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CVE-2024-36929 (GCVE-0-2024-36929)

Vulnerability from cvelistv5 – Published: 2024-05-30 15:29 – Updated: 2026-08-05 11:32
VLAI
Title
net: core: reject skb_copy(_expand) for fraglist GSO skbs
Summary
In the Linux kernel, the following vulnerability has been resolved: net: core: reject skb_copy(_expand) for fraglist GSO skbs SKB_GSO_FRAGLIST skbs must not be linearized, otherwise they become invalid. Return NULL if such an skb is passed to skb_copy or skb_copy_expand, in order to prevent a crash on a potential later call to skb_gso_segment.
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 2024-06-04 15:42 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < faa83a7797f06cefed86731ba4baa3b4dfdc06c1 (git)
Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < c7af99cc21923a9650533c9d77265c8dd683a533 (git)
Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < 989bf6fd1e1d058e73a364dce1a0c53d33373f62 (git)
Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < cfe34d86ef9765c388f145039006bb79b6c81ac6 (git)
Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < aea5e2669c2863fdd8679c40ee310b3bcaa85aec (git)
Affected: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 , < d091e579b864fa790dd6a0cd537a22c383126681 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.217 , ≤ 5.10.* (semver)
Unaffected: 5.15.159 , ≤ 5.15.* (semver)
Unaffected: 6.1.91 , ≤ 6.1.* (semver)
Unaffected: 6.6.31 , ≤ 6.6.* (semver)
Unaffected: 6.8.10 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.1 (custom)
guessed Create a notification for this product.
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
guessed Create a notification for this product.
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.1 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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              "product": "Linux",
              "programFiles": [
                "net/core/skbuff.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.6"
                },
                {
                  "lessThan": "5.6",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.217",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.159",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.91",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.31",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.8.*",
                  "status": "unaffected",
                  "version": "6.8.10",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.217",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.159",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.91",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.31",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8.10",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: core: reject skb_copy(_expand) for fraglist GSO skbs\n\nSKB_GSO_FRAGLIST skbs must not be linearized, otherwise they become\ninvalid. Return NULL if such an skb is passed to skb_copy or\nskb_copy_expand, in order to prevent a crash on a potential later\ncall to skb_gso_segment."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The invalid skb is manufactured entirely from received UDP traffic \u2014 fraglist GRO aggregates remotely-sourced datagrams, and `udp_gro_receive` marks any UDP packet lacking a local socket as fraglist-eligible, so forwarded flows from arbitrary internet sources qualify. Bridge/overlay ports (VXLAN, GRE, L2TP) carrying such traffic mean the attacker need not sit on the victim\u0027s L2 segment.\nAC:L - The attacker fully controls both preconditions for GRO coalescing \u2014 sending back-to-back same-flow UDP datagrams is sufficient to build the fraglist skb, and the resulting `udp_hdr(seg-\u003enext)-\u003edest` dereference on a NULL `seg-\u003enext` is deterministic, not layout- or timing-dependent. No memory grooming or race win is needed.\nPR:N - The entire path \u2014 NAPI GRO, `netif_receive_skb`, bridge/forwarding `skb_copy`, `validate_xmit_skb` \u2192 `skb_gso_segment` \u2014 runs in softirq on unauthenticated received packets. The attacker needs no account, credentials, or capability on the target.\nUI:N - Triggering requires only that the victim host receive and forward the attacker\u0027s UDP packets, which happens automatically in the receive/transmit softirq. No administrator or user action is involved.\nS:U - The fault occurs in the kernel\u0027s own network stack and its impact is confined to that kernel\u0027s security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:N - The failure is a NULL pointer dereference at a small fixed offset (`udp_hdr(NULL)-\u003edest`), which faults immediately below `mmap_min_addr` rather than reading valid memory. No out-of-bounds read, uninitialized data, or kernel pointer is exposed to the attacker.\nI:N - Nothing is written outside the skb before the oops \u2014 only the packet\u0027s own UDP length field is updated in `__udp_gso_segment_list()`. There is no out-of-bounds write, use-after-free, or type confusion, so no control-flow-hijack or arbitrary-write primitive arises.\nA:H - The NULL dereference happens in softirq context on the transmit path, producing a kernel oops that on a forwarding device typically panics the machine (and is fatal with `panic_on_oops`). An unauthenticated attacker can repeat it at will with a UDP burst, causing complete loss of availability."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:32:08.251Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/faa83a7797f06cefed86731ba4baa3b4dfdc06c1"
            },
            {
              "url": "https://git.kernel.org/stable/c/c7af99cc21923a9650533c9d77265c8dd683a533"
            },
            {
              "url": "https://git.kernel.org/stable/c/989bf6fd1e1d058e73a364dce1a0c53d33373f62"
            },
            {
              "url": "https://git.kernel.org/stable/c/cfe34d86ef9765c388f145039006bb79b6c81ac6"
            },
            {
              "url": "https://git.kernel.org/stable/c/aea5e2669c2863fdd8679c40ee310b3bcaa85aec"
            },
            {
              "url": "https://git.kernel.org/stable/c/d091e579b864fa790dd6a0cd537a22c383126681"
            }
          ],
          "title": "net: core: reject skb_copy(_expand) for fraglist GSO skbs",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-36929",
        "datePublished": "2024-05-30T15:29:21.430Z",
        "dateReserved": "2024-05-30T15:25:07.069Z",
        "dateUpdated": "2026-08-05T11:32:08.251Z",
        "state": "PUBLISHED"
      },
      "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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.