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CVE-2026-45983— nfsd: never defer requests during idmap lookup

AI Predicted 7.5 Difficulty: Easy EPSS 0.03% · P10

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux2f425878b6a71571341dcd3f9e9d1a6f6355da9c< b9abb760db20504240a7147f27934d900cd80b23affected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< 3a72c7dedc99b321e0f267e4e999e5baf07c4593affected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< 99e17b20fddac19a228d213e00f6b9e1c10daff9affected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< 243f71ed873ff3feeb6f9b5cb145d63f7188b4c4affected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< 063a6f22478ef929625000a2caf54667725c1dfdaffected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< d75ec4504a4340b033b15cad0303988b3089dd93affected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< 8dff54fe88c0dcd4c55bff9fc2fa6ca968290826affected
2f425878b6a71571341dcd3f9e9d1a6f6355da9c< f9c206cdc4266caad6a9a7f46341420a10f03ccbaffected
… +10 more rows
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I. Basic Information for CVE-2026-45983

Vulnerability Information
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Vulnerability Title
nfsd: never defer requests during idmap lookup
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: never defer requests during idmap lookup During v4 request compound arg decoding, some ops (e.g. SETATTR) can trigger idmap lookup upcalls. When those upcall responses get delayed beyond the allowed time limit, cache_check() will mark the request for deferral and cause it to be dropped. This prevents nfs4svc_encode_compoundres from being executed, and thus the session slot flag NFSD4_SLOT_INUSE never gets cleared. Subsequent client requests will fail with NFSERR_JUKEBOX, given that the slot will be marked as in-use, making the SEQUENCE op fail. Fix this by making sure that the RQ_USEDEFERRAL flag is always clear during nfs4svc_decode_compoundargs(), since no v4 request should ever be deferred.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nfsd在idmap查找期间未正确处理请求延迟，可能导致会话槽位标志无法清除，后续客户端请求失败。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 2f425878b6a71571341dcd3f9e9d1a6f6355da9c ~ b9abb760db20504240a7147f27934d900cd80b23 -
LinuxLinux 2.6.30 -

II. Public POCs for CVE-2026-45983

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III. Intelligence Information for CVE-2026-45983

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Patches & Fixes for CVE-2026-45983 (8)

Same Patch Batch · Linux · 2026-05-27 · 276 CVEs total

CVE-2026-460399.8 CRITICALrxgk: Fix potential integer overflow in length check
CVE-2026-458989.8 CRITICALRDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-459889.8 CRITICALrxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-459729.8 CRITICALsmb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-460439.1 CRITICALRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-460568.8 HIGHBluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-459458.8 HIGHiommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-458438.2 HIGHslip: bound decode() reads against the compressed packet length
CVE-2026-460378.2 HIGHipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-460108.1 HIGHrxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-460998.1 HIGHnet: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-460767.9 HIGHKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-458947.8 HIGHiommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-459597.8 HIGHcrypto: ccp - Fix a crash due to incorrect cleanup usage of kfree
CVE-2026-460117.8 HIGHmedia: mtk-jpeg: fix use-after-free in release path due to uncancelled work
CVE-2026-460157.8 HIGHtcp: call sk_data_ready() after listener migration
CVE-2026-458527.8 HIGHRDMA/rxe: Fix double free in rxe_srq_from_init
CVE-2026-460587.8 HIGHmedia: amphion: Fix race between m2m job_abort and device_run
CVE-2026-458617.8 HIGHgfs2: Fix slab-use-after-free in qd_put
CVE-2026-460537.8 HIGHnet: rds: fix MR cleanup on copy error

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45983

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