{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98052",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98052"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "net: bcmasp: clear txcb->last before writing each descriptor",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmasp: clear txcb->last before writing each descriptor\n\nbcmasp_xmit() only wrote txcb->last = 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->last before the conditional set so every\ndescriptor slot starts from a known false state regardless of what a\nprior transmission left behind.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98052"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1e213ba7cb3b9dd97ac2e0a1054e6d0d1d91f5bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b26b54861ce05307d39a54ddedddf8747419614"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/47a5cecca925ceb175d5adf712e667acf78f475f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/17e6ad484dea5ddf1c4a3d6ec77a5929161234de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/18e5e0ec0e9282c897e2aa81a3e43ccaee03b003"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is in bcmasp_xmit() TX ring bookkeeping, reached via sendmsg/sendfile -> dev_queue_xmit -> 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->last=true; no hardware state outside the attacker's 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."
    }
  }
}