CVE-2022-49928 (GCVE-0-2022-49928)
Vulnerability from cvelistv5
Published
2025-05-01 14:11
Modified
2026-08-05 08:56
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed There is a null-ptr-deref when xps sysfs alloc failed: BUG: KASAN: null-ptr-deref in sysfs_do_create_link_sd+0x40/0xd0 Read of size 8 at addr 0000000000000030 by task gssproxy/457 CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 kasan_report+0xa3/0x120 sysfs_do_create_link_sd+0x40/0xd0 rpc_sysfs_client_setup+0x161/0x1b0 rpc_new_client+0x3fc/0x6e0 rpc_create_xprt+0x71/0x220 rpc_create+0x1d4/0x350 gssp_rpc_create+0xc3/0x160 set_gssp_clnt+0xbc/0x140 write_gssp+0x116/0x1a0 proc_reg_write+0xd6/0x130 vfs_write+0x177/0x690 ksys_write+0xb9/0x150 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 When the xprt_switch sysfs alloc failed, should not add xprt and switch sysfs to it, otherwise, maybe null-ptr-deref; also initialize the 'xps_sysfs' to NULL to avoid oops when destroy it.
References
Impacted products
Vendor Product Version
Linux Linux Version: baea99445dd4675a834e8a5987d2f368adb62e6c
Version: baea99445dd4675a834e8a5987d2f368adb62e6c
Version: baea99445dd4675a834e8a5987d2f368adb62e6c
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49928",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T14:56:32.147376Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-476",
                "description": "CWE-476 NULL Pointer Dereference",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T14:56:34.636Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d59722d088a9d86ce6d9d39979e5d1d669d249f7",
              "status": "affected",
              "version": "baea99445dd4675a834e8a5987d2f368adb62e6c",
              "versionType": "git"
            },
            {
              "lessThan": "7b189b0aa8dab14b49c31c65af8a982e96e25b62",
              "status": "affected",
              "version": "baea99445dd4675a834e8a5987d2f368adb62e6c",
              "versionType": "git"
            },
            {
              "lessThan": "cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a",
              "status": "affected",
              "version": "baea99445dd4675a834e8a5987d2f368adb62e6c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.78",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.8",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix null-ptr-deref when xps sysfs alloc failed\n\nThere is a null-ptr-deref when xps sysfs alloc failed:\n  BUG: KASAN: null-ptr-deref in sysfs_do_create_link_sd+0x40/0xd0\n  Read of size 8 at addr 0000000000000030 by task gssproxy/457\n\n  CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x34/0x44\n   kasan_report+0xa3/0x120\n   sysfs_do_create_link_sd+0x40/0xd0\n   rpc_sysfs_client_setup+0x161/0x1b0\n   rpc_new_client+0x3fc/0x6e0\n   rpc_create_xprt+0x71/0x220\n   rpc_create+0x1d4/0x350\n   gssp_rpc_create+0xc3/0x160\n   set_gssp_clnt+0xbc/0x140\n   write_gssp+0x116/0x1a0\n   proc_reg_write+0xd6/0x130\n   vfs_write+0x177/0x690\n   ksys_write+0xb9/0x150\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nWhen the xprt_switch sysfs alloc failed, should not add xprt and\nswitch sysfs to it, otherwise, maybe null-ptr-deref; also initialize\nthe \u0027xps_sysfs\u0027 to NULL to avoid oops when destroy it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - On an NFS server, a remote NFSv4 peer can drive SETCLIENTID_CONFIRM/CREATE_SESSION into nfsd4_probe_callback \u2192 setup_callback_client \u2192 rpc_create \u2192 xprt_switch_alloc/rpc_sysfs_*_setup, so the vulnerable SUNRPC sysfs path is reached from network RPC with no local access; lockd NLM\u2192nsm_create similarly triggers rpc_create from remote lock traffic.\nAC:L - The attacker fully controls NFSv4 client/session establishment that allocates RPC clients and can induce memory pressure so rpc_sysfs_xprt_switch_alloc fails, after which the NULL/uninit xps_sysfs dereference is deterministic with no attacker-uncontrollable race.\nPR:N - SETCLIENTID/CREATE_SESSION are ALLOWED_WITHOUT_FH and commonly accepted with AUTH_UNIX (or equivalent weak RPC auth) on nfsd, so an unauthenticated remote peer needs no host privileges or valid local credentials to reach the callback rpc_create path.\nUI:N - The attacker sends the NFSv4 client-setup compounds themselves; no victim action such as mounting a filesystem or opening a file is required beyond nfsd already listening.\nS:U - Impact is a host-kernel oops/panic in SUNRPC sysfs setup under the same OS authority, with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - This is a pure null-pointer dereference in sysfs_create_link_nowarn/sysfs_do_create_link_sd on a NULL xps_sysfs kobject (KASAN read at 0x30), with no OOB read or disclosure primitive.\nI:N - The fault is a NULL/invalid pointer read during sysfs link creation with no memory write, type confusion, or control-flow hijack beyond the ensuing oops.\nA:H - The confirmed KASAN null-ptr-deref in rpc_sysfs_client_setup causes a kernel oops/panic that a remote peer can trigger whenever xprt-switch sysfs allocation fails, fully denying host availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:43.886Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d59722d088a9d86ce6d9d39979e5d1d669d249f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b189b0aa8dab14b49c31c65af8a982e96e25b62"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a"
        }
      ],
      "title": "SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49928",
    "datePublished": "2025-05-01T14:11:06.068Z",
    "dateReserved": "2025-05-01T14:05:17.253Z",
    "dateUpdated": "2026-08-05T08:56:43.886Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49928\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T14:56:32.147376Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:17:42.732Z\"}}], \"cna\": {\"title\": \"SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - On an NFS server, a remote NFSv4 peer can drive SETCLIENTID_CONFIRM/CREATE_SESSION into nfsd4_probe_callback \\u2192 setup_callback_client \\u2192 rpc_create \\u2192 xprt_switch_alloc/rpc_sysfs_*_setup, so the vulnerable SUNRPC sysfs path is reached from network RPC with no local access; lockd NLM\\u2192nsm_create similarly triggers rpc_create from remote lock traffic.\\nAC:L - The attacker fully controls NFSv4 client/session establishment that allocates RPC clients and can induce memory pressure so rpc_sysfs_xprt_switch_alloc fails, after which the NULL/uninit xps_sysfs dereference is deterministic with no attacker-uncontrollable race.\\nPR:N - SETCLIENTID/CREATE_SESSION are ALLOWED_WITHOUT_FH and commonly accepted with AUTH_UNIX (or equivalent weak RPC auth) on nfsd, so an unauthenticated remote peer needs no host privileges or valid local credentials to reach the callback rpc_create path.\\nUI:N - The attacker sends the NFSv4 client-setup compounds themselves; no victim action such as mounting a filesystem or opening a file is required beyond nfsd already listening.\\nS:U - Impact is a host-kernel oops/panic in SUNRPC sysfs setup under the same OS authority, with no VM escape, IOMMU bypass, or other cross-boundary effect.\\nC:N - This is a pure null-pointer dereference in sysfs_create_link_nowarn/sysfs_do_create_link_sd on a NULL xps_sysfs kobject (KASAN read at 0x30), with no OOB read or disclosure primitive.\\nI:N - The fault is a NULL/invalid pointer read during sysfs link creation with no memory write, type confusion, or control-flow hijack beyond the ensuing oops.\\nA:H - The confirmed KASAN null-ptr-deref in rpc_sysfs_client_setup causes a kernel oops/panic that a remote peer can trigger whenever xprt-switch sysfs allocation fails, fully denying host availability.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"baea99445dd4675a834e8a5987d2f368adb62e6c\", \"lessThan\": \"d59722d088a9d86ce6d9d39979e5d1d669d249f7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"baea99445dd4675a834e8a5987d2f368adb62e6c\", \"lessThan\": \"7b189b0aa8dab14b49c31c65af8a982e96e25b62\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"baea99445dd4675a834e8a5987d2f368adb62e6c\", \"lessThan\": \"cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sunrpc/sysfs.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sunrpc/sysfs.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d59722d088a9d86ce6d9d39979e5d1d669d249f7\"}, {\"url\": \"https://git.kernel.org/stable/c/7b189b0aa8dab14b49c31c65af8a982e96e25b62\"}, {\"url\": \"https://git.kernel.org/stable/c/cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nSUNRPC: Fix null-ptr-deref when xps sysfs alloc failed\\n\\nThere is a null-ptr-deref when xps sysfs alloc failed:\\n  BUG: KASAN: null-ptr-deref in sysfs_do_create_link_sd+0x40/0xd0\\n  Read of size 8 at addr 0000000000000030 by task gssproxy/457\\n\\n  CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl+0x34/0x44\\n   kasan_report+0xa3/0x120\\n   sysfs_do_create_link_sd+0x40/0xd0\\n   rpc_sysfs_client_setup+0x161/0x1b0\\n   rpc_new_client+0x3fc/0x6e0\\n   rpc_create_xprt+0x71/0x220\\n   rpc_create+0x1d4/0x350\\n   gssp_rpc_create+0xc3/0x160\\n   set_gssp_clnt+0xbc/0x140\\n   write_gssp+0x116/0x1a0\\n   proc_reg_write+0xd6/0x130\\n   vfs_write+0x177/0x690\\n   ksys_write+0xb9/0x150\\n   do_syscall_64+0x35/0x80\\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\\n\\nWhen the xprt_switch sysfs alloc failed, should not add xprt and\\nswitch sysfs to it, otherwise, maybe null-ptr-deref; also initialize\\nthe \u0027xps_sysfs\u0027 to NULL to avoid oops when destroy it.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.78\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.8\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"5.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:56:43.886Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49928\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:56:43.886Z\", \"dateReserved\": \"2025-05-01T14:05:17.253Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-05-01T14:11:06.068Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.