{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  wifi: mwifiex: use the subframe length when parsing A-MSDU TDLS frames  mwifiex_11n_dispatch_amsdu_pkt() splits an A-MSDU with ieee80211_amsdu_to_8023s() and walks the resulting subframes. For each subframe it passes the subframe data pointer to mwifiex_process_tdls_action_frame(), but pairs it with skb-\u003elen, the length of the A-MSDU parent, instead of rx_skb-\u003elen:  \trx_skb = __skb_dequeue(\u0026list); \trx_hdr = (struct rx_packet_hdr *)rx_skb-\u003edata; \tif (ISSUPP_TDLS_ENABLED(priv-\u003eadapter-\u003efw_cap_info) \u0026\u0026 \t    ntohs(rx_hdr-\u003eeth803_hdr.h_proto) == ETH_P_TDLS) { \t\tmwifiex_process_tdls_action_frame(priv, (u8 *)rx_hdr, \t\t\t\t\t\t  skb-\u003elen); \t}  The parent is not a valid description of that buffer, and may not be valid memory at all. ieee80211_amsdu_to_8023s() ends with  \tif (!reuse_skb) \t\tdev_kfree_skb(skb);  and it only sets reuse_skb when the parent is linear, is not a head_frag, and is being consumed as the *last* subframe. So when the parent does not qualify for reuse it has already been freed, and the read of skb-\u003elen is a use-after-free. When it is reused, skb-\u003elen is the length of the last subframe, applied to every earlier subframe, which over-states the buffer whenever an earlier subframe is shorter.  The callee cannot absorb a wrong length, because it derives its own ceiling from the value it is given. Each frame type computes  \ties_len = len - sizeof(struct ethhdr) - TDLS_*_FIX_LEN;  and the element walk is then bounded entirely against that ceiling,  \tfor (end = pos + ies_len; pos + 1 \u003c end; pos += 2 + pos[1]) { \t\tu8 ie_len = pos[1];  \t\tif (pos + 2 + ie_len \u003e end) \t\t\tbreak;  so a too-large len moves end past the end of the subframe and the walk reads and copies beyond it. The A-MSDU layout is chosen by the sender, which makes the difference between the last subframe and a shorter earlier one remotely selectable. Reaching this requires TDLS support in firmware and the TDLS ethertype on the subframe.  The other caller, mwifiex_process_rx_packet(), is correct: it passes a pointer and a length that describe the same region of the RX buffer.  Pass rx_skb-\u003elen, the length of the subframe actually being parsed.",
  "id": "DEBIAN-CVE-2026-74488",
  "modified": "2026-09-19T21:47:30.911474790Z",
  "published": "2026-08-15T13:17:53.690Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74488"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-74488"
  ]
}