CVE-2022-48827

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The client as\n> a result indefinitely retries the request.\n\nThe Linux NFS client does not handle NFS?ERR_INVAL, even though all\nNFS specifications permit servers to return that status code for a\nREAD.\n\nInstead of NFS?ERR_INVAL, have out-of-range READ requests succeed\nand return a short result. Set the EOF flag in the result to prevent\nthe client from retrying the READ request. This behavior appears to\nbe consistent with Solaris NFS servers.\n\nNote that NFSv3 and NFSv4 use u64 offset values on the wire. These\nmust be converted to loff_t internally before use -- an implicit\ntype cast is not adequate for this purpose. Otherwise VFS checks\nagainst sb->s_maxbytes do not work properly."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in the in-kernel NFS server (nfsd3_proc_read / nfsd4_read) and is reached by processing NFSv3/v4 READ RPCs over the network (TCP/UDP 2049); a remote NFS client triggers it by reading near OFFSET_MAX.\nAC:L - An attacker who can write to an export on a filesystem that allows MAX_LFS_FILESIZE (e.g. XFS) can create a sparse file of size OFFSET_MAX and then read it; the loff_t overflow and NFSERR_INVAL response occur reliably with no race or other condition outside attacker control.\nPR:N - Typical nfsd deployments use AUTH_SYS/AUTH_NULL with IP-based exports, so a remote peer that can reach the export self-asserts credentials with no cryptographic authentication and can open/read (and create) files that exercise the READ path.\nUI:N - The attacker drives file creation and the triggering READ entirely via NFS RPCs; no separate action by a victim user or administrator on the server is required.\nS:U - Impact is confined to the NFS server and its Linux clients\u2019 use of that service within the same host/kernel authority; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:N - The defect only causes an out-of-range READ to fail with NFSERR_INVAL after VFS rejects the overflowing loff_t; there is no out-of-bounds read, UAF, or other information-disclosure primitive.\nI:N - There is no memory corruption, OOB write, or attacker-controlled modification of kernel or file data\u2014only a protocol error return for an overflowing offset/length pair.\nA:H - Linux NFS clients treat NFSERR_INVAL as non-fatal, drop the page without PageError, and indefinitely reissue the READ, hanging the reader and continuously hammering nfsd; infinite retry/hang is high availability 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a remote NFS client triggers it by reading near OFFSET_MAX.\nAC:L - An attacker who can write to an export on a filesystem that allows MAX_LFS_FILESIZE (e.g. XFS) can create a sparse file of size OFFSET_MAX and then read it; the loff_t overflow and NFSERR_INVAL response occur reliably with no race or other condition outside attacker control.\nPR:N - Typical nfsd deployments use AUTH_SYS/AUTH_NULL with IP-based exports, so a remote peer that can reach the export self-asserts credentials with no cryptographic authentication and can open/read (and create) files that exercise the READ path.\nUI:N - The attacker drives file creation and the triggering READ entirely via NFS RPCs; no separate action by a victim user or administrator on the server is required.\nS:U - Impact is confined to the NFS server and its Linux clients\u2019 use of that service within the same host/kernel authority; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:N - The defect only causes an out-of-range READ to fail with NFSERR_INVAL after VFS rejects the overflowing loff_t; there is no out-of-bounds read, UAF, or other information-disclosure primitive.\nI:N - There is no memory corruption, OOB write, or attacker-controlled modification of kernel or file data\u2014only a protocol error return for an overflowing offset/length pair.\nA:H - Linux NFS clients treat NFSERR_INVAL as non-fatal, drop the page without PageError, and indefinitely reissue the READ, hanging the reader and continuously hammering nfsd; infinite retry/hang is high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1726a39b0879acfb490b22dca643f26f4f907da9", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c6eff5c4277146a78b4fb8c9b668dd64542c41b0", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "44502aca8e02ab32d6b0eb52e006a5ec9402719b", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960", "versionType": "git"}], "programFiles": ["fs/nfsd/nfs3proc.c", "fs/nfsd/nfs4proc.c", "fs/nfsd/nfs4xdr.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.220", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.24", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16.10", "versionType": "semver", "lessThanOrEqual": "5.16.*"}, {"status": "unaffected", "version": "5.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfsd/nfs3proc.c", "fs/nfsd/nfs4proc.c", "fs/nfsd/nfs4xdr.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1726a39b0879acfb490b22dca643f26f4f907da9"}, {"url": "https://git.kernel.org/stable/c/c6eff5c4277146a78b4fb8c9b668dd64542c41b0"}, {"url": "https://git.kernel.org/stable/c/44502aca8e02ab32d6b0eb52e006a5ec9402719b"}, {"url": "https://git.kernel.org/stable/c/0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix the behavior of READ near OFFSET_MAX\n\nDan Aloni reports:\n> Due to commit 8cfb9015280d (\"NFS: Always provide aligned buffers to\n> the RPC read layers\") on the client, a read of 0xfff is aligned up\n> to server rsize of 0x1000.\n>\n> As a result, in a test where the server has a file of size\n> 0x7fffffffffffffff, and the client tries to read from the offset\n> 0x7ffffffffffff000, the read causes loff_t overflow in the server\n> and it returns an NFS code of EINVAL to the client. 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The client as\n> a result indefinitely retries the request.\n\nThe Linux NFS client does not handle NFS?ERR_INVAL, even though all\nNFS specifications permit servers to return that status code for a\nREAD.\n\nInstead of NFS?ERR_INVAL, have out-of-range READ requests succeed\nand return a short result. Set the EOF flag in the result to prevent\nthe client from retrying the READ request. This behavior appears to\nbe consistent with Solaris NFS servers.\n\nNote that NFSv3 and NFSv4 use u64 offset values on the wire. These\nmust be converted to loff_t internally before use -- an implicit\ntype cast is not adequate for this purpose. Otherwise VFS checks\nagainst sb->s_maxbytes do not work properly."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSD: corrige el comportamiento de READ cerca de OFFSET_MAX Dan Aloni informa: > Debido a El commit 8cfb9015280d (\"NFS: siempre proporcione buffers alineados a > las capas de lectura RPC\") en el cliente, una lectura de 0xfff est\u00e1 alineada con el tama\u00f1o del servidor de 0x1000. > > Como resultado, en una prueba donde el servidor tiene un archivo de tama\u00f1o > 0x7ffffffffffffffff, y el cliente intenta leer desde el desplazamiento > 0x7ffffffffffffff000, la lectura causa que loff_t se desborde en el servidor > y devuelve un c\u00f3digo NFS de EINVAL a el cliente. Como resultado, el cliente reintenta indefinidamente la solicitud. El cliente NFS de Linux no maneja NFS?ERR_INVAL, aunque todas las especificaciones de NFS permiten a los servidores devolver ese c\u00f3digo de estado para una READ. En lugar de NFS?ERR_INVAL, haga que las solicitudes READ fuera de rango se realicen correctamente y devuelvan un resultado breve. Establezca el indicador EOF en el resultado para evitar que el cliente vuelva a intentar la solicitud READ. Este comportamiento parece ser coherente con los servidores Solaris NFS. Tenga en cuenta que NFSv3 y NFSv4 utilizan valores de compensaci\u00f3n u64 en el cable. Estos deben convertirse a loff_t internamente antes de su uso; una conversi\u00f3n de tipo impl\u00edcita no es adecuada para este prop\u00f3sito. De lo contrario, las comprobaciones de VFS con sb->s_maxbytes no funcionan correctamente."}], "id": "CVE-2022-48827", "lastModified": "2026-10-14T19:16:56.740", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48827", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:57:40.257913Z", "version": "2.0.3"}}]}, "published": "2024-07-16T12:15:06.420", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1726a39b0879acfb490b22dca643f26f4f907da9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/44502aca8e02ab32d6b0eb52e006a5ec9402719b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6eff5c4277146a78b4fb8c9b668dd64542c41b0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1726a39b0879acfb490b22dca643f26f4f907da9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/44502aca8e02ab32d6b0eb52e006a5ec9402719b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6eff5c4277146a78b4fb8c9b668dd64542c41b0"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:5266", "cpe": "cpe:/o:redhat:rhel_aus:8.4", "package": "kernel-0:4.18.0-305.138.1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5282", "cpe": "cpe:/a:redhat:rhel_tus:8.4::nfv", "package": "kernel-rt-0:4.18.0-305.138.1.rt7.214.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5266", "cpe": "cpe:/o:redhat:rhel_tus:8.4", "package": "kernel-0:4.18.0-305.138.1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5266", "cpe": "cpe:/o:redhat:rhel_e4s:8.4", "package": "kernel-0:4.18.0-305.138.1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5281", "cpe": "cpe:/o:redhat:rhel_aus:8.6", "package": "kernel-0:4.18.0-372.118.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5281", "cpe": "cpe:/o:redhat:rhel_tus:8.6", "package": "kernel-0:4.18.0-372.118.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5281", "cpe": "cpe:/o:redhat:rhel_e4s:8.6", "package": "kernel-0:4.18.0-372.118.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2024-08-13T00:00:00Z"}], "bugzilla": {"description": "kernel: NFSD: Fix the behavior of READ near OFFSET_MAX", "id": "2298166", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2298166"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSD: Fix the behavior of READ near OFFSET_MAX\nDan Aloni reports:\n> Due to commit 8cfb9015280d (\"NFS: Always provide aligned buffers to\n> the RPC read layers\") on the client, a read of 0xfff is aligned up\n> to server rsize of 0x1000.\n>\n> As a result, in a test where the server has a file of size\n> 0x7fffffffffffffff, and the client tries to read from the offset\n> 0x7ffffffffffff000, the read causes loff_t overflow in the server\n> and it returns an NFS code of EINVAL to the client. The client as\n> a result indefinitely retries the request.\nThe Linux NFS client does not handle NFS?ERR_INVAL, even though all\nNFS specifications permit servers to return that status code for a\nREAD.\nInstead of NFS?ERR_INVAL, have out-of-range READ requests succeed\nand return a short result. Set the EOF flag in the result to prevent\nthe client from retrying the READ request. This behavior appears to\nbe consistent with Solaris NFS servers.\nNote that NFSv3 and NFSv4 use u64 offset values on the wire. These\nmust be converted to loff_t internally before use -- an implicit\ntype cast is not adequate for this purpose. Otherwise VFS checks\nagainst sb->s_maxbytes do not work properly.", "A vulnerability was found in the Linux kernel's NFSD, where improper handling of read requests near the maximum offset can lead to an integer overflow. When a client attempts to read from a near-maximum offset, it causes the server to return an invalid NFS error, resulting in indefinite retries by the client. This behavior can disrupt file access and stability in networked environments."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2022-48827", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48827\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48827\nhttps://lore.kernel.org/linux-cve-announce/2024071652-CVE-2022-48827-f95b@gregkh/T"], "threat_severity": "Moderate"}

{}