs on a 4- or 8-core SoC. The attacker can further steer which RX CPU handles the flow by varying source ports, so no condition outside their control must align.\nPR:N - Triggering only requires sending a frame that the already-loaded XDP program redirects out the CPSW port; no credentials or account on the target are needed. The privileged steps (`ethtool -L`, XDP attach) are the administrator\u0027s configuration, not part of the attack.\nUI:N - The crash occurs autonomously in softirq/NAPI context as soon as a redirected frame is processed. No victim action is required.\nS:U - The fault is confined to the kernel of the affected host; no VM, IOMMU, or sandbox boundary is crossed. Impact stays within the same security authority.\nC:N - The index stays inside the fixed 8-element `tx_chns[]` array, so there is no out-of-bounds read, and the dereference is of a NULL `desc_pool` at a small fixed offset. No kernel memory contents are read or disclosed.\nI:N - No out-of-bounds or use-after-free write occurs; the faulting address is in the unmappable low page (blocked by `mmap_min_addr` and arm64 PAN), so no write or control-flow primitive is available. Nothing is modified before the oops.\nA:H - The NULL dereference produces a kernel oops in softirq/NAPI context, killing the network datapath and typically panicking the system on embedded configurations with `panic_on_oops`. It repeats on every redirected packet, so the denial of service is total and sustained."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:38:38.529Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2e7189d2b1de51fc2567676cd4f96c0fe0960b9f"
            },
            {
              "url": "https://git.kernel.org/stable/c/0a50c35277f96481a5a6ed5faf347f282040c57d"
            }
          ],
          "title": "net: ethernet: ti: am65-cpsw: Fix NULL dereference on XDP_TX",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-46799",
        "datePublished": "2024-09-18T07:12:53.508Z",
        "dateReserved": "2024-09-11T15:12:18.280Z",
        "dateUpdated": "2026-08-05T11:38:38.529Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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