CVE-2025-37894 (GCVE-0-2025-37894)
Vulnerability from cvelistv5
Published
2025-05-20 15:21
Modified
2026-08-05 11:58
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: use sock_gen_put() when sk_state is TCP_TIME_WAIT It is possible for a pointer of type struct inet_timewait_sock to be returned from the functions __inet_lookup_established() and __inet6_lookup_established(). This can cause a crash when the returned pointer is of type struct inet_timewait_sock and sock_put() is called on it. The following is a crash call stack that shows sk->sk_wmem_alloc being accessed in sk_free() during the call to sock_put() on a struct inet_timewait_sock pointer. To avoid this issue, use sock_gen_put() instead of sock_put() when sk->sk_state is TCP_TIME_WAIT. mrdump.ko ipanic() + 120 vmlinux notifier_call_chain(nr_to_call=-1, nr_calls=0) + 132 vmlinux atomic_notifier_call_chain(val=0) + 56 vmlinux panic() + 344 vmlinux add_taint() + 164 vmlinux end_report() + 136 vmlinux kasan_report(size=0) + 236 vmlinux report_tag_fault() + 16 vmlinux do_tag_recovery() + 16 vmlinux __do_kernel_fault() + 88 vmlinux do_bad_area() + 28 vmlinux do_tag_check_fault() + 60 vmlinux do_mem_abort() + 80 vmlinux el1_abort() + 56 vmlinux el1h_64_sync_handler() + 124 vmlinux > 0xFFFFFFC080011294() vmlinux __lse_atomic_fetch_add_release(v=0xF2FFFF82A896087C) vmlinux __lse_atomic_fetch_sub_release(v=0xF2FFFF82A896087C) vmlinux arch_atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C) + 8 vmlinux raw_atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C) + 8 vmlinux atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C) + 8 vmlinux __refcount_sub_and_test(i=1, r=0xF2FFFF82A896087C, oldp=0) + 8 vmlinux __refcount_dec_and_test(r=0xF2FFFF82A896087C, oldp=0) + 8 vmlinux refcount_dec_and_test(r=0xF2FFFF82A896087C) + 8 vmlinux sk_free(sk=0xF2FFFF82A8960700) + 28 vmlinux sock_put() + 48 vmlinux tcp6_check_fraglist_gro() + 236 vmlinux tcp6_gro_receive() + 624 vmlinux ipv6_gro_receive() + 912 vmlinux dev_gro_receive() + 1116 vmlinux napi_gro_receive() + 196 ccmni.ko ccmni_rx_callback() + 208 ccmni.ko ccmni_queue_recv_skb() + 388 ccci_dpmaif.ko dpmaif_rxq_push_thread() + 1088 vmlinux kthread() + 268 vmlinux 0xFFFFFFC08001F30C()
References
Impacted products
Vendor Product Version
Linux Linux Version: c9d1d23e5239f41700be69133a5769ac5ebc88a8
Version: c9d1d23e5239f41700be69133a5769ac5ebc88a8
Version: c9d1d23e5239f41700be69133a5769ac5ebc88a8
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_offload.c",
            "net/ipv6/tcpv6_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c0dba059b118b5206e755042b15b49368a388898",
              "status": "affected",
              "version": "c9d1d23e5239f41700be69133a5769ac5ebc88a8",
              "versionType": "git"
            },
            {
              "lessThan": "786650e644c5b1c063921799ca203c0b8670d79a",
              "status": "affected",
              "version": "c9d1d23e5239f41700be69133a5769ac5ebc88a8",
              "versionType": "git"
            },
            {
              "lessThan": "f920436a44295ca791ebb6dae3f4190142eec703",
              "status": "affected",
              "version": "c9d1d23e5239f41700be69133a5769ac5ebc88a8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_offload.c",
            "net/ipv6/tcpv6_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.28",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.28",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.6",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: use sock_gen_put() when sk_state is TCP_TIME_WAIT\n\nIt is possible for a pointer of type struct inet_timewait_sock to be\nreturned from the functions __inet_lookup_established() and\n__inet6_lookup_established(). This can cause a crash when the\nreturned pointer is of type struct inet_timewait_sock and\nsock_put() is called on it. The following is a crash call stack that\nshows sk-\u003esk_wmem_alloc being accessed in sk_free() during the call to\nsock_put() on a struct inet_timewait_sock pointer. To avoid this issue,\nuse sock_gen_put() instead of sock_put() when sk-\u003esk_state\nis TCP_TIME_WAIT.\n\nmrdump.ko        ipanic() + 120\nvmlinux          notifier_call_chain(nr_to_call=-1, nr_calls=0) + 132\nvmlinux          atomic_notifier_call_chain(val=0) + 56\nvmlinux          panic() + 344\nvmlinux          add_taint() + 164\nvmlinux          end_report() + 136\nvmlinux          kasan_report(size=0) + 236\nvmlinux          report_tag_fault() + 16\nvmlinux          do_tag_recovery() + 16\nvmlinux          __do_kernel_fault() + 88\nvmlinux          do_bad_area() + 28\nvmlinux          do_tag_check_fault() + 60\nvmlinux          do_mem_abort() + 80\nvmlinux          el1_abort() + 56\nvmlinux          el1h_64_sync_handler() + 124\nvmlinux        \u003e 0xFFFFFFC080011294()\nvmlinux          __lse_atomic_fetch_add_release(v=0xF2FFFF82A896087C)\nvmlinux          __lse_atomic_fetch_sub_release(v=0xF2FFFF82A896087C)\nvmlinux          arch_atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C)\n+ 8\nvmlinux          raw_atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C)\n+ 8\nvmlinux          atomic_fetch_sub_release(i=1, v=0xF2FFFF82A896087C) + 8\nvmlinux          __refcount_sub_and_test(i=1, r=0xF2FFFF82A896087C,\noldp=0) + 8\nvmlinux          __refcount_dec_and_test(r=0xF2FFFF82A896087C, oldp=0) + 8\nvmlinux          refcount_dec_and_test(r=0xF2FFFF82A896087C) + 8\nvmlinux          sk_free(sk=0xF2FFFF82A8960700) + 28\nvmlinux          sock_put() + 48\nvmlinux          tcp6_check_fraglist_gro() + 236\nvmlinux          tcp6_gro_receive() + 624\nvmlinux          ipv6_gro_receive() + 912\nvmlinux          dev_gro_receive() + 1116\nvmlinux          napi_gro_receive() + 196\nccmni.ko         ccmni_rx_callback() + 208\nccmni.ko         ccmni_queue_recv_skb() + 388\nccci_dpmaif.ko   dpmaif_rxq_push_thread() + 1088\nvmlinux          kthread() + 268\nvmlinux          0xFFFFFFC08001F30C()"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code executes in the GRO packet-receive softirq path (`napi_gro_receive` \u2192 `ipv4/ipv6_gro_receive` \u2192 `tcp4/6_gro_receive` \u2192 `tcp4/6_check_fraglist_gro`), triggered purely by TCP segments arriving from the network. The reported real-world crash occurred on a modem/WAN interface receiving internet traffic.\nAC:L - The attacker controls both sides of the race \u2014 it creates the TIME_WAIT sockets by opening and closing connections, deterministically tears them down on demand by sending an RST or out-of-window SYN for the same 4-tuple (`TCP_TW_RST`/`TCP_TW_SYN` \u2192 `inet_twsk_deschedule_put()`), and concurrently floods matching segments that drive the GRO lookup on other RX queues, so the final `sock_put()` reliably lands on a dying twsk. It can also groom the dedicated `tw_sock_TCP` slab to place a chosen victim object next to the out-of-bounds decrement.\nPR:N - No credentials or privileges of any kind are needed \u2014 GRO processing happens in softirq on raw received packets long before any socket-level authentication or delivery, and creating TIME_WAIT state only requires connecting to any reachable TCP port or emitting traffic through the box.\nUI:N - Exploitation is fully driven by attacker-transmitted packets; no local user action, mount, or file access is required.\nS:U - The out-of-bounds decrement, the potential indirect call, and the resulting corruption are all confined to the kernel\u0027s own memory and security authority, with no crossing into a hypervisor, IOMMU, or other security scope.\nC:H - The mistyped free reads far past the 264-byte timewait object \u2014 `sk_prot_creator` at +600 and `sk_destruct` at +736 \u2014 and the corrupted neighbouring `hlist_nulls` pointers turn subsequent ehash walks into reads of attacker-influenced addresses, giving a path to arbitrary kernel memory disclosure.\nI:H - `sk_free()` performs an atomic 32-bit read-modify-write 116 bytes out of bounds into an adjacent live `tcp_timewait_sock`, corrupting its hash-list pointers, which are later written through by `sk_nulls_del_node_init_rcu()`; if the OOB word reads 1, `__sk_destruct()` additionally makes an indirect call through a function pointer sourced from out-of-bounds heap data, yielding a control-flow hijack primitive.\nA:H - The bug was reported as a confirmed kernel panic (KASAN/MTE tag-check fault in `sk_free()` \u2192 `panic()`), and a remote unauthenticated attacker can retrigger the out-of-bounds refcount decrement repeatedly, crashing the machine at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:58:09.042Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c0dba059b118b5206e755042b15b49368a388898"
        },
        {
          "url": "https://git.kernel.org/stable/c/786650e644c5b1c063921799ca203c0b8670d79a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f920436a44295ca791ebb6dae3f4190142eec703"
        }
      ],
      "title": "net: use sock_gen_put() when sk_state is TCP_TIME_WAIT",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37894",
    "datePublished": "2025-05-20T15:21:31.283Z",
    "dateReserved": "2025-04-16T04:51:23.964Z",
    "dateUpdated": "2026-08-05T11:58:09.042Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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