{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49928", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-01T14:05:17.253Z", "datePublished": "2025-05-01T14:11:06.068Z", "dateUpdated": "2026-08-05T08:56:43.886Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:43.886Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: Fix null-ptr-deref when xps sysfs alloc failed\n\nThere is a null-ptr-deref when xps sysfs alloc failed:\n BUG: KASAN: null-ptr-deref in sysfs_do_create_link_sd+0x40/0xd0\n Read of size 8 at addr 0000000000000030 by task gssproxy/457\n\n CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9\n Call Trace:\n \n dump_stack_lvl+0x34/0x44\n kasan_report+0xa3/0x120\n sysfs_do_create_link_sd+0x40/0xd0\n rpc_sysfs_client_setup+0x161/0x1b0\n rpc_new_client+0x3fc/0x6e0\n rpc_create_xprt+0x71/0x220\n rpc_create+0x1d4/0x350\n gssp_rpc_create+0xc3/0x160\n set_gssp_clnt+0xbc/0x140\n write_gssp+0x116/0x1a0\n proc_reg_write+0xd6/0x130\n vfs_write+0x177/0x690\n ksys_write+0xb9/0x150\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nWhen the xprt_switch sysfs alloc failed, should not add xprt and\nswitch sysfs to it, otherwise, maybe null-ptr-deref; also initialize\nthe 'xps_sysfs' to NULL to avoid oops when destroy it." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - On an NFS server, a remote NFSv4 peer can drive SETCLIENTID_CONFIRM/CREATE_SESSION into nfsd4_probe_callback → setup_callback_client → rpc_create → xprt_switch_alloc/rpc_sysfs_*_setup, so the vulnerable SUNRPC sysfs path is reached from network RPC with no local access; lockd NLM→nsm_create similarly triggers rpc_create from remote lock traffic.\nAC:L - The attacker fully controls NFSv4 client/session establishment that allocates RPC clients and can induce memory pressure so rpc_sysfs_xprt_switch_alloc fails, after which the NULL/uninit xps_sysfs dereference is deterministic with no attacker-uncontrollable race.\nPR:N - SETCLIENTID/CREATE_SESSION are ALLOWED_WITHOUT_FH and commonly accepted with AUTH_UNIX (or equivalent weak RPC auth) on nfsd, so an unauthenticated remote peer needs no host privileges or valid local credentials to reach the callback rpc_create path.\nUI:N - The attacker sends the NFSv4 client-setup compounds themselves; no victim action such as mounting a filesystem or opening a file is required beyond nfsd already listening.\nS:U - Impact is a host-kernel oops/panic in SUNRPC sysfs setup under the same OS authority, with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - This is a pure null-pointer dereference in sysfs_create_link_nowarn/sysfs_do_create_link_sd on a NULL xps_sysfs kobject (KASAN read at 0x30), with no OOB read or disclosure primitive.\nI:N - The fault is a NULL/invalid pointer read during sysfs link creation with no memory write, type confusion, or control-flow hijack beyond the ensuing oops.\nA:H - The confirmed KASAN null-ptr-deref in rpc_sysfs_client_setup causes a kernel oops/panic that a remote peer can trigger whenever xprt-switch sysfs allocation fails, fully denying host availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/sysfs.c" ], "versions": [ { "version": "baea99445dd4675a834e8a5987d2f368adb62e6c", "lessThan": "d59722d088a9d86ce6d9d39979e5d1d669d249f7", "status": "affected", "versionType": "git" }, { "version": "baea99445dd4675a834e8a5987d2f368adb62e6c", "lessThan": "7b189b0aa8dab14b49c31c65af8a982e96e25b62", "status": "affected", "versionType": "git" }, { "version": "baea99445dd4675a834e8a5987d2f368adb62e6c", "lessThan": "cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sunrpc/sysfs.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.78", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.8", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "5.14", "versionEndExcluding": "5.15.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.0.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d59722d088a9d86ce6d9d39979e5d1d669d249f7" }, { "url": "https://git.kernel.org/stable/c/7b189b0aa8dab14b49c31c65af8a982e96e25b62" }, { "url": "https://git.kernel.org/stable/c/cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a" } ], "title": "SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-476", "lang": "en", "description": "CWE-476 NULL Pointer Dereference" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-10-01T14:56:32.147376Z", "id": "CVE-2022-49928", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T14:56:34.636Z" } } ] } }