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CVE-2025-38734 (GCVE-0-2025-38734)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2026-08-05 12:04
VLAI
Title
net/smc: fix UAF on smcsk after smc_listen_out()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: fix UAF on smcsk after smc_listen_out() BPF CI testing report a UAF issue: [ 16.446633] BUG: kernel NULL pointer dereference, address: 000000000000003 0 [ 16.447134] #PF: supervisor read access in kernel mod e [ 16.447516] #PF: error_code(0x0000) - not-present pag e [ 16.447878] PGD 0 P4D 0 [ 16.448063] Oops: Oops: 0000 [#1] PREEMPT SMP NOPT I [ 16.448409] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Tainted: G OE 6.13.0-rc3-g89e8a75fda73-dirty #4 2 [ 16.449124] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODUL E [ 16.449502] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/201 4 [ 16.450201] Workqueue: smc_hs_wq smc_listen_wor k [ 16.450531] RIP: 0010:smc_listen_work+0xc02/0x159 0 [ 16.452158] RSP: 0018:ffffb5ab40053d98 EFLAGS: 0001024 6 [ 16.452526] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000030 0 [ 16.452994] RDX: 0000000000000280 RSI: 00003513840053f0 RDI: 000000000000000 0 [ 16.453492] RBP: ffffa097808e3800 R08: ffffa09782dba1e0 R09: 000000000000000 5 [ 16.453987] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0978274640 0 [ 16.454497] R13: 0000000000000000 R14: 0000000000000000 R15: ffffa09782d4092 0 [ 16.454996] FS: 0000000000000000(0000) GS:ffffa097bbc00000(0000) knlGS:000000000000000 0 [ 16.455557] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003 3 [ 16.455961] CR2: 0000000000000030 CR3: 0000000102788004 CR4: 0000000000770ef 0 [ 16.456459] PKRU: 5555555 4 [ 16.456654] Call Trace : [ 16.456832] <TASK > [ 16.456989] ? __die+0x23/0x7 0 [ 16.457215] ? page_fault_oops+0x180/0x4c 0 [ 16.457508] ? __lock_acquire+0x3e6/0x249 0 [ 16.457801] ? exc_page_fault+0x68/0x20 0 [ 16.458080] ? asm_exc_page_fault+0x26/0x3 0 [ 16.458389] ? smc_listen_work+0xc02/0x159 0 [ 16.458689] ? smc_listen_work+0xc02/0x159 0 [ 16.458987] ? lock_is_held_type+0x8f/0x10 0 [ 16.459284] process_one_work+0x1ea/0x6d 0 [ 16.459570] worker_thread+0x1c3/0x38 0 [ 16.459839] ? __pfx_worker_thread+0x10/0x1 0 [ 16.460144] kthread+0xe0/0x11 0 [ 16.460372] ? __pfx_kthread+0x10/0x1 0 [ 16.460640] ret_from_fork+0x31/0x5 0 [ 16.460896] ? __pfx_kthread+0x10/0x1 0 [ 16.461166] ret_from_fork_asm+0x1a/0x3 0 [ 16.461453] </TASK > [ 16.461616] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE) ] [ 16.462134] CR2: 000000000000003 0 [ 16.462380] ---[ end trace 0000000000000000 ]--- [ 16.462710] RIP: 0010:smc_listen_work+0xc02/0x1590 The direct cause of this issue is that after smc_listen_out_connected(), newclcsock->sk may be NULL since it will releases the smcsk. Therefore, if the application closes the socket immediately after accept, newclcsock->sk can be NULL. A possible execution order could be as follows: smc_listen_work | userspace ----------------------------------------------------------------- lock_sock(sk) | smc_listen_out_connected() | | \- smc_listen_out | | | \- release_sock | | |- sk->sk_data_ready() | | fd = accept(); | close(fd); | \- socket->sk = NULL; /* newclcsock->sk is NULL now */ SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk)) Since smc_listen_out_connected() will not fail, simply swapping the order of the code can easily fix this issue.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8 , < 070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f (git)
Affected: 3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8 , < 2e765ba0ee0eae35688b443e97108308a716773e (git)
Affected: 3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8 , < 85545f1525f9fa9bf44fec77ba011024f15da342 (git)
Affected: 3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8 , < d9cef55ed49117bd63695446fb84b4b91815c0b4 (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/af_smc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f",
              "status": "affected",
              "version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8",
              "versionType": "git"
            },
            {
              "lessThan": "2e765ba0ee0eae35688b443e97108308a716773e",
              "status": "affected",
              "version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8",
              "versionType": "git"
            },
            {
              "lessThan": "85545f1525f9fa9bf44fec77ba011024f15da342",
              "status": "affected",
              "version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8",
              "versionType": "git"
            },
            {
              "lessThan": "d9cef55ed49117bd63695446fb84b4b91815c0b4",
              "status": "affected",
              "version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/af_smc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.103",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.44",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.4",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix UAF on smcsk after smc_listen_out()\n\nBPF CI testing report a UAF issue:\n\n  [   16.446633] BUG: kernel NULL pointer dereference, address: 000000000000003  0\n  [   16.447134] #PF: supervisor read access in kernel mod  e\n  [   16.447516] #PF: error_code(0x0000) - not-present pag  e\n  [   16.447878] PGD 0 P4D   0\n  [   16.448063] Oops: Oops: 0000 [#1] PREEMPT SMP NOPT  I\n  [   16.448409] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Tainted: G           OE      6.13.0-rc3-g89e8a75fda73-dirty #4  2\n  [   16.449124] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODUL  E\n  [   16.449502] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/201  4\n  [   16.450201] Workqueue: smc_hs_wq smc_listen_wor  k\n  [   16.450531] RIP: 0010:smc_listen_work+0xc02/0x159  0\n  [   16.452158] RSP: 0018:ffffb5ab40053d98 EFLAGS: 0001024  6\n  [   16.452526] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000030  0\n  [   16.452994] RDX: 0000000000000280 RSI: 00003513840053f0 RDI: 000000000000000  0\n  [   16.453492] RBP: ffffa097808e3800 R08: ffffa09782dba1e0 R09: 000000000000000  5\n  [   16.453987] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0978274640  0\n  [   16.454497] R13: 0000000000000000 R14: 0000000000000000 R15: ffffa09782d4092  0\n  [   16.454996] FS:  0000000000000000(0000) GS:ffffa097bbc00000(0000) knlGS:000000000000000  0\n  [   16.455557] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003  3\n  [   16.455961] CR2: 0000000000000030 CR3: 0000000102788004 CR4: 0000000000770ef  0\n  [   16.456459] PKRU: 5555555  4\n  [   16.456654] Call Trace  :\n  [   16.456832]  \u003cTASK  \u003e\n  [   16.456989]  ? __die+0x23/0x7  0\n  [   16.457215]  ? page_fault_oops+0x180/0x4c  0\n  [   16.457508]  ? __lock_acquire+0x3e6/0x249  0\n  [   16.457801]  ? exc_page_fault+0x68/0x20  0\n  [   16.458080]  ? asm_exc_page_fault+0x26/0x3  0\n  [   16.458389]  ? smc_listen_work+0xc02/0x159  0\n  [   16.458689]  ? smc_listen_work+0xc02/0x159  0\n  [   16.458987]  ? lock_is_held_type+0x8f/0x10  0\n  [   16.459284]  process_one_work+0x1ea/0x6d  0\n  [   16.459570]  worker_thread+0x1c3/0x38  0\n  [   16.459839]  ? __pfx_worker_thread+0x10/0x1  0\n  [   16.460144]  kthread+0xe0/0x11  0\n  [   16.460372]  ? __pfx_kthread+0x10/0x1  0\n  [   16.460640]  ret_from_fork+0x31/0x5  0\n  [   16.460896]  ? __pfx_kthread+0x10/0x1  0\n  [   16.461166]  ret_from_fork_asm+0x1a/0x3  0\n  [   16.461453]  \u003c/TASK  \u003e\n  [   16.461616] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE)  ]\n  [   16.462134] CR2: 000000000000003  0\n  [   16.462380] ---[ end trace 0000000000000000 ]---\n  [   16.462710] RIP: 0010:smc_listen_work+0xc02/0x1590\n\nThe direct cause of this issue is that after smc_listen_out_connected(),\nnewclcsock-\u003esk may be NULL since it will releases the smcsk. Therefore,\nif the application closes the socket immediately after accept,\nnewclcsock-\u003esk can be NULL. A possible execution order could be as\nfollows:\n\nsmc_listen_work                                 | userspace\n-----------------------------------------------------------------\nlock_sock(sk)                                   |\nsmc_listen_out_connected()                      |\n| \\- smc_listen_out                             |\n|    | \\- release_sock                          |\n     | |- sk-\u003esk_data_ready()                   |\n                                                | fd = accept();\n                                                | close(fd);\n                                                |  \\- socket-\u003esk = NULL;\n/* newclcsock-\u003esk is NULL now */\nSMC_STAT_SERV_SUCC_INC(sock_net(newclcsock-\u003esk))\n\nSince smc_listen_out_connected() will not fail, simply swapping the order\nof the code can easily fix this issue."
        }
      ],
      "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 `smc_listen_work()` handler is scheduled and driven entirely by an inbound TCP connection carrying the SMC experimental option and the subsequent CLC handshake messages from a remote peer, making this a net/ stack bug reachable via received packets.\nAC:L - The attacker can open unlimited concurrent SMC connections and retry the race indefinitely, and in the loopback-ism/local-peer scenario controls both sides outright (the connect and the accept()+close()); the race was reproduced reliably enough to be caught by CI.\nPR:N - The SMC CLC handshake performs no authentication whatsoever \u2014 the connection is accepted and the vulnerable worker runs before any credential check, so an unauthenticated remote peer reaches the code.\nUI:N - No deliberate victim action is required; the server application\u0027s normal accept()/close() sequence is what races the worker, and the attacker triggers the handshake itself.\nS:U - The use-after-free and resulting corruption are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed `struct socket`, and the stale value is dereferenced as a `struct sock *` and chased through `sk_net` \u2014 with the freed slab reclaimed under attacker influence this yields arbitrary kernel-memory reads.\nI:H - The pointer read from the freed object is used as the base for `this_cpu_inc()` in SMC_STAT_SERV_SUCC_INC, turning the UAF into an attacker-influenceable kernel write primitive suitable for heap grooming and control-flow hijacking.\nA:H - The bug reproducibly oopses the smc_hs_wq kworker with a supervisor page fault (confirmed in the commit\u0027s trace), and a remote attacker can trigger it repeatedly to panic or destabilize the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:04:24.867Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e765ba0ee0eae35688b443e97108308a716773e"
        },
        {
          "url": "https://git.kernel.org/stable/c/85545f1525f9fa9bf44fec77ba011024f15da342"
        },
        {
          "url": "https://git.kernel.org/stable/c/d9cef55ed49117bd63695446fb84b4b91815c0b4"
        }
      ],
      "title": "net/smc: fix UAF on smcsk after smc_listen_out()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38734",
    "datePublished": "2025-09-05T17:20:34.126Z",
    "dateReserved": "2025-04-16T04:51:24.034Z",
    "dateUpdated": "2026-08-05T12:04:24.867Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-38734",
      "date": "2026-09-16",
      "epss": "0.00451",
      "percentile": "0.38319"
    },
    "microsoft_vex": {
      "current_release_date": "2026-03-31T15:04:23.000Z",
      "cve": "CVE-2025-38734",
      "id": "msrc_CVE-2025-38734",
      "initial_release_date": "2025-09-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/smc: fix UAF on smcsk after smc_listen_out()",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38734.json",
      "version": "4"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38734\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:42.677\",\"lastModified\":\"2026-07-30T06:23:38.660\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/smc: fix UAF on smcsk after smc_listen_out()\\n\\nBPF CI testing report a UAF issue:\\n\\n  [   16.446633] BUG: kernel NULL pointer dereference, address: 000000000000003  0\\n  [   16.447134] #PF: supervisor read access in kernel mod  e\\n  [   16.447516] #PF: error_code(0x0000) - not-present pag  e\\n  [   16.447878] PGD 0 P4D   0\\n  [   16.448063] Oops: Oops: 0000 [#1] PREEMPT SMP NOPT  I\\n  [   16.448409] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Tainted: G           OE      6.13.0-rc3-g89e8a75fda73-dirty #4  2\\n  [   16.449124] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODUL  E\\n  [   16.449502] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/201  4\\n  [   16.450201] Workqueue: smc_hs_wq smc_listen_wor  k\\n  [   16.450531] RIP: 0010:smc_listen_work+0xc02/0x159  0\\n  [   16.452158] RSP: 0018:ffffb5ab40053d98 EFLAGS: 0001024  6\\n  [   16.452526] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000030  0\\n  [   16.452994] RDX: 0000000000000280 RSI: 00003513840053f0 RDI: 000000000000000  0\\n  [   16.453492] RBP: ffffa097808e3800 R08: ffffa09782dba1e0 R09: 000000000000000  5\\n  [   16.453987] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0978274640  0\\n  [   16.454497] R13: 0000000000000000 R14: 0000000000000000 R15: ffffa09782d4092  0\\n  [   16.454996] FS:  0000000000000000(0000) GS:ffffa097bbc00000(0000) knlGS:000000000000000  0\\n  [   16.455557] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003  3\\n  [   16.455961] CR2: 0000000000000030 CR3: 0000000102788004 CR4: 0000000000770ef  0\\n  [   16.456459] PKRU: 5555555  4\\n  [   16.456654] Call Trace  :\\n  [   16.456832]  \u003cTASK  \u003e\\n  [   16.456989]  ? __die+0x23/0x7  0\\n  [   16.457215]  ? page_fault_oops+0x180/0x4c  0\\n  [   16.457508]  ? __lock_acquire+0x3e6/0x249  0\\n  [   16.457801]  ? exc_page_fault+0x68/0x20  0\\n  [   16.458080]  ? asm_exc_page_fault+0x26/0x3  0\\n  [   16.458389]  ? smc_listen_work+0xc02/0x159  0\\n  [   16.458689]  ? smc_listen_work+0xc02/0x159  0\\n  [   16.458987]  ? lock_is_held_type+0x8f/0x10  0\\n  [   16.459284]  process_one_work+0x1ea/0x6d  0\\n  [   16.459570]  worker_thread+0x1c3/0x38  0\\n  [   16.459839]  ? __pfx_worker_thread+0x10/0x1  0\\n  [   16.460144]  kthread+0xe0/0x11  0\\n  [   16.460372]  ? __pfx_kthread+0x10/0x1  0\\n  [   16.460640]  ret_from_fork+0x31/0x5  0\\n  [   16.460896]  ? __pfx_kthread+0x10/0x1  0\\n  [   16.461166]  ret_from_fork_asm+0x1a/0x3  0\\n  [   16.461453]  \u003c/TASK  \u003e\\n  [   16.461616] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE)  ]\\n  [   16.462134] CR2: 000000000000003  0\\n  [   16.462380] ---[ end trace 0000000000000000 ]---\\n  [   16.462710] RIP: 0010:smc_listen_work+0xc02/0x1590\\n\\nThe direct cause of this issue is that after smc_listen_out_connected(),\\nnewclcsock-\u003esk may be NULL since it will releases the smcsk. Therefore,\\nif the application closes the socket immediately after accept,\\nnewclcsock-\u003esk can be NULL. A possible execution order could be as\\nfollows:\\n\\nsmc_listen_work                                 | userspace\\n-----------------------------------------------------------------\\nlock_sock(sk)                                   |\\nsmc_listen_out_connected()                      |\\n| \\\\- smc_listen_out                             |\\n|    | \\\\- release_sock                          |\\n     | |- sk-\u003esk_data_ready()                   |\\n                                                | fd = accept();\\n                                                | close(fd);\\n                                                |  \\\\- socket-\u003esk = NULL;\\n/* newclcsock-\u003esk is NULL now */\\nSMC_STAT_SERV_SUCC_INC(sock_net(newclcsock-\u003esk))\\n\\nSince smc_listen_out_connected() will not fail, simply swapping the order\\nof the code can easily fix this issue.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/smc/af_smc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8\",\"lessThan\":\"070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8\",\"lessThan\":\"2e765ba0ee0eae35688b443e97108308a716773e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8\",\"lessThan\":\"85545f1525f9fa9bf44fec77ba011024f15da342\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8\",\"lessThan\":\"d9cef55ed49117bd63695446fb84b4b91815c0b4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/smc/af_smc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.103\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.44\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.4\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.18\",\"versionEndExcluding\":\"6.6.103\",\"matchCriteriaId\":\"54CDC610-1E95-40F6-A755-81E1D6C4ABC8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.44\",\"matchCriteriaId\":\"12351F24-1133-4775-960C-F2B47E81298B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.4\",\"matchCriteriaId\":\"AFC28995-B8C3-4B68-8CB6-78E792B6629D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"327D22EF-390B-454C-BD31-2ED23C998A1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C730CD9A-D969-4A8E-9522-162AAF7C0EE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2e765ba0ee0eae35688b443e97108308a716773e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/85545f1525f9fa9bf44fec77ba011024f15da342\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d9cef55ed49117bd63695446fb84b4b91815c0b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:03:03+00:00",
      "cve": "CVE-2025-38734",
      "id": "CVE-2025-38734",
      "initial_release_date": "2025-09-05T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/smc: fix UAF on smcsk after smc_listen_out()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38734.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:58:58Z",
      "cve": "CVE-2025-38734",
      "id": "CVE-2025-38734",
      "initial_release_date": "2025-09-05T23:23:25Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "347",
      "product_status:known_not_affected": "262",
      "product_status:recommended": "670",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38734",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38734.json",
      "version": "51"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


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.