CVE-2022-49418

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49418", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.568Z", "datePublished": "2025-02-26T02:12:43.359Z", "dateUpdated": "2026-08-05T08:55:09.630Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:09.630Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Fix free of uninitialized nfs4_label on referral lookup.\n\nSend along the already-allocated fattr along with nfs4_fs_locations, and\ndrop the memcpy of fattr. We end up growing two more allocations, but this\nfixes up a crash as:\n\nPID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: \"ls\"\n #0 [ffffc90000857920] panic at ffffffff81b9bfde\n #1 [ffffc900008579c0] do_trap at ffffffff81023a9b\n #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78\n #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45\n #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de\n #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]\n #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f\n #7 [ffffc90000857c60] walk_component at ffffffff813a86c4\n #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553\n #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in the NFSv4 client referral path (fs/nfs): a malicious or compromised NFS server drives it by returning NFS4ERR_MOVED on LOOKUP and a successful FS_LOCATIONS reply with a different fsid over the network.\nAC:L - The remote server fully controls when MOVED/referral replies are sent and can trigger the path deterministically; CONFIG_NFS_V4_SECURITY_LABEL defaults to y, so the uninitialized-label free is not gated on a rare config.\nPR:N - Exploitation is from the remote NFS peer (or on-path AUTH_SYS attacker) with no account or capability on the victim client; no client-side privileges are required beyond an existing NFSv4 mount relationship.\nUI:N - An already-mounted NFSv4 export plus ordinary client lookups/revalidations (or automount activity) is enough; the malicious server can wait for routine pathwalks without a distinct victim action at exploit time.\nS:U - The uninitialized free and resulting heap corruption stay in the client kernel address space within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - memcpy replaces a valid fattr->label with uninitialized kmalloc garbage, then nfs4_label_free dereferences that pointer (kfree(label->label)/kfree(label)), yielding memory-corruption primitives that can disclose kernel memory when the freed object is reclaimed.\nI:H - Freeing an uninitialized nfs4_label pointer is an arbitrary/corrupt free suitable for heap manipulation and control-flow hijacking, consistent with treating this class of memory corruption as high integrity impact.\nA:H - The reported crash is a kernel panic/oops in nfs_lookup (exc_stack_segment) when the garbage label is freed, and the corruption is repeatable whenever the server returns a referral."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/nfs4namespace.c", "fs/nfs/nfs4proc.c", "fs/nfs/nfs4state.c", "fs/nfs/nfs4xdr.c", "include/linux/nfs_xdr.h"], "versions": [{"version": "9558a007dbc383d48e7f5a123d0b5ff656c71068", "lessThan": "6015292653d95ba9f72906e2b65e536aa5807d64", "status": "affected", "versionType": "git"}, {"version": "9558a007dbc383d48e7f5a123d0b5ff656c71068", "lessThan": "c3ed222745d9ad7b69299b349a64ba533c64a34f", "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/nfs/nfs4namespace.c", "fs/nfs/nfs4proc.c", "fs/nfs/nfs4state.c", "fs/nfs/nfs4xdr.c", "include/linux/nfs_xdr.h"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19", "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": "5.16", "versionEndExcluding": "5.18.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64"}, {"url": "https://git.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f"}], "title": "NFSv4: Fix free of uninitialized nfs4_label on referral lookup.", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfs/nfs4namespace.c", "fs/nfs/nfs4proc.c", "fs/nfs/nfs4state.c", "fs/nfs/nfs4xdr.c", "include/linux/nfs_xdr.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6015292653d95ba9f72906e2b65e536aa5807d64", "status": "affected", "version": "9558a007dbc383d48e7f5a123d0b5ff656c71068", "versionType": "git"}, {"lessThan": "c3ed222745d9ad7b69299b349a64ba533c64a34f", "status": "affected", "version": "9558a007dbc383d48e7f5a123d0b5ff656c71068", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfs/nfs4namespace.c", "fs/nfs/nfs4proc.c", "fs/nfs/nfs4state.c", "fs/nfs/nfs4xdr.c", "include/linux/nfs_xdr.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"lessThan": "5.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.18.*", "status": "unaffected", "version": "5.18.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "98CD047E-3CA9-4A90-93B0-040784FAD016", "versionEndExcluding": "5.18.3", "versionStartIncluding": "5.16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Fix free of uninitialized nfs4_label on referral lookup.\n\nSend along the already-allocated fattr along with nfs4_fs_locations, and\ndrop the memcpy of fattr. We end up growing two more allocations, but this\nfixes up a crash as:\n\nPID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: \"ls\"\n #0 [ffffc90000857920] panic at ffffffff81b9bfde\n #1 [ffffc900008579c0] do_trap at ffffffff81023a9b\n #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78\n #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45\n #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de\n #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]\n #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f\n #7 [ffffc90000857c60] walk_component at ffffffff813a86c4\n #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553\n #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSv4: Se corrige el error nfs4_label no inicializado en la b\u00fasqueda de referencias. Se env\u00eda el fattr ya asignado junto con nfs4_fs_locations y se elimina el memcpy de fattr. Terminamos aumentando dos asignaciones m\u00e1s, pero esto soluciona un fallo como: PID: 790 TAREA: ffff88811b43c000 CPU: 0 COMANDO: \"ls\" #0 [ffffc90000857920] panic en ffffffff81b9bfde #1 [ffffc900008579c0] do_trap en ffffffff81023a9b #2 [ffffc90000857a10] do_error_trap en ffffffff81023b78 #3 [ffffc90000857a58] exc_stack_segment en ffffffff81be1f45 #4 [ffffc90000857a80] asm_exc_stack_segment en ffffffff81c009de #5 [ffffc90000857b08] nfs_lookup en ffffffffa0302322 [nfs] #6 [ffffc90000857b70] __lookup_slow en ffffffff813a4a5f #7 [ffffc90000857c60] walk_component en ffffffff813a86c4 #8 [ffffc90000857cb8] path_lookupat en ffffffff813a9553 #9 [ffffc90000857cf0] filename_lookup en ffffffff813ab86b"}], "id": "CVE-2022-49418", "lastModified": "2026-08-04T10:17:47.810", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"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": "2025-02-26T07:01:18.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: NFSv4: Fix free of uninitialized nfs4_label on referral lookup.", "id": "2348347", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348347"}, "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": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSv4: Fix free of uninitialized nfs4_label on referral lookup.\nSend along the already-allocated fattr along with nfs4_fs_locations, and\ndrop the memcpy of fattr. We end up growing two more allocations, but this\nfixes up a crash as:\nPID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: \"ls\"\n#0 [ffffc90000857920] panic at ffffffff81b9bfde\n#1 [ffffc900008579c0] do_trap at ffffffff81023a9b\n#2 [ffffc90000857a10] do_error_trap at ffffffff81023b78\n#3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45\n#4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de\n#5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]\n#6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f\n#7 [ffffc90000857c60] walk_component at ffffffff813a86c4\n#8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553\n#9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b"], "name": "CVE-2022-49418", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49418\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49418\nhttps://lore.kernel.org/linux-cve-announce/2025022653-CVE-2022-49418-ff01@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:20:14.489711+00:00", "updated": "2025-06-23T08:20:14.489752+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}