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CVE-2022-50401 (GCVE-0-2022-50401)

Vulnerability from cvelistv5 – Published: 2025-09-18 16:03 – Updated: 2026-08-05 08:58
VLAI
Title
nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure On error situation `clp->cl_cb_conn.cb_xprt` should not be given a reference to the xprt otherwise both client cleanup and the error handling path of the caller call to put it. Better to delay handing over the reference to a later branch. [ 72.530665] refcount_t: underflow; use-after-free. [ 72.531933] WARNING: CPU: 0 PID: 173 at lib/refcount.c:28 refcount_warn_saturate+0xcf/0x120 [ 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] [ 72.540389] CPU: 0 PID: 173 Comm: kworker/u16:5 Tainted: G OE 5.15.82-dan #1 [ 72.541511] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.16.0-3.module+el8.7.0+1084+97b81f61 04/01/2014 [ 72.542717] Workqueue: nfsd4_callbacks nfsd4_run_cb_work [nfsd] [ 72.543575] RIP: 0010:refcount_warn_saturate+0xcf/0x120 [ 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 [ 72.546666] RSP: 0018:ffffb3f841157cf0 EFLAGS: 00010286 [ 72.547393] RAX: 0000000000000026 RBX: ffff89ac6231d478 RCX: 0000000000000000 [ 72.548324] RDX: ffff89adb7c2c2c0 RSI: ffff89adb7c205c0 RDI: ffff89adb7c205c0 [ 72.549271] RBP: ffffb3f841157cf0 R08: 0000000000000000 R09: c0000000ffefffff [ 72.550209] R10: 0000000000000001 R11: ffffb3f841157ad0 R12: ffff89ac6231d180 [ 72.551142] R13: ffff89ac6231d478 R14: ffff89ac40c06180 R15: ffff89ac6231d4b0 [ 72.552089] FS: 0000000000000000(0000) GS:ffff89adb7c00000(0000) knlGS:0000000000000000 [ 72.553175] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.553934] CR2: 0000563a310506a8 CR3: 0000000109a66000 CR4: 0000000000350ef0 [ 72.554874] Call Trace: [ 72.555278] <TASK> [ 72.555614] svc_xprt_put+0xaf/0xe0 [sunrpc] [ 72.556276] nfsd4_process_cb_update.isra.11+0xb7/0x410 [nfsd] [ 72.557087] ? update_load_avg+0x82/0x610 [ 72.557652] ? cpuacct_charge+0x60/0x70 [ 72.558212] ? dequeue_entity+0xdb/0x3e0 [ 72.558765] ? queued_spin_unlock+0x9/0x20 [ 72.559358] nfsd4_run_cb_work+0xfc/0x270 [nfsd] [ 72.560031] process_one_work+0x1df/0x390 [ 72.560600] worker_thread+0x37/0x3b0 [ 72.561644] ? process_one_work+0x390/0x390 [ 72.562247] kthread+0x12f/0x150 [ 72.562710] ? set_kthread_struct+0x50/0x50 [ 72.563309] ret_from_fork+0x22/0x30 [ 72.563818] </TASK> [ 72.564189] ---[ end trace 031117b1c72ec616 ]--- [ 72.566019] list_add corruption. next->prev should be prev (ffff89ac4977e538), but was ffff89ac4763e018. (next=ffff89ac4763e018). [ 72.567647] ------------[ cut here ]------------
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:06 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 69151594c72a1748cf93ae5b5fa68d5084253dce , < 707bcca9616002d204091ca7c4d1d91151104332 (git)
Affected: 0c4fb76c4e711d9e4e70ddc6732310a17076175d , < 15fc60aa5bdcf6d5f93000d3d00579fc67632ee0 (git)
Affected: 22c721560ef24003bcb9c3d9c358841dcfa4e212 , < 9b4ae8c42d2ff09ed7c5832ccce5684c55e5ed23 (git)
Affected: e8cac2e3067e8587f8271c2177cc5ca924a61b54 , < fddac3b4578d302ac9e51e7f03a9aae6254ae2a3 (git)
Affected: a4abc6b12eb1f7a533c2e7484cfa555454ff0977 , < c1207219a4bfa50121c9345d5d165470d0a82531 (git)
Affected: a4abc6b12eb1f7a533c2e7484cfa555454ff0977 , < a472f069ced8601979f53c13c0cf20236074ed46 (git)
Affected: a4abc6b12eb1f7a533c2e7484cfa555454ff0977 , < e2f9f03e4537f3fcc8fd2bdd3248530c3477a371 (git)
Affected: a4abc6b12eb1f7a533c2e7484cfa555454ff0977 , < d843ebd860c58a38e45527e8ec6516059f4c97f3 (git)
Affected: a4abc6b12eb1f7a533c2e7484cfa555454ff0977 , < 3bc8edc98bd43540dbe648e4ef91f443d6d20a24 (git)
Affected: f5a50e848e4509448b8b91536b5d421722bf154b (git)
Affected: c745f9ef3c8cbae70556131eaeaf0f64510243b7 (git)
Affected: 4.9.229 , < 4.9.337 (semver)
Affected: 4.14.186 , < 4.14.303 (semver)
Affected: 4.19.130 , < 4.19.270 (semver)
Affected: 5.4.49 , < 5.4.229 (semver)
Affected: 4.4.229 , < 4.5 (semver)
Affected: 5.7.6 , < 5.8 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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              "attackComplexity": "LOW",
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              "confidentialityImpact": "HIGH",
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              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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              "status": "unaffected",
              "version": "5.10.163",
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              "status": "unaffected",
              "version": "6.1.2",
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              "version": "6.2",
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      "cpeApplicability": [
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              "operator": "OR"
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      "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-\u003ecl_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 \u003c0f\u003e 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]  \u003cTASK\u003e\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]  \u003c/TASK\u003e\n[   72.564189] ---[ end trace 031117b1c72ec616 ]---\n[   72.566019] list_add corruption. next-\u003eprev should be prev (ffff89ac4977e538), but was ffff89ac4763e018. (next=ffff89ac4763e018).\n[   72.567647] ------------[ cut here ]------------"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "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."
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          "url": "https://git.kernel.org/stable/c/3bc8edc98bd43540dbe648e4ef91f443d6d20a24"
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      "title": "nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure",
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            "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-\u003ecl_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 \u003c0f\u003e 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]  \u003cTASK\u003e\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]  \u003c/TASK\u003e\n[   72.564189] ---[ end trace 031117b1c72ec616 ]---\n[   72.566019] list_add corruption. next-\u003eprev should be prev (ffff89ac4977e538), but was ffff89ac4763e018. (next=ffff89ac4763e018).\n[   72.567647] ------------[ cut here ]------------"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-415"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-415"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:49:24+00:00",
      "cve": "CVE-2022-50401",
      "id": "CVE-2022-50401",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "170",
      "product_status:known_not_affected": "104",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50401.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-29T02:21:24Z",
      "cve": "CVE-2022-50401",
      "id": "CVE-2022-50401",
      "initial_release_date": "2025-09-18T23:43:07Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "294",
      "product_status:recommended": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50401",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50401.json",
      "version": "39"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.8,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-50401",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-14T19:06:37.052651Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-415",
                    "description": "CWE-415 Double Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T19:06:32.934Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/nfsd/nfs4callback.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "707bcca9616002d204091ca7c4d1d91151104332",
                  "status": "affected",
                  "version": "69151594c72a1748cf93ae5b5fa68d5084253dce",
                  "versionType": "git"
                },
                {
                  "lessThan": "15fc60aa5bdcf6d5f93000d3d00579fc67632ee0",
                  "status": "affected",
                  "version": "0c4fb76c4e711d9e4e70ddc6732310a17076175d",
                  "versionType": "git"
                },
                {
                  "lessThan": "9b4ae8c42d2ff09ed7c5832ccce5684c55e5ed23",
                  "status": "affected",
                  "version": "22c721560ef24003bcb9c3d9c358841dcfa4e212",
                  "versionType": "git"
                },
                {
                  "lessThan": "fddac3b4578d302ac9e51e7f03a9aae6254ae2a3",
                  "status": "affected",
                  "version": "e8cac2e3067e8587f8271c2177cc5ca924a61b54",
                  "versionType": "git"
                },
                {
                  "lessThan": "c1207219a4bfa50121c9345d5d165470d0a82531",
                  "status": "affected",
                  "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977",
                  "versionType": "git"
                },
                {
                  "lessThan": "a472f069ced8601979f53c13c0cf20236074ed46",
                  "status": "affected",
                  "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977",
                  "versionType": "git"
                },
                {
                  "lessThan": "e2f9f03e4537f3fcc8fd2bdd3248530c3477a371",
                  "status": "affected",
                  "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977",
                  "versionType": "git"
                },
                {
                  "lessThan": "d843ebd860c58a38e45527e8ec6516059f4c97f3",
                  "status": "affected",
                  "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977",
                  "versionType": "git"
                },
                {
                  "lessThan": "3bc8edc98bd43540dbe648e4ef91f443d6d20a24",
                  "status": "affected",
                  "version": "a4abc6b12eb1f7a533c2e7484cfa555454ff0977",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "f5a50e848e4509448b8b91536b5d421722bf154b",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "c745f9ef3c8cbae70556131eaeaf0f64510243b7",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/nfsd/nfs4callback.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.8"
                },
                {
                  "lessThan": "5.8",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.337",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.303",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.270",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.229",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.163",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.86",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.0.*",
                  "status": "unaffected",
                  "version": "6.0.16",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.2",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.337",
                      "versionStartIncluding": "4.9.229",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.303",
                      "versionStartIncluding": "4.14.186",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.270",
                      "versionStartIncluding": "4.19.130",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.229",
                      "versionStartIncluding": "5.4.49",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.163",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.86",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.0.16",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.2",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2",
                      "versionStartIncluding": "5.8",
                      "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",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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-\u003ecl_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 \u003c0f\u003e 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]  \u003cTASK\u003e\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]  \u003c/TASK\u003e\n[   72.564189] ---[ end trace 031117b1c72ec616 ]---\n[   72.566019] list_add corruption. next-\u003eprev should be prev (ffff89ac4977e538), but was ffff89ac4763e018. (next=ffff89ac4763e018).\n[   72.567647] ------------[ cut here ]------------"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T19:18:48.121Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "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"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-50401",
        "datePublished": "2025-09-18T16:03:47.283Z",
        "dateReserved": "2025-09-17T14:53:06.999Z",
        "dateUpdated": "2026-05-11T19:18:48.121Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.