nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-50401
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-18 16:15:42 UTC
Updated2026-08-04 10:18:14 UTC
DescriptionIn 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 ]------------

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-415 | CWE-415 CWE-415 Double Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 69151594c72a1748cf93ae5b5fa68d5084253dce 707bcca9616002d204091ca7c4d1d91151104332 git Not specified
CNA Linux Linux affected 0c4fb76c4e711d9e4e70ddc6732310a17076175d 15fc60aa5bdcf6d5f93000d3d00579fc67632ee0 git Not specified
CNA Linux Linux affected 22c721560ef24003bcb9c3d9c358841dcfa4e212 9b4ae8c42d2ff09ed7c5832ccce5684c55e5ed23 git Not specified
CNA Linux Linux affected e8cac2e3067e8587f8271c2177cc5ca924a61b54 fddac3b4578d302ac9e51e7f03a9aae6254ae2a3 git Not specified
CNA Linux Linux affected a4abc6b12eb1f7a533c2e7484cfa555454ff0977 c1207219a4bfa50121c9345d5d165470d0a82531 git Not specified
CNA Linux Linux affected a4abc6b12eb1f7a533c2e7484cfa555454ff0977 a472f069ced8601979f53c13c0cf20236074ed46 git Not specified
CNA Linux Linux affected a4abc6b12eb1f7a533c2e7484cfa555454ff0977 e2f9f03e4537f3fcc8fd2bdd3248530c3477a371 git Not specified
CNA Linux Linux affected a4abc6b12eb1f7a533c2e7484cfa555454ff0977 d843ebd860c58a38e45527e8ec6516059f4c97f3 git Not specified
CNA Linux Linux affected a4abc6b12eb1f7a533c2e7484cfa555454ff0977 3bc8edc98bd43540dbe648e4ef91f443d6d20a24 git Not specified
CNA Linux Linux affected f5a50e848e4509448b8b91536b5d421722bf154b git Not specified
CNA Linux Linux affected c745f9ef3c8cbae70556131eaeaf0f64510243b7 git Not specified
CNA Linux Linux affected 4.9.229 4.9.337 semver Not specified
CNA Linux Linux affected 4.14.186 4.14.303 semver Not specified
CNA Linux Linux affected 4.19.130 4.19.270 semver Not specified
CNA Linux Linux affected 5.4.49 5.4.229 semver Not specified
CNA Linux Linux affected 4.4.229 4.5 semver Not specified
CNA Linux Linux affected 5.7.6 5.8 semver Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 4.9.337 4.9.* semver Not specified
CNA Linux Linux unaffected 4.14.303 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.270 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.229 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.163 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.86 5.15.* semver Not specified
CNA Linux Linux unaffected 6.0.16 6.0.* semver Not specified
CNA Linux Linux unaffected 6.1.2 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/707bcca9616002d204091ca7c4d1d91151104332 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a472f069ced8601979f53c13c0cf20236074ed46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e2f9f03e4537f3fcc8fd2bdd3248530c3477a371 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fddac3b4578d302ac9e51e7f03a9aae6254ae2a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/15fc60aa5bdcf6d5f93000d3d00579fc67632ee0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9b4ae8c42d2ff09ed7c5832ccce5684c55e5ed23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c1207219a4bfa50121c9345d5d165470d0a82531 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3bc8edc98bd43540dbe648e4ef91f443d6d20a24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d843ebd860c58a38e45527e8ec6516059f4c97f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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