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              "value": "AV:N - Both vulnerable comparisons process data from remote SCTP peers \u2014 COOKIE ECHO chunks in `sctp_sf_do_5_1D_ce()`/`sctp_unpack_cookie()` and AUTH chunks in `sctp_sf_authenticate()` \u2014 delivered over IPv4/IPv6 from any routable host. No local access or network adjacency is required.\nAC:H - Exploitation requires statistically extracting nanosecond-scale timing deltas from the early-exit `memcmp` across network jitter and target CPU load, and on 64-bit architectures with `HAVE_EFFICIENT_UNALIGNED_ACCESS` the loop leaks only 8-byte-granular prefixes \u2014 conditions the attacker cannot influence. The bad-signature path is a silent `sctp_sf_pdiscard()`, so no direct request/response oracle exists.\nPR:N - The COOKIE ECHO path is reached pre-authentication on any listening SCTP socket, with the attacker supplying both the cookie contents and the matching verification tag, so no credentials or prior association state are needed. Cookie HMAC signing is enabled by default via `CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5`.\nUI:N - The vulnerable comparisons execute automatically in the SCTP receive path for every COOKIE ECHO or AUTH chunk that reaches a listening endpoint or established association. No action by any local user or administrator is involved.\nS:U - The forged-MAC consequences \u2014 spoofed association establishment, out-of-bounds reads, and softirq hangs \u2014 all occur inside the kernel of the targeted host. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - A forged cookie MAC yields a fully attacker-controlled `struct sctp_cookie` whose unvalidated `raw_addr_list_len` drives an unbounded walk in `sctp_raw_to_bind_addrs()`, reading far past the skb. A forged SCTP-AUTH HMAC additionally allows ASCONF Add-IP injection to redirect an established association\u0027s data stream to the attacker.\nI:H - Recovering the MAC constitutes a complete bypass of SCTP\u0027s state-cookie and SCTP-AUTH authentication, letting an off-path attacker forge cookies to establish spoofed associations and inject arbitrary authenticated chunks into existing ones. The attacker-controlled cookie is copied wholesale into the new association via `memcpy(\u0026retval-\u003ec, bear_cookie, ...)` and fed to `sctp_process_init()`.\nA:H - With the cookie MAC forged, `sctp_raw_to_bind_addrs()` at this commit has no bounds checks \u2014 a zero-length address parameter makes `addrs_len -= len` never progress, producing an infinite loop in softirq context, while an oversized length causes an OOB read that can oops the kernel. Forged AUTH chunks also permit tearing down established associations."
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              "value": "AV:N - The tls_write_space callback is triggered by a remote TCP peer sending ACKs, which causes tcp_data_snd_check \u2192 tcp_check_space \u2192 tcp_new_space \u2192 sk-\u003esk_write_space (tls_write_space). Any server using kTLS (nginx, HAProxy, NFS with TLS) is reachable over the network.\nAC:L - The attacker controls both sides of the race: they send TCP ACKs to trigger tls_write_space and initiate disconnect to trigger the close path. With repeated connection attempts and ACK flooding, the race window is reliably winnable.\nPR:N - No authentication or privileges are needed to establish a TCP connection and send ACKs to a kTLS-enabled server. The race is triggered during normal TCP processing before any application-level authentication occurs.\nUI:N - No user interaction is needed. The attacker connects to the server, sends ACKs, and disconnects to trigger the race. The server processes this automatically.\nS:U - The vulnerability results in kernel-level use-after-free within the same security authority (kernel space). There is no crossing of a virtualization or sandbox boundary.\nC:H - This is a use-after-free where the freed tls_sw_context_tx (freed via immediate kfree, not kfree_rcu) can be reallocated with attacker-influenced data. The UAF gives read access to reallocated memory contents, enabling arbitrary kernel memory disclosure.\nI:H - The UAF on the tls_sw_context_tx structure enables heap spraying to control the freed object\u0027s contents. The tx_work_handler then calls tls_tx_records through corrupted context pointers, enabling control flow hijacking and arbitrary code execution.\nA:H - The use-after-free on the embedded delayed_work struct causes kernel crashes when the workqueue attempts to execute the freed work item, resulting in kernel panic or oops."
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              "value": "AV:L - The vulnerable path is reached through local packet transmission and RTNETLINK tc/qdisc operations against TEQL; remote packets alone cannot create/delete the qdiscs needed to trigger the race.\nAC:L - The race is between attacker-driven sender workers and attacker-driven qdisc teardown/re-add operations, so both sides are controllable and repeatable.\nPR:L - Creating/deleting tc qdiscs requires CAP_NET_ADMIN, but tc/qdisc paths are reachable with namespace-scoped capabilities via user/network namespaces in plausible deployments.\nUI:N - No victim action is required once the attacker has local access and the needed namespace/network privileges.\nS:U - The impact is within the kernel and does not cross a distinct security authority such as a VM or device isolation boundary.\nC:H - The bug is a double-free/use-after-free of attacker-influenced skb memory, which can potentially be shaped into kernel heap disclosure primitives.\nI:H - The double-free/use-after-free corrupts kernel heap state and is plausibly exploitable for arbitrary write or control-flow corruption.\nA:H - KASAN reports confirm crashes in skb freeing, and repeated triggering can panic or otherwise take down the kernel."
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_events.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
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            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()\n\nThe kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8\nbytes via memset without checking the buffer size parameter. This allows\nunprivileged userspace to trigger an out-of bounds kernel memory write\nby passing a small buffer, leading to  potential privilege\nescalation."
        }
      ],
      "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 vulnerable path is reached through local `/dev/kfd` ioctls, specifically allocating a KFD GPU memory object and passing its handle as `event_page_offset` to `AMDKFD_IOC_CREATE_EVENT`. There is no network, adjacent, or physical packet/device-input path.\nAC:L - The attacker controls the supplied event-page handle and can allocate a buffer smaller than `KFD_SIGNAL_EVENT_LIMIT * 8`, making the fixed-size `memset` out-of-bounds deterministic. No race or external condition is required.\nPR:L - The path is available to unprivileged userspace with access to KFD/AMDGPU device nodes, and the relevant ioctls have no capability flag or `capable()` gate. This is low privilege, not real administrator privilege.\nUI:N - Once a local attacker can execute code and open the device, exploitation only requires issuing ioctls. No victim user action is needed.\nS:U - The corruption occurs inside the kernel driver and impacts the same kernel security authority. This is standard local kernel compromise/DoS, not a cross-scope escape such as guest-to-host or IOMMU boundary bypass.\nC:H - The bug is an out-of-bounds kernel write into memory adjacent to a kernel-mapped GPU buffer, and kernel memory corruption can reasonably be leveraged to disclose sensitive kernel memory. Following the higher-severity rule for memory corruption, confidentiality impact is High.\nI:H - The vulnerable `memset` writes attacker-triggered data beyond the allocated object, giving a kernel memory corruption primitive. Out-of-bounds writes are scored as High integrity impact because they can plausibly be developed into privilege escalation or control-flow/data corruption.\nA:H - The out-of-bounds kernel write can corrupt adjacent kernel memory and readily crash or destabilize the kernel even without full exploitation. Kernel oops, panic, or persistent GPU/kernel failure is a High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:33.242Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d"
        },
        {
          "url": "https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940"
        },
        {
          "url": "https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d"
        }
      ],
      "title": "drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()",
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        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43206",
    "datePublished": "2026-05-06T11:28:10.937Z",
    "dateReserved": "2026-05-01T14:12:55.993Z",
    "dateUpdated": "2026-08-05T12:26:33.242Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}