CVE-2022-50341 (GCVE-0-2022-50341)
Vulnerability from cvelistv5
Published
2025-09-16 16:11
Modified
2025-09-16 16:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix oops during encryption When running xfstests against Azure the following oops occurred on an arm64 system Unable to handle kernel write to read-only memory at virtual address ffff0001221cf000 Mem abort info: ESR = 0x9600004f EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x0f: level 3 permission fault Data abort info: ISV = 0, ISS = 0x0000004f CM = 0, WnR = 1 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000294f3000 [ffff0001221cf000] pgd=18000001ffff8003, p4d=18000001ffff8003, pud=18000001ff82e003, pmd=18000001ff71d003, pte=00600001221cf787 Internal error: Oops: 9600004f [#1] PREEMPT SMP ... pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) pc : __memcpy+0x40/0x230 lr : scatterwalk_copychunks+0xe0/0x200 sp : ffff800014e92de0 x29: ffff800014e92de0 x28: ffff000114f9de80 x27: 0000000000000008 x26: 0000000000000008 x25: ffff800014e92e78 x24: 0000000000000008 x23: 0000000000000001 x22: 0000040000000000 x21: ffff000000000000 x20: 0000000000000001 x19: ffff0001037c4488 x18: 0000000000000014 x17: 235e1c0d6efa9661 x16: a435f9576b6edd6c x15: 0000000000000058 x14: 0000000000000001 x13: 0000000000000008 x12: ffff000114f2e590 x11: ffffffffffffffff x10: 0000040000000000 x9 : ffff8000105c3580 x8 : 2e9413b10000001a x7 : 534b4410fb86b005 x6 : 534b4410fb86b005 x5 : ffff0001221cf008 x4 : ffff0001037c4490 x3 : 0000000000000001 x2 : 0000000000000008 x1 : ffff0001037c4488 x0 : ffff0001221cf000 Call trace: __memcpy+0x40/0x230 scatterwalk_map_and_copy+0x98/0x100 crypto_ccm_encrypt+0x150/0x180 crypto_aead_encrypt+0x2c/0x40 crypt_message+0x750/0x880 smb3_init_transform_rq+0x298/0x340 smb_send_rqst.part.11+0xd8/0x180 smb_send_rqst+0x3c/0x100 compound_send_recv+0x534/0xbc0 smb2_query_info_compound+0x32c/0x440 smb2_set_ea+0x438/0x4c0 cifs_xattr_set+0x5d4/0x7c0 This is because in scatterwalk_copychunks(), we attempted to write to a buffer (@sign) that was allocated in the stack (vmalloc area) by crypt_message() and thus accessing its remaining 8 (x2) bytes ended up crossing a page boundary. To simply fix it, we could just pass @sign kmalloc'd from crypt_message() and then we're done. Luckily, we don't seem to pass any other vmalloc'd buffers in smb_rqst::rq_iov... Instead, let's map the correct pages and offsets from vmalloc buffers as well in cifs_sg_set_buf() and then avoiding such oopses.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf0543b93740916ee91956f9a63da6fc0d79daaa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8d16a54842d609fd4a3ed2d81d4333d6329aa94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8e2861cc3258dbe407d01ea8c59bb5a53132301
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7f291e14dde32a07b1f0aa06921d28f875a7b54
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe6ea044c4f05706cb71040055b1c70c6c8275e0
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/cifsglob.h",
            "fs/cifs/cifsproto.h",
            "fs/cifs/misc.c",
            "fs/cifs/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "e8e2861cc3258dbe407d01ea8c59bb5a53132301",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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            },
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              "status": "affected",
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            },
            {
              "lessThan": "e8d16a54842d609fd4a3ed2d81d4333d6329aa94",
              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/cifs/cifsglob.h",
            "fs/cifs/cifsproto.h",
            "fs/cifs/misc.c",
            "fs/cifs/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.229",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.15.87",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.0.16",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.1.1",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix oops during encryption\n\nWhen running xfstests against Azure the following oops occurred on an\narm64 system\n\n  Unable to handle kernel write to read-only memory at virtual address\n  ffff0001221cf000\n  Mem abort info:\n    ESR = 0x9600004f\n    EC = 0x25: DABT (current EL), IL = 32 bits\n    SET = 0, FnV = 0\n    EA = 0, S1PTW = 0\n    FSC = 0x0f: level 3 permission fault\n  Data abort info:\n    ISV = 0, ISS = 0x0000004f\n    CM = 0, WnR = 1\n  swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000294f3000\n  [ffff0001221cf000] pgd=18000001ffff8003, p4d=18000001ffff8003,\n  pud=18000001ff82e003, pmd=18000001ff71d003, pte=00600001221cf787\n  Internal error: Oops: 9600004f [#1] PREEMPT SMP\n  ...\n  pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)\n  pc : __memcpy+0x40/0x230\n  lr : scatterwalk_copychunks+0xe0/0x200\n  sp : ffff800014e92de0\n  x29: ffff800014e92de0 x28: ffff000114f9de80 x27: 0000000000000008\n  x26: 0000000000000008 x25: ffff800014e92e78 x24: 0000000000000008\n  x23: 0000000000000001 x22: 0000040000000000 x21: ffff000000000000\n  x20: 0000000000000001 x19: ffff0001037c4488 x18: 0000000000000014\n  x17: 235e1c0d6efa9661 x16: a435f9576b6edd6c x15: 0000000000000058\n  x14: 0000000000000001 x13: 0000000000000008 x12: ffff000114f2e590\n  x11: ffffffffffffffff x10: 0000040000000000 x9 : ffff8000105c3580\n  x8 : 2e9413b10000001a x7 : 534b4410fb86b005 x6 : 534b4410fb86b005\n  x5 : ffff0001221cf008 x4 : ffff0001037c4490 x3 : 0000000000000001\n  x2 : 0000000000000008 x1 : ffff0001037c4488 x0 : ffff0001221cf000\n  Call trace:\n   __memcpy+0x40/0x230\n   scatterwalk_map_and_copy+0x98/0x100\n   crypto_ccm_encrypt+0x150/0x180\n   crypto_aead_encrypt+0x2c/0x40\n   crypt_message+0x750/0x880\n   smb3_init_transform_rq+0x298/0x340\n   smb_send_rqst.part.11+0xd8/0x180\n   smb_send_rqst+0x3c/0x100\n   compound_send_recv+0x534/0xbc0\n   smb2_query_info_compound+0x32c/0x440\n   smb2_set_ea+0x438/0x4c0\n   cifs_xattr_set+0x5d4/0x7c0\n\nThis is because in scatterwalk_copychunks(), we attempted to write to\na buffer (@sign) that was allocated in the stack (vmalloc area) by\ncrypt_message() and thus accessing its remaining 8 (x2) bytes ended up\ncrossing a page boundary.\n\nTo simply fix it, we could just pass @sign kmalloc\u0027d from\ncrypt_message() and then we\u0027re done.  Luckily, we don\u0027t seem to pass\nany other vmalloc\u0027d buffers in smb_rqst::rq_iov...\n\nInstead, let\u0027s map the correct pages and offsets from vmalloc buffers\nas well in cifs_sg_set_buf() and then avoiding such oopses."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T16:11:32.923Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e8e2861cc3258dbe407d01ea8c59bb5a53132301"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe6ea044c4f05706cb71040055b1c70c6c8275e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf0543b93740916ee91956f9a63da6fc0d79daaa"
        },
        {
          "url": "https://git.kernel.org/stable/c/a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8d16a54842d609fd4a3ed2d81d4333d6329aa94"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7f291e14dde32a07b1f0aa06921d28f875a7b54"
        }
      ],
      "title": "cifs: fix oops during encryption",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50341",
    "datePublished": "2025-09-16T16:11:20.838Z",
    "dateReserved": "2025-09-16T16:03:27.881Z",
    "dateUpdated": "2025-09-16T16:11:32.923Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50341\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T17:15:33.660\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncifs: fix oops during encryption\\n\\nWhen running xfstests against Azure the following oops occurred on an\\narm64 system\\n\\n  Unable to handle kernel write to read-only memory at virtual address\\n  ffff0001221cf000\\n  Mem abort info:\\n    ESR = 0x9600004f\\n    EC = 0x25: DABT (current EL), IL = 32 bits\\n    SET = 0, FnV = 0\\n    EA = 0, S1PTW = 0\\n    FSC = 0x0f: level 3 permission fault\\n  Data abort info:\\n    ISV = 0, ISS = 0x0000004f\\n    CM = 0, WnR = 1\\n  swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000294f3000\\n  [ffff0001221cf000] pgd=18000001ffff8003, p4d=18000001ffff8003,\\n  pud=18000001ff82e003, pmd=18000001ff71d003, pte=00600001221cf787\\n  Internal error: Oops: 9600004f [#1] PREEMPT SMP\\n  ...\\n  pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)\\n  pc : __memcpy+0x40/0x230\\n  lr : scatterwalk_copychunks+0xe0/0x200\\n  sp : ffff800014e92de0\\n  x29: ffff800014e92de0 x28: ffff000114f9de80 x27: 0000000000000008\\n  x26: 0000000000000008 x25: ffff800014e92e78 x24: 0000000000000008\\n  x23: 0000000000000001 x22: 0000040000000000 x21: ffff000000000000\\n  x20: 0000000000000001 x19: ffff0001037c4488 x18: 0000000000000014\\n  x17: 235e1c0d6efa9661 x16: a435f9576b6edd6c x15: 0000000000000058\\n  x14: 0000000000000001 x13: 0000000000000008 x12: ffff000114f2e590\\n  x11: ffffffffffffffff x10: 0000040000000000 x9 : ffff8000105c3580\\n  x8 : 2e9413b10000001a x7 : 534b4410fb86b005 x6 : 534b4410fb86b005\\n  x5 : ffff0001221cf008 x4 : ffff0001037c4490 x3 : 0000000000000001\\n  x2 : 0000000000000008 x1 : ffff0001037c4488 x0 : ffff0001221cf000\\n  Call trace:\\n   __memcpy+0x40/0x230\\n   scatterwalk_map_and_copy+0x98/0x100\\n   crypto_ccm_encrypt+0x150/0x180\\n   crypto_aead_encrypt+0x2c/0x40\\n   crypt_message+0x750/0x880\\n   smb3_init_transform_rq+0x298/0x340\\n   smb_send_rqst.part.11+0xd8/0x180\\n   smb_send_rqst+0x3c/0x100\\n   compound_send_recv+0x534/0xbc0\\n   smb2_query_info_compound+0x32c/0x440\\n   smb2_set_ea+0x438/0x4c0\\n   cifs_xattr_set+0x5d4/0x7c0\\n\\nThis is because in scatterwalk_copychunks(), we attempted to write to\\na buffer (@sign) that was allocated in the stack (vmalloc area) by\\ncrypt_message() and thus accessing its remaining 8 (x2) bytes ended up\\ncrossing a page boundary.\\n\\nTo simply fix it, we could just pass @sign kmalloc\u0027d from\\ncrypt_message() and then we\u0027re done.  Luckily, we don\u0027t seem to pass\\nany other vmalloc\u0027d buffers in smb_rqst::rq_iov...\\n\\nInstead, let\u0027s map the correct pages and offsets from vmalloc buffers\\nas well in cifs_sg_set_buf() and then avoiding such oopses.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/a13e51760703f71c25d5fc1f4a62dfa4b0cc80e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf0543b93740916ee91956f9a63da6fc0d79daaa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8d16a54842d609fd4a3ed2d81d4333d6329aa94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8e2861cc3258dbe407d01ea8c59bb5a53132301\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7f291e14dde32a07b1f0aa06921d28f875a7b54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe6ea044c4f05706cb71040055b1c70c6c8275e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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