CVE-2025-40052 (GCVE-0-2025-40052)
Vulnerability from cvelistv5
Published
2025-10-28 11:48
Modified
2025-10-28 11:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix crypto buffers in non-linear memory The crypto API, through the scatterlist API, expects input buffers to be in linear memory. We handle this with the cifs_sg_set_buf() helper that converts vmalloc'd memory to their corresponding pages. However, when we allocate our aead_request buffer (@creq in smb2ops.c::crypt_message()), we do so with kvzalloc(), which possibly puts aead_request->__ctx in vmalloc area. AEAD algorithm then uses ->__ctx for its private/internal data and operations, and uses sg_set_buf() for such data on a few places. This works fine as long as @creq falls into kmalloc zone (small requests) or vmalloc'd memory is still within linear range. Tasks' stacks are vmalloc'd by default (CONFIG_VMAP_STACK=y), so too many tasks will increment the base stacks' addresses to a point where virt_addr_valid(buf) will fail (BUG() in sg_set_buf()) when that happens. In practice: too many parallel reads and writes on an encrypted mount will trigger this bug. To fix this, always alloc @creq with kmalloc() instead. Also drop the @sensitive_size variable/arguments since kfree_sensitive() doesn't need it. Backtrace: [ 945.272081] ------------[ cut here ]------------ [ 945.272774] kernel BUG at include/linux/scatterlist.h:209! [ 945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [ 945.274412] CPU: 7 UID: 0 PID: 56 Comm: kworker/u33:0 Kdump: loaded Not tainted 6.15.0-lku-11779-g8e9d6efccdd7-dirty #1 PREEMPT(voluntary) [ 945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014 [ 945.276877] Workqueue: writeback wb_workfn (flush-cifs-2) [ 945.277457] RIP: 0010:crypto_gcm_init_common+0x1f9/0x220 [ 945.278018] Code: b0 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 c0 00 00 00 80 48 2b 05 5c 58 e5 00 e9 58 ff ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 04 24 01 00 00 00 48 8b [ 945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246 [ 945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030 [ 945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070 [ 945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000 [ 945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070 [ 945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010 [ 945.284407] FS: 0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000 [ 945.285262] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0 [ 945.286683] Call Trace: [ 945.286952] <TASK> [ 945.287184] ? crypt_message+0x33f/0xad0 [cifs] [ 945.287719] crypto_gcm_encrypt+0x36/0xe0 [ 945.288152] crypt_message+0x54a/0xad0 [cifs] [ 945.288724] smb3_init_transform_rq+0x277/0x300 [cifs] [ 945.289300] smb_send_rqst+0xa3/0x160 [cifs] [ 945.289944] cifs_call_async+0x178/0x340 [cifs] [ 945.290514] ? __pfx_smb2_writev_callback+0x10/0x10 [cifs] [ 945.291177] smb2_async_writev+0x3e3/0x670 [cifs] [ 945.291759] ? find_held_lock+0x32/0x90 [ 945.292212] ? netfs_advance_write+0xf2/0x310 [ 945.292723] netfs_advance_write+0xf2/0x310 [ 945.293210] netfs_write_folio+0x346/0xcc0 [ 945.293689] ? __pfx__raw_spin_unlock_irq+0x10/0x10 [ 945.294250] netfs_writepages+0x117/0x460 [ 945.294724] do_writepages+0xbe/0x170 [ 945.295152] ? find_held_lock+0x32/0x90 [ 945.295600] ? kvm_sched_clock_read+0x11/0x20 [ 945.296103] __writeback_single_inode+0x56/0x4b0 [ 945.296643] writeback_sb_inodes+0x229/0x550 [ 945.297140] __writeback_inodes_wb+0x4c/0xe0 [ 945.297642] wb_writeback+0x2f1/0x3f0 [ 945.298069] wb_workfn+0x300/0x490 [ 945.298472] process_one_work+0x1fe/0x590 [ 945.298949] worker_thread+0x1ce/0x3c0 [ 945.299397] ? __pfx_worker_thread+0x10/0x10 [ 945.299900] kthr ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: d08089f649a0cfb2099c8551ac47eef0cc23fdf2
Version: d08089f649a0cfb2099c8551ac47eef0cc23fdf2
Version: d08089f649a0cfb2099c8551ac47eef0cc23fdf2
Version: d08089f649a0cfb2099c8551ac47eef0cc23fdf2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ba905a567105dde21cdb8e6d3a87110fa434b393",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "7a8a8c15468f0c99685e9964451feffd1a3cc859",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "4a61b68abd2788db0364c9a0b6a39f1699fea440",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            },
            {
              "lessThan": "998a67b954680f26f3734040aeeed08642d49721",
              "status": "affected",
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.112",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc1",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix crypto buffers in non-linear memory\n\nThe crypto API, through the scatterlist API, expects input buffers to be\nin linear memory.  We handle this with the cifs_sg_set_buf() helper\nthat converts vmalloc\u0027d memory to their corresponding pages.\n\nHowever, when we allocate our aead_request buffer (@creq in\nsmb2ops.c::crypt_message()), we do so with kvzalloc(), which possibly\nputs aead_request-\u003e__ctx in vmalloc area.\n\nAEAD algorithm then uses -\u003e__ctx for its private/internal data and\noperations, and uses sg_set_buf() for such data on a few places.\n\nThis works fine as long as @creq falls into kmalloc zone (small\nrequests) or vmalloc\u0027d memory is still within linear range.\n\nTasks\u0027 stacks are vmalloc\u0027d by default (CONFIG_VMAP_STACK=y), so too\nmany tasks will increment the base stacks\u0027 addresses to a point where\nvirt_addr_valid(buf) will fail (BUG() in sg_set_buf()) when that\nhappens.\n\nIn practice: too many parallel reads and writes on an encrypted mount\nwill trigger this bug.\n\nTo fix this, always alloc @creq with kmalloc() instead.\nAlso drop the @sensitive_size variable/arguments since\nkfree_sensitive() doesn\u0027t need it.\n\nBacktrace:\n\n[  945.272081] ------------[ cut here ]------------\n[  945.272774] kernel BUG at include/linux/scatterlist.h:209!\n[  945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[  945.274412] CPU: 7 UID: 0 PID: 56 Comm: kworker/u33:0 Kdump: loaded Not tainted 6.15.0-lku-11779-g8e9d6efccdd7-dirty #1 PREEMPT(voluntary)\n[  945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014\n[  945.276877] Workqueue: writeback wb_workfn (flush-cifs-2)\n[  945.277457] RIP: 0010:crypto_gcm_init_common+0x1f9/0x220\n[  945.278018] Code: b0 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 c0 00 00 00 80 48 2b 05 5c 58 e5 00 e9 58 ff ff ff \u003c0f\u003e 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 04 24 01 00 00 00 48 8b\n[  945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246\n[  945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030\n[  945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070\n[  945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000\n[  945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070\n[  945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010\n[  945.284407] FS:  0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000\n[  945.285262] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0\n[  945.286683] Call Trace:\n[  945.286952]  \u003cTASK\u003e\n[  945.287184]  ? crypt_message+0x33f/0xad0 [cifs]\n[  945.287719]  crypto_gcm_encrypt+0x36/0xe0\n[  945.288152]  crypt_message+0x54a/0xad0 [cifs]\n[  945.288724]  smb3_init_transform_rq+0x277/0x300 [cifs]\n[  945.289300]  smb_send_rqst+0xa3/0x160 [cifs]\n[  945.289944]  cifs_call_async+0x178/0x340 [cifs]\n[  945.290514]  ? __pfx_smb2_writev_callback+0x10/0x10 [cifs]\n[  945.291177]  smb2_async_writev+0x3e3/0x670 [cifs]\n[  945.291759]  ? find_held_lock+0x32/0x90\n[  945.292212]  ? netfs_advance_write+0xf2/0x310\n[  945.292723]  netfs_advance_write+0xf2/0x310\n[  945.293210]  netfs_write_folio+0x346/0xcc0\n[  945.293689]  ? __pfx__raw_spin_unlock_irq+0x10/0x10\n[  945.294250]  netfs_writepages+0x117/0x460\n[  945.294724]  do_writepages+0xbe/0x170\n[  945.295152]  ? find_held_lock+0x32/0x90\n[  945.295600]  ? kvm_sched_clock_read+0x11/0x20\n[  945.296103]  __writeback_single_inode+0x56/0x4b0\n[  945.296643]  writeback_sb_inodes+0x229/0x550\n[  945.297140]  __writeback_inodes_wb+0x4c/0xe0\n[  945.297642]  wb_writeback+0x2f1/0x3f0\n[  945.298069]  wb_workfn+0x300/0x490\n[  945.298472]  process_one_work+0x1fe/0x590\n[  945.298949]  worker_thread+0x1ce/0x3c0\n[  945.299397]  ? __pfx_worker_thread+0x10/0x10\n[  945.299900]  kthr\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-28T11:48:27.854Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ba905a567105dde21cdb8e6d3a87110fa434b393"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a8a8c15468f0c99685e9964451feffd1a3cc859"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a61b68abd2788db0364c9a0b6a39f1699fea440"
        },
        {
          "url": "https://git.kernel.org/stable/c/998a67b954680f26f3734040aeeed08642d49721"
        }
      ],
      "title": "smb: client: fix crypto buffers in non-linear memory",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40052",
    "datePublished": "2025-10-28T11:48:27.854Z",
    "dateReserved": "2025-04-16T07:20:57.157Z",
    "dateUpdated": "2025-10-28T11:48:27.854Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40052\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T12:15:39.383\",\"lastModified\":\"2025-10-30T15:05:32.197\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: fix crypto buffers in non-linear memory\\n\\nThe crypto API, through the scatterlist API, expects input buffers to be\\nin linear memory.  We handle this with the cifs_sg_set_buf() helper\\nthat converts vmalloc\u0027d memory to their corresponding pages.\\n\\nHowever, when we allocate our aead_request buffer (@creq in\\nsmb2ops.c::crypt_message()), we do so with kvzalloc(), which possibly\\nputs aead_request-\u003e__ctx in vmalloc area.\\n\\nAEAD algorithm then uses -\u003e__ctx for its private/internal data and\\noperations, and uses sg_set_buf() for such data on a few places.\\n\\nThis works fine as long as @creq falls into kmalloc zone (small\\nrequests) or vmalloc\u0027d memory is still within linear range.\\n\\nTasks\u0027 stacks are vmalloc\u0027d by default (CONFIG_VMAP_STACK=y), so too\\nmany tasks will increment the base stacks\u0027 addresses to a point where\\nvirt_addr_valid(buf) will fail (BUG() in sg_set_buf()) when that\\nhappens.\\n\\nIn practice: too many parallel reads and writes on an encrypted mount\\nwill trigger this bug.\\n\\nTo fix this, always alloc @creq with kmalloc() instead.\\nAlso drop the @sensitive_size variable/arguments since\\nkfree_sensitive() doesn\u0027t need it.\\n\\nBacktrace:\\n\\n[  945.272081] ------------[ cut here ]------------\\n[  945.272774] kernel BUG at include/linux/scatterlist.h:209!\\n[  945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\\n[  945.274412] CPU: 7 UID: 0 PID: 56 Comm: kworker/u33:0 Kdump: loaded Not tainted 6.15.0-lku-11779-g8e9d6efccdd7-dirty #1 PREEMPT(voluntary)\\n[  945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014\\n[  945.276877] Workqueue: writeback wb_workfn (flush-cifs-2)\\n[  945.277457] RIP: 0010:crypto_gcm_init_common+0x1f9/0x220\\n[  945.278018] Code: b0 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 c0 00 00 00 80 48 2b 05 5c 58 e5 00 e9 58 ff ff ff \u003c0f\u003e 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 04 24 01 00 00 00 48 8b\\n[  945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246\\n[  945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030\\n[  945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070\\n[  945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000\\n[  945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070\\n[  945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010\\n[  945.284407] FS:  0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000\\n[  945.285262] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[  945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0\\n[  945.286683] Call Trace:\\n[  945.286952]  \u003cTASK\u003e\\n[  945.287184]  ? crypt_message+0x33f/0xad0 [cifs]\\n[  945.287719]  crypto_gcm_encrypt+0x36/0xe0\\n[  945.288152]  crypt_message+0x54a/0xad0 [cifs]\\n[  945.288724]  smb3_init_transform_rq+0x277/0x300 [cifs]\\n[  945.289300]  smb_send_rqst+0xa3/0x160 [cifs]\\n[  945.289944]  cifs_call_async+0x178/0x340 [cifs]\\n[  945.290514]  ? __pfx_smb2_writev_callback+0x10/0x10 [cifs]\\n[  945.291177]  smb2_async_writev+0x3e3/0x670 [cifs]\\n[  945.291759]  ? find_held_lock+0x32/0x90\\n[  945.292212]  ? netfs_advance_write+0xf2/0x310\\n[  945.292723]  netfs_advance_write+0xf2/0x310\\n[  945.293210]  netfs_write_folio+0x346/0xcc0\\n[  945.293689]  ? __pfx__raw_spin_unlock_irq+0x10/0x10\\n[  945.294250]  netfs_writepages+0x117/0x460\\n[  945.294724]  do_writepages+0xbe/0x170\\n[  945.295152]  ? find_held_lock+0x32/0x90\\n[  945.295600]  ? kvm_sched_clock_read+0x11/0x20\\n[  945.296103]  __writeback_single_inode+0x56/0x4b0\\n[  945.296643]  writeback_sb_inodes+0x229/0x550\\n[  945.297140]  __writeback_inodes_wb+0x4c/0xe0\\n[  945.297642]  wb_writeback+0x2f1/0x3f0\\n[  945.298069]  wb_workfn+0x300/0x490\\n[  945.298472]  process_one_work+0x1fe/0x590\\n[  945.298949]  worker_thread+0x1ce/0x3c0\\n[  945.299397]  ? __pfx_worker_thread+0x10/0x10\\n[  945.299900]  kthr\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4a61b68abd2788db0364c9a0b6a39f1699fea440\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7a8a8c15468f0c99685e9964451feffd1a3cc859\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/998a67b954680f26f3734040aeeed08642d49721\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba905a567105dde21cdb8e6d3a87110fa434b393\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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