CVE-2026-89698

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89698", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.750Z", "datePublished": "2026-09-11T19:46:16.551Z", "dateUpdated": "2026-10-19T08:51:11.410Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:51:11.410Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage\n\nstruct nfsd_genl_rqstp declares rq_daddr and rq_saddr as plain\n\"struct sockaddr\" (16 bytes). When an IPv6 NFS client is connected,\nnfsd_genl_rpc_status_compose_msg() casts these fields to\n\"struct sockaddr_in6 *\" (28 bytes) and reads sin6_addr at offset 8..24,\nwhich extends 8 bytes past the end of the 16-byte sockaddr field into\nthe adjacent rq_flags member. The 16-byte nla_put_in6_addr then ships 8\nbytes of truncated IPv6 address followed by 8 bytes of rq_flags to\nuserspace via the NFSD_A_RPC_STATUS_SADDR6/DADDR6 netlink attributes.\n\nThis is reachable by any unprivileged process in the network namespace\nbecause NFSD_CMD_RPC_STATUS_GET uses GENL_CMD_CAP_DUMP without\nGENL_ADMIN_PERM.\n\nFix by widening rq_daddr and rq_saddr to struct sockaddr_storage so the\nIPv6 casts operate within bounds, copying sizeof(struct sockaddr_storage)\nbytes in the memcpy calls so the full address is captured, and\nzero-initializing the genl_rqstp stack variable to prevent leaking\nuninitialized tail bytes through netlink."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfsctl.c"], "versions": [{"version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "lessThan": "9a2e791639a1c5cac3f219b0d2632835d8f88d27", "status": "affected", "versionType": "git"}, {"version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "lessThan": "03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5", "status": "affected", "versionType": "git"}, {"version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "lessThan": "dcb69ad0dafb4a24b825183bb94055d5be8a10bd", "status": "affected", "versionType": "git"}, {"version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "lessThan": "a99d720ed2a5258564e5e9d5f39f3184a030d354", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfsctl.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9a2e791639a1c5cac3f219b0d2632835d8f88d27"}, {"url": "https://git.kernel.org/stable/c/03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5"}, {"url": "https://git.kernel.org/stable/c/dcb69ad0dafb4a24b825183bb94055d5be8a10bd"}, {"url": "https://git.kernel.org/stable/c/a99d720ed2a5258564e5e9d5f39f3184a030d354"}], "title": "nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfsctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9a2e791639a1c5cac3f219b0d2632835d8f88d27", "status": "affected", "version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "versionType": "git"}, {"lessThan": "03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5", "status": "affected", "version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "versionType": "git"}, {"lessThan": "dcb69ad0dafb4a24b825183bb94055d5be8a10bd", "status": "affected", "version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "versionType": "git"}, {"lessThan": "a99d720ed2a5258564e5e9d5f39f3184a030d354", "status": "affected", "version": "bd9d6a3efa9709e653aafbeb859289feccb8e70c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/nfsctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage\n\nstruct nfsd_genl_rqstp declares rq_daddr and rq_saddr as plain\n\"struct sockaddr\" (16 bytes). When an IPv6 NFS client is connected,\nnfsd_genl_rpc_status_compose_msg() casts these fields to\n\"struct sockaddr_in6 *\" (28 bytes) and reads sin6_addr at offset 8..24,\nwhich extends 8 bytes past the end of the 16-byte sockaddr field into\nthe adjacent rq_flags member. The 16-byte nla_put_in6_addr then ships 8\nbytes of truncated IPv6 address followed by 8 bytes of rq_flags to\nuserspace via the NFSD_A_RPC_STATUS_SADDR6/DADDR6 netlink attributes.\n\nThis is reachable by any unprivileged process in the network namespace\nbecause NFSD_CMD_RPC_STATUS_GET uses GENL_CMD_CAP_DUMP without\nGENL_ADMIN_PERM.\n\nFix by widening rq_daddr and rq_saddr to struct sockaddr_storage so the\nIPv6 casts operate within bounds, copying sizeof(struct sockaddr_storage)\nbytes in the memcpy calls so the full address is captured, and\nzero-initializing the genl_rqstp stack variable to prevent leaking\nuninitialized tail bytes through netlink."}], "id": "CVE-2026-89698", "lastModified": "2026-10-19T09:18:08.400", "metrics": {}, "published": "2026-09-11T20:19:56.957", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a2e791639a1c5cac3f219b0d2632835d8f88d27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a99d720ed2a5258564e5e9d5f39f3184a030d354"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dcb69ad0dafb4a24b825183bb94055d5be8a10bd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (nfsd): Information disclosure via out-of-bounds read in address handling", "id": "2532229", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532229"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's nfsd component. When an IPv6 NFS client is connected, the `nfsd_genl_rpc_status_compose_msg()` function incorrectly handles address fields, leading to an out-of-bounds read. A local unprivileged attacker can exploit this vulnerability to disclose sensitive kernel memory information, specifically 8 bytes of truncated IPv6 address and 8 bytes of kernel stack data, to userspace."], "name": "CVE-2026-89698", "public_date": "2026-09-11T19:46:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89698\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89698\nhttps://git.kernel.org/stable/c/03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5\nhttps://git.kernel.org/stable/c/a99d720ed2a5258564e5e9d5f39f3184a030d354\nhttps://git.kernel.org/stable/c/dcb69ad0dafb4a24b825183bb94055d5be8a10bd"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd9d6a3efa9709e653aafbeb859289feccb8e70c,03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd9d6a3efa9709e653aafbeb859289feccb8e70c,dcb69ad0dafb4a24b825183bb94055d5be8a10bd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd9d6a3efa9709e653aafbeb859289feccb8e70c,a99d720ed2a5258564e5e9d5f39f3184a030d354)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T04:30:07.740711+00:00", "updated": "2026-09-15T20:00:08.110310+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}