CVE-2022-49810 (GCVE-0-2022-49810)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-05-11 19:07
VLAI
Title
netfs: Fix missing xas_retry() calls in xarray iteration
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix missing xas_retry() calls in xarray iteration netfslib has a number of places in which it performs iteration of an xarray whilst being under the RCU read lock. It *should* call xas_retry() as the first thing inside of the loop and do "continue" if it returns true in case the xarray walker passed out a special value indicating that the walk needs to be redone from the root[*]. Fix this by adding the missing retry checks. [*] I wonder if this should be done inside xas_find(), xas_next_node() and suchlike, but I'm told that's not an simple change to effect. This can cause an oops like that below. Note the faulting address - this is an internal value (|0x2) returned from xarray. BUG: kernel NULL pointer dereference, address: 0000000000000402 ... RIP: 0010:netfs_rreq_unlock+0xef/0x380 [netfs] ... Call Trace: netfs_rreq_assess+0xa6/0x240 [netfs] netfs_readpage+0x173/0x3b0 [netfs] ? init_wait_var_entry+0x50/0x50 filemap_read_page+0x33/0xf0 filemap_get_pages+0x2f2/0x3f0 filemap_read+0xaa/0x320 ? do_filp_open+0xb2/0x150 ? rmqueue+0x3be/0xe10 ceph_read_iter+0x1fe/0x680 [ceph] ? new_sync_read+0x115/0x1a0 new_sync_read+0x115/0x1a0 vfs_read+0xf3/0x180 ksys_read+0x5f/0xe0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae Changes: ======== ver #2) - Changed an unsigned int to a size_t to reduce the likelihood of an overflow as per Willy's suggestion. - Added an additional patch to fix the maths.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3d3c95046742e4eebaa4b891b0b01cbbed94ebbd , < b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d (git)
Affected: 3d3c95046742e4eebaa4b891b0b01cbbed94ebbd , < 7e043a80b5dae5c2d2cf84031501de7827fd6c00 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/netfs/buffered_read.c",
            "fs/netfs/io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d",
              "status": "affected",
              "version": "3d3c95046742e4eebaa4b891b0b01cbbed94ebbd",
              "versionType": "git"
            },
            {
              "lessThan": "7e043a80b5dae5c2d2cf84031501de7827fd6c00",
              "status": "affected",
              "version": "3d3c95046742e4eebaa4b891b0b01cbbed94ebbd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/netfs/buffered_read.c",
            "fs/netfs/io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.10",
              "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": "6.0.10",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing xas_retry() calls in xarray iteration\n\nnetfslib has a number of places in which it performs iteration of an xarray\nwhilst being under the RCU read lock.  It *should* call xas_retry() as the\nfirst thing inside of the loop and do \"continue\" if it returns true in case\nthe xarray walker passed out a special value indicating that the walk needs\nto be redone from the root[*].\n\nFix this by adding the missing retry checks.\n\n[*] I wonder if this should be done inside xas_find(), xas_next_node() and\n    suchlike, but I\u0027m told that\u0027s not an simple change to effect.\n\nThis can cause an oops like that below.  Note the faulting address - this\nis an internal value (|0x2) returned from xarray.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000402\n...\nRIP: 0010:netfs_rreq_unlock+0xef/0x380 [netfs]\n...\nCall Trace:\n netfs_rreq_assess+0xa6/0x240 [netfs]\n netfs_readpage+0x173/0x3b0 [netfs]\n ? init_wait_var_entry+0x50/0x50\n filemap_read_page+0x33/0xf0\n filemap_get_pages+0x2f2/0x3f0\n filemap_read+0xaa/0x320\n ? do_filp_open+0xb2/0x150\n ? rmqueue+0x3be/0xe10\n ceph_read_iter+0x1fe/0x680 [ceph]\n ? new_sync_read+0x115/0x1a0\n new_sync_read+0x115/0x1a0\n vfs_read+0xf3/0x180\n ksys_read+0x5f/0xe0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nChanges:\n========\nver #2)\n - Changed an unsigned int to a size_t to reduce the likelihood of an\n   overflow as per Willy\u0027s suggestion.\n - Added an additional patch to fix the maths."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:07:13.661Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e043a80b5dae5c2d2cf84031501de7827fd6c00"
        }
      ],
      "title": "netfs: Fix missing xas_retry() calls in xarray iteration",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49810",
    "datePublished": "2025-05-01T14:09:35.470Z",
    "dateReserved": "2025-05-01T14:05:17.226Z",
    "dateUpdated": "2026-05-11T19:07:13.661Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-49810",
      "date": "2026-10-01",
      "epss": "0.0017",
      "percentile": "0.05755"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/netfs/buffered_read.c",
                  "fs/netfs/io.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d",
                    "status": "affected",
                    "version": "3d3c95046742e4eebaa4b891b0b01cbbed94ebbd",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7e043a80b5dae5c2d2cf84031501de7827fd6c00",
                    "status": "affected",
                    "version": "3d3c95046742e4eebaa4b891b0b01cbbed94ebbd",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/netfs/buffered_read.c",
                  "fs/netfs/io.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.13"
                  },
                  {
                    "lessThan": "5.13",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.0.*",
                    "status": "unaffected",
                    "version": "6.0.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "2FF408D3-ACA7-41DC-8339-17AAAF160282",
                    "versionEndExcluding": "6.0.10",
                    "versionStartIncluding": "5.13",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*",
                    "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*",
                    "matchCriteriaId": "35B26BE4-43A6-4A36-A7F6-5B3F572D9186",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing xas_retry() calls in xarray iteration\n\nnetfslib has a number of places in which it performs iteration of an xarray\nwhilst being under the RCU read lock.  It *should* call xas_retry() as the\nfirst thing inside of the loop and do \"continue\" if it returns true in case\nthe xarray walker passed out a special value indicating that the walk needs\nto be redone from the root[*].\n\nFix this by adding the missing retry checks.\n\n[*] I wonder if this should be done inside xas_find(), xas_next_node() and\n    suchlike, but I\u0027m told that\u0027s not an simple change to effect.\n\nThis can cause an oops like that below.  Note the faulting address - this\nis an internal value (|0x2) returned from xarray.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000402\n...\nRIP: 0010:netfs_rreq_unlock+0xef/0x380 [netfs]\n...\nCall Trace:\n netfs_rreq_assess+0xa6/0x240 [netfs]\n netfs_readpage+0x173/0x3b0 [netfs]\n ? init_wait_var_entry+0x50/0x50\n filemap_read_page+0x33/0xf0\n filemap_get_pages+0x2f2/0x3f0\n filemap_read+0xaa/0x320\n ? do_filp_open+0xb2/0x150\n ? rmqueue+0x3be/0xe10\n ceph_read_iter+0x1fe/0x680 [ceph]\n ? new_sync_read+0x115/0x1a0\n new_sync_read+0x115/0x1a0\n vfs_read+0xf3/0x180\n ksys_read+0x5f/0xe0\n do_syscall_64+0x38/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nChanges:\n========\nver #2)\n - Changed an unsigned int to a size_t to reduce the likelihood of an\n   overflow as per Willy\u0027s suggestion.\n - Added an additional patch to fix the maths."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs: Se corrigen las llamadas xas_retry() faltantes en la iteraci\u00f3n de un xarray. netfslib realiza la iteraci\u00f3n de un xarray en varios lugares bajo el bloqueo de lectura de la RCU. *Deber\u00eda* llamar a xas_retry() como primer paso dentro del bucle y ejecutar \"continue\" si devuelve verdadero en caso de que el rastreador de xarrays haya pasado un valor especial que indique que el recorrido debe rehacerse desde la ra\u00edz. [*] Se puede solucionar a\u00f1adiendo las comprobaciones de reintento faltantes. [*] Me pregunto si esto deber\u00eda hacerse dentro de xas_find(), xas_next_node() y similares, pero me han dicho que no es un cambio sencillo de implementar. Esto puede causar un error como el que se muestra a continuaci\u00f3n. Observe la direcci\u00f3n del error: se trata de un valor interno (|0x2) devuelto por xarray. ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000402 ... RIP: 0010:netfs_rreq_unlock+0xef/0x380 [netfs] ... Seguimiento de llamadas: netfs_rreq_assess+0xa6/0x240 [netfs] netfs_readpage+0x173/0x3b0 [netfs] ? init_wait_var_entry+0x50/0x50 filemap_read_page+0x33/0xf0 filemap_get_pages+0x2f2/0x3f0 filemap_read+0xaa/0x320 ? do_filp_open+0xb2/0x150 ? rmqueue+0x3be/0xe10 ceph_read_iter+0x1fe/0x680 [ceph] ? new_sync_read+0x115/0x1a0 new_sync_read+0x115/0x1a0 vfs_read+0xf3/0x180 ksys_read+0x5f/0xe0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae Changes: ======== ver #2) - Se cambi\u00f3 un int sin signo a un size_t para reducir la probabilidad de un desbordamiento seg\u00fan la sugerencia de Willy. - Se agreg\u00f3 un parche adicional para corregir las matem\u00e1ticas."
          }
        ],
        "id": "CVE-2022-49810",
        "lastModified": "2026-06-17T05:19:12.043",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-01T15:16:04.347",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7e043a80b5dae5c2d2cf84031501de7827fd6c00"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b2cc07a76f1eb12de3b22caf5fdbf856a7bef16d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:18:10+00:00",
      "cve": "CVE-2022-49810",
      "id": "CVE-2022-49810",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfs: Fix missing xas_retry() calls in xarray iteration",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49810.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-05T17:06:28Z",
      "cve": "CVE-2022-49810",
      "id": "CVE-2022-49810",
      "initial_release_date": "2025-05-09T04:55:22Z",
      "product_status:known_affected": "339",
      "product_status:known_not_affected": "386",
      "product_status:recommended": "214",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49810",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49810.json",
      "version": "42"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.



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.