CVE-2022-49928 (GCVE-0-2022-49928)
Vulnerability from cvelistv5 – Published: 2025-05-01 14:11 – Updated: 2026-08-05 08:56
VLAI
EPSS
VEX
Title
SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed
Summary
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed
There is a null-ptr-deref when xps sysfs alloc failed:
BUG: KASAN: null-ptr-deref in sysfs_do_create_link_sd+0x40/0xd0
Read of size 8 at addr 0000000000000030 by task gssproxy/457
CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9
Call Trace:
<TASK>
dump_stack_lvl+0x34/0x44
kasan_report+0xa3/0x120
sysfs_do_create_link_sd+0x40/0xd0
rpc_sysfs_client_setup+0x161/0x1b0
rpc_new_client+0x3fc/0x6e0
rpc_create_xprt+0x71/0x220
rpc_create+0x1d4/0x350
gssp_rpc_create+0xc3/0x160
set_gssp_clnt+0xbc/0x140
write_gssp+0x116/0x1a0
proc_reg_write+0xd6/0x130
vfs_write+0x177/0x690
ksys_write+0xb9/0x150
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
When the xprt_switch sysfs alloc failed, should not add xprt and
switch sysfs to it, otherwise, maybe null-ptr-deref; also initialize
the 'xps_sysfs' to NULL to avoid oops when destroy it.
Severity
7.5 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 14:56 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
baea99445dd4675a834e8a5987d2f368adb62e6c , < d59722d088a9d86ce6d9d39979e5d1d669d249f7
(git)
Affected: baea99445dd4675a834e8a5987d2f368adb62e6c , < 7b189b0aa8dab14b49c31c65af8a982e96e25b62 (git) Affected: baea99445dd4675a834e8a5987d2f368adb62e6c , < cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a (git) |
guessed | |
| Linux | Linux |
Affected:
5.14
Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.78 , ≤ 5.15.* (semver) Unaffected: 6.0.8 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix) |
guessed |
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"status": "final",
"title": "kernel: SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49928.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-29T02:24:41Z",
"cve": "CVE-2022-49928",
"id": "CVE-2022-49928",
"initial_release_date": "2025-05-06T03:07:16Z",
"product_status:known_affected": "339",
"product_status:known_not_affected": "386",
"product_status:recommended": "214",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2022-49928",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49928.json",
"version": "41"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2022-49928",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-10-01T14:56:32.147376Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-01T14:17:42.732Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sunrpc/sysfs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d59722d088a9d86ce6d9d39979e5d1d669d249f7",
"status": "affected",
"version": "baea99445dd4675a834e8a5987d2f368adb62e6c",
"versionType": "git"
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{
"lessThan": "7b189b0aa8dab14b49c31c65af8a982e96e25b62",
"status": "affected",
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"versionType": "git"
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{
"lessThan": "cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a",
"status": "affected",
"version": "baea99445dd4675a834e8a5987d2f368adb62e6c",
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},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/sunrpc/sysfs.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.14"
},
{
"lessThan": "5.14",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.0.*",
"status": "unaffected",
"version": "6.0.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.78",
"versionStartIncluding": "5.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.0.8",
"versionStartIncluding": "5.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1",
"versionStartIncluding": "5.14",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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 \u003cTASK\u003e\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 \u0027xps_sysfs\u0027 to NULL to avoid oops when destroy it."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - On an NFS server, a remote NFSv4 peer can drive SETCLIENTID_CONFIRM/CREATE_SESSION into nfsd4_probe_callback \u2192 setup_callback_client \u2192 rpc_create \u2192 xprt_switch_alloc/rpc_sysfs_*_setup, so the vulnerable SUNRPC sysfs path is reached from network RPC with no local access; lockd NLM\u2192nsm_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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:56:43.886Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-49928",
"datePublished": "2025-05-01T14:11:06.068Z",
"dateReserved": "2025-05-01T14:05:17.253Z",
"dateUpdated": "2026-08-05T08:56:43.886Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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