{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50401", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:06.999Z", "datePublished": "2025-09-18T16:03:47.283Z", "dateUpdated": "2026-08-05T08:58:34.948Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:34.948Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure\n\nOn error situation `clp->cl_cb_conn.cb_xprt` should not be given\na reference to the xprt otherwise both client cleanup and the\nerror handling path of the caller call to put it. Better to\ndelay handing over the reference to a later branch.\n\n[ 72.530665] refcount_t: underflow; use-after-free.\n[ 72.531933] WARNING: CPU: 0 PID: 173 at lib/refcount.c:28 refcount_warn_saturate+0xcf/0x120\n[ 72.533075] Modules linked in: nfsd(OE) nfsv4(OE) nfsv3(OE) nfs(OE) lockd(OE) compat_nfs_ssc(OE) nfs_acl(OE) rpcsec_gss_krb5(OE) auth_rpcgss(OE) rpcrdma(OE) dns_resolver fscache netfs grace rdma_cm iw_cm ib_cm sunrpc(OE) mlx5_ib mlx5_core mlxfw pci_hyperv_intf ib_uverbs ib_core xt_MASQUERADE nf_conntrack_netlink nft_counter xt_addrtype nft_compat br_netfilter bridge stp llc nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set overlay nf_tables nfnetlink crct10dif_pclmul crc32_pclmul ghash_clmulni_intel xfs serio_raw virtio_net virtio_blk net_failover failover fuse [last unloaded: sunrpc]\n[ 72.540389] CPU: 0 PID: 173 Comm: kworker/u16:5 Tainted: G OE 5.15.82-dan #1\n[ 72.541511] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-3.module+el8.7.0+1084+97b81f61 04/01/2014\n[ 72.542717] Workqueue: nfsd4_callbacks nfsd4_run_cb_work [nfsd]\n[ 72.543575] RIP: 0010:refcount_warn_saturate+0xcf/0x120\n[ 72.544299] Code: 55 00 0f 0b 5d e9 01 50 98 00 80 3d 75 9e 39 08 00 0f 85 74 ff ff ff 48 c7 c7 e8 d1 60 8e c6 05 61 9e 39 08 01 e8 f6 51 55 00 <0f> 0b 5d e9 d9 4f 98 00 80 3d 4b 9e 39 08 00 0f 85 4c ff ff ff 48\n[ 72.546666] RSP: 0018:ffffb3f841157cf0 EFLAGS: 00010286\n[ 72.547393] RAX: 0000000000000026 RBX: ffff89ac6231d478 RCX: 0000000000000000\n[ 72.548324] RDX: ffff89adb7c2c2c0 RSI: ffff89adb7c205c0 RDI: ffff89adb7c205c0\n[ 72.549271] RBP: ffffb3f841157cf0 R08: 0000000000000000 R09: c0000000ffefffff\n[ 72.550209] R10: 0000000000000001 R11: ffffb3f841157ad0 R12: ffff89ac6231d180\n[ 72.551142] R13: ffff89ac6231d478 R14: ffff89ac40c06180 R15: ffff89ac6231d4b0\n[ 72.552089] FS: 0000000000000000(0000) GS:ffff89adb7c00000(0000) knlGS:0000000000000000\n[ 72.553175] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 72.553934] CR2: 0000563a310506a8 CR3: 0000000109a66000 CR4: 0000000000350ef0\n[ 72.554874] Call Trace:\n[ 72.555278] \n[ 72.555614] svc_xprt_put+0xaf/0xe0 [sunrpc]\n[ 72.556276] nfsd4_process_cb_update.isra.11+0xb7/0x410 [nfsd]\n[ 72.557087] ? update_load_avg+0x82/0x610\n[ 72.557652] ? cpuacct_charge+0x60/0x70\n[ 72.558212] ? dequeue_entity+0xdb/0x3e0\n[ 72.558765] ? queued_spin_unlock+0x9/0x20\n[ 72.559358] nfsd4_run_cb_work+0xfc/0x270 [nfsd]\n[ 72.560031] process_one_work+0x1df/0x390\n[ 72.560600] worker_thread+0x37/0x3b0\n[ 72.561644] ? process_one_work+0x390/0x390\n[ 72.562247] kthread+0x12f/0x150\n[ 72.562710] ? set_kthread_struct+0x50/0x50\n[ 72.563309] ret_from_fork+0x22/0x30\n[ 72.563818] \n[ 72.564189] ---[ end trace 031117b1c72ec616 ]---\n[ 72.566019] list_add corruption. next->prev should be prev (ffff89ac4977e538), but was ffff89ac4763e018. (next=ffff89ac4763e018).\n[ 72.567647] ------------[ cut here ]------------" } ], "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 nfsd NFSv4.1 callback setup (fs/nfsd/nfs4callback.c), reached when a remote NFS client performs EXCHANGE_ID and CREATE_SESSION with SESSION4_BACK_CHAN over the network-facing NFS service.\nAC:L - The attacker fully controls the NFSv4.1 session and backchannel protocol exchange that drives setup_callback_client, and can induce the required rpc_create/get_backchannel_cred failure path (e.g., via resource exhaustion); no conditions outside attacker influence are required.\nPR:N - EXCHANGE_ID and CREATE_SESSION with SP4_NONE are pre-authentication session-establishment ops reachable with AUTH_NULL/AUTH_UNIX and do not require verified credentials or export-authorized file access.\nUI:N - Exploitation requires only attacker-sent NFS protocol operations; no victim user action is needed.\nS:U - The use-after-free corrupts kernel memory within the host nfsd/sunrpc authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug is a confirmed svc_xprt use-after-free with observed heap corruption, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same use-after-free and list corruption enable heap spraying and control-flow hijacking for arbitrary kernel write/code execution.\nA:H - The use-after-free produces kernel warnings, list corruption, and oops/crash conditions that fully disrupt availability of the NFS server host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfsd/nfs4callback.c" ], "versions": [ { "version": "69151594c72a1748cf93ae5b5fa68d5084253dce", "lessThan": "707bcca9616002d204091ca7c4d1d91151104332", "status": "affected", "versionType": "git" }, { "version": "0c4fb76c4e711d9e4e70ddc6732310a17076175d", "lessThan": "15fc60aa5bdcf6d5f93000d3d00579fc67632ee0", "status": "affected", "versionType": "git" }, { "version": "22c721560ef24003bcb9c3d9c358841dcfa4e212", "lessThan": "9b4ae8c42d2ff09ed7c5832ccce5684c55e5ed23", "status": "affected", "versionType": "git" }, { "version": "e8cac2e3067e8587f8271c2177cc5ca924a61b54", "lessThan": "fddac3b4578d302ac9e51e7f03a9aae6254ae2a3", "status": "affected", "versionType": "git" }, { "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977", "lessThan": "c1207219a4bfa50121c9345d5d165470d0a82531", "status": "affected", "versionType": "git" }, { "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977", "lessThan": "a472f069ced8601979f53c13c0cf20236074ed46", "status": "affected", "versionType": "git" }, { "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977", "lessThan": "e2f9f03e4537f3fcc8fd2bdd3248530c3477a371", "status": "affected", "versionType": "git" }, { "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977", "lessThan": "d843ebd860c58a38e45527e8ec6516059f4c97f3", "status": "affected", "versionType": "git" }, { "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977", "lessThan": "3bc8edc98bd43540dbe648e4ef91f443d6d20a24", "status": "affected", "versionType": "git" }, { "version": "f5a50e848e4509448b8b91536b5d421722bf154b", "status": "affected", "versionType": "git" }, { "version": "c745f9ef3c8cbae70556131eaeaf0f64510243b7", "status": "affected", "versionType": "git" }, { "version": "4.9.229", "lessThan": "4.9.337", "status": "affected", "versionType": "semver" }, { "version": "4.14.186", "lessThan": "4.14.303", "status": "affected", "versionType": "semver" }, { "version": "4.19.130", "lessThan": "4.19.270", "status": "affected", "versionType": "semver" }, { "version": "5.4.49", "lessThan": "5.4.229", "status": "affected", "versionType": "semver" }, { "version": "4.4.229", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "5.7.6", "lessThan": "5.8", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfsd/nfs4callback.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.337", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.86", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "4.9.229", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.186", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.130", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.49", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/707bcca9616002d204091ca7c4d1d91151104332" }, { "url": "https://git.kernel.org/stable/c/15fc60aa5bdcf6d5f93000d3d00579fc67632ee0" }, { "url": "https://git.kernel.org/stable/c/9b4ae8c42d2ff09ed7c5832ccce5684c55e5ed23" }, { "url": "https://git.kernel.org/stable/c/fddac3b4578d302ac9e51e7f03a9aae6254ae2a3" }, { "url": "https://git.kernel.org/stable/c/c1207219a4bfa50121c9345d5d165470d0a82531" }, { "url": "https://git.kernel.org/stable/c/a472f069ced8601979f53c13c0cf20236074ed46" }, { "url": "https://git.kernel.org/stable/c/e2f9f03e4537f3fcc8fd2bdd3248530c3477a371" }, { "url": "https://git.kernel.org/stable/c/d843ebd860c58a38e45527e8ec6516059f4c97f3" }, { "url": "https://git.kernel.org/stable/c/3bc8edc98bd43540dbe648e4ef91f443d6d20a24" } ], "title": "nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50401", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-01-14T19:06:37.052651Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:13:07.779Z" } } ] } }