Vulnerability-Lookup

FKIE_CVE-2026-98052

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 15:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: net: bcmasp: clear txcb->last before writing each descriptor bcmasp_xmit() only wrote txcb->last = true for the final fragment of an SKB; non-final fragments left the field untouched. If a descriptor slot was reused while it still held a stale true from a previous SKB (possible when tx_spb_ring_full() underreported fullness), bcmasp_tx_reclaim() would see last == true mid-SKB and call dev_consume_skb_any() prematurely, freeing the sk_buff while its remaining fragments were still in flight. Unconditionally clear txcb->last before the conditional set so every descriptor slot starts from a known false state regardless of what a prior transmission left behind.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9b26b54861ce05307d39a54ddedddf8747419614",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            },
            {
              "lessThan": "47a5cecca925ceb175d5adf712e667acf78f475f",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            },
            {
              "lessThan": "17e6ad484dea5ddf1c4a3d6ec77a5929161234de",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            },
            {
              "lessThan": "18e5e0ec0e9282c897e2aa81a3e43ccaee03b003",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb-\u003elast before writing each descriptor\n\nbcmasp_xmit() only wrote txcb-\u003elast = true for the final fragment\nof an SKB; non-final fragments left the field untouched.  If a\ndescriptor slot was reused while it still held a stale true from\na previous SKB (possible when tx_spb_ring_full() underreported\nfullness), bcmasp_tx_reclaim() would see last == true mid-SKB and\ncall dev_consume_skb_any() prematurely, freeing the sk_buff while\nits remaining fragments were still in flight.\n\nUnconditionally clear txcb-\u003elast before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind."
    }
  ],
  "id": "CVE-2026-98052",
  "lastModified": "2026-09-25T15:18:05.023",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-25T11:17:34.120",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-98052 (GCVE-0-2026-98052)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:24 – Updated: 2026-09-25 14:41

Title

net: bcmasp: clear txcb->last before writing each descriptor

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/9b26b54861ce05307…
https://git.kernel.org/stable/c/47a5cecca925ceb17…
https://git.kernel.org/stable/c/17e6ad484dea5ddf1…
https://git.kernel.org/stable/c/18e5e0ec0e9282c89…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 490cb412007de593e07c1d3e2b1ec4233886707c , < 9b26b54861ce05307d39a54ddedddf8747419614 (git) Affected: 490cb412007de593e07c1d3e2b1ec4233886707c , < 47a5cecca925ceb175d5adf712e667acf78f475f (git) Affected: 490cb412007de593e07c1d3e2b1ec4233886707c , < 17e6ad484dea5ddf1c4a3d6ec77a5929161234de (git) Affected: 490cb412007de593e07c1d3e2b1ec4233886707c , < 18e5e0ec0e9282c897e2aa81a3e43ccaee03b003 (git)
Linux	Linux	Affected: 6.6 Unaffected: 0 , < 6.6 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9b26b54861ce05307d39a54ddedddf8747419614",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            },
            {
              "lessThan": "47a5cecca925ceb175d5adf712e667acf78f475f",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            },
            {
              "lessThan": "17e6ad484dea5ddf1c4a3d6ec77a5929161234de",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            },
            {
              "lessThan": "18e5e0ec0e9282c897e2aa81a3e43ccaee03b003",
              "status": "affected",
              "version": "490cb412007de593e07c1d3e2b1ec4233886707c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb-\u003elast before writing each descriptor\n\nbcmasp_xmit() only wrote txcb-\u003elast = true for the final fragment\nof an SKB; non-final fragments left the field untouched.  If a\ndescriptor slot was reused while it still held a stale true from\na previous SKB (possible when tx_spb_ring_full() underreported\nfullness), bcmasp_tx_reclaim() would see last == true mid-SKB and\ncall dev_consume_skb_any() prematurely, freeing the sk_buff while\nits remaining fragments were still in flight.\n\nUnconditionally clear txcb-\u003elast before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind."
        }
      ],
      "metrics": [
        {
          "cvssV3_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",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in bcmasp_xmit() TX ring bookkeeping, reached via sendmsg/sendfile -\u003e dev_queue_xmit -\u003e bcmasp_xmit; no malformed input exists and the trigger is TX ring pressure from multi-fragment (NETIF_F_SG) SKBs, which a local user produces by flooding sockets through the bcmasp interface.\nAC:L - The attacker controls the traffic load: flooding multi-frag SKBs makes buggy tx_spb_ring_full() let bcmasp_xmit overwrite unreclaimed slots, so non-final fragments repeatedly land in slots holding a stale txcb-\u003elast=true; no hardware state outside the attacker\u0027s control is needed.\nPR:L - Sending TCP/UDP traffic that egresses the bcmasp netdev needs only an ordinary unprivileged local account; there is no capability check anywhere on the transmit path.\nUI:N - No victim action is involved; the attacker generates the transmit traffic entirely by themselves.\nS:U - The corruption affects kernel sk_buff/page memory in the same kernel that runs the driver; no VM or IOMMU boundary is crossed.\nC:H - bcmasp_tx_reclaim() frees the skb (dev_consume_skb_any) while its later fragments are still mapped for DMA, so freed and reallocated pages can be transmitted on the wire and the stale skb is accessed again: a use-after-free with disclosure potential.\nI:H - When the real final fragment is reclaimed later, dev_consume_skb_any() is called a second time on the same skb, a double free/UAF of sk_buff and frag pages that could be groomed into slab corruption.\nA:H - Double freeing the sk_buff and touching freed memory in bcmasp_tx_reclaim() from TX NAPI causes slab corruption and kernel oops/panic on the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T14:41:58.081Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614"
        },
        {
          "url": "https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f"
        },
        {
          "url": "https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de"
        },
        {
          "url": "https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003"
        }
      ],
      "title": "net: bcmasp: clear txcb-\u003elast before writing each descriptor",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98052",
    "datePublished": "2026-09-25T10:24:00.441Z",
    "dateReserved": "2026-09-25T10:19:56.072Z",
    "dateUpdated": "2026-09-25T14:41:58.081Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

FKIE_CVE-2026-98052

CVE-2026-98052 (GCVE-0-2026-98052)

Tags

Sightings

Nomenclature

Related by attack behaviour