CVE-2024-27388 (GCVE-0-2024-27388)
Vulnerability from cvelistv5 – Published: 2024-05-01 13:05 – Updated: 2026-08-05 11:29
VLAI
EPSS
VEX
Title
SUNRPC: fix some memleaks in gssx_dec_option_array
Summary
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: fix some memleaks in gssx_dec_option_array
The creds and oa->data need to be freed in the error-handling paths after
their allocation. So this patch add these deallocations in the
corresponding paths.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:43 UTC
Assigner
References
11 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1d658336b05f8697d6445834f8867f8ad5e4f735 , < b97c37978ca825557d331c9012e0c1ddc0e42364
(git)
Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < bfa9d86d39a0fe4685f90c3529aa9bd62a9d97a8 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < bb336cd8d5ecb69c430ebe3e7bcff68471d93fa8 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < dd292e884c649f9b1c18af0ec75ca90b390cd044 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 934212a623cbab851848b6de377eb476718c3e4c (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 5e6013ae2c8d420faea553d363935f65badd32c3 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 9806c2393cd2ab0a8e7bb9ffae02ce20e3112ec4 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 996997d1fb2126feda550d6adcedcbd94911fc69 (git) Affected: 1d658336b05f8697d6445834f8867f8ad5e4f735 , < 3cfcfc102a5e57b021b786a755a38935e357797d (git) |
guessed | |
| Linux | Linux |
Affected:
3.10
Unaffected: 0 , < 3.10 (semver) Unaffected: 4.19.311 , ≤ 4.19.* (semver) Unaffected: 5.4.273 , ≤ 5.4.* (semver) Unaffected: 5.10.214 , ≤ 5.10.* (semver) Unaffected: 5.15.153 , ≤ 5.15.* (semver) Unaffected: 6.1.83 , ≤ 6.1.* (semver) Unaffected: 6.6.23 , ≤ 6.6.* (semver) Unaffected: 6.7.11 , ≤ 6.7.* (semver) Unaffected: 6.8.2 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"url": "https://git.kernel.org/stable/c/dd292e884c649f9b1c18af0ec75ca90b390cd044"
},
{
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"url": "https://git.kernel.org/stable/c/934212a623cbab851848b6de377eb476718c3e4c"
},
{
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],
"url": "https://git.kernel.org/stable/c/5e6013ae2c8d420faea553d363935f65badd32c3"
},
{
"tags": [
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"url": "https://git.kernel.org/stable/c/9806c2393cd2ab0a8e7bb9ffae02ce20e3112ec4"
},
{
"tags": [
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],
"url": "https://git.kernel.org/stable/c/996997d1fb2126feda550d6adcedcbd94911fc69"
},
{
"tags": [
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],
"url": "https://git.kernel.org/stable/c/3cfcfc102a5e57b021b786a755a38935e357797d"
},
{
"tags": [
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
},
{
"tags": [
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-27388",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:43:49.125516Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-11T12:42:16.874Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "0",
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},
{
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"status": "unaffected",
"version": "4.19.311",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.4.273",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.214",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.153",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.83",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.23",
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{
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"status": "unaffected",
"version": "6.7.11",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.8.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix"
}
]
}
],
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: fix some memleaks in gssx_dec_option_array\n\nThe creds and oa-\u003edata need to be freed in the error-handling paths after\ntheir allocation. So this patch add these deallocations in the\ncorresponding paths."
}
],
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"value": "AV:N - The vulnerable decoder is executed only as a direct consequence of an RPCSEC_GSS_INIT request arriving at in-kernel nfsd over TCP/2049, so a remote NFS client drives entry into the code and controls how often it runs. Although the malformed/short XDR reply is delivered by the local gssproxy daemon, the attacker\u0027s reach to the vulnerable function is purely over the network.\nAC:L - The attacker can invoke the upcall path an unlimited number of times pre-authentication, and each invocation pins 256 KB of receive pages plus the in-token pages, letting the attacker themselves create the slab/memory-pressure condition under which the `kzalloc(struct svc_cred)` fails and the dangling-pointer path is taken (trivially so for a memcg-limited/containerized nfsd). The attacker also influences gssproxy reply size via principal name length and group-list size, driving the `-ENOSPC` decode-error paths, so the required conditions are attacker-inducible rather than beyond their control.\nPR:N - `svcauth_gss_proxy_init()` is reached from `svcauth_gss_proc_init()` on the very first leg of the GSS handshake, before any Kerberos credential is validated \u2014 the upcall is performed even for a garbage input token. No account, key, or prior authentication on the NFS server is needed.\nUI:N - The path is triggered entirely by an inbound RPC from the attacker; no administrator or user of the target system needs to mount, click, or open anything.\nS:U - The corrupted objects (`gssx_option`, `svc_cred`) and the resulting heap damage are all inside the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - With `oa-\u003ecount == 1` and `oa-\u003edata` dangling, `gssp_accept_sec_context_upcall()` reads `res.options.data[0].value` out of a freed kmalloc-32 object and then dereferences the pointer it finds there into `data-\u003ecreds`, so freed/reallocated kernel memory contents are consumed and can populate `cr_uid`/`cr_gid`/`cr_principal` \u2014 a use-after-free read that both discloses kernel memory and can determine the identity the NFS client is authenticated as.\nI:H - The same path yields `kfree()` of a pointer taken from freed memory plus a double free of `oa-\u003edata`, and later `free_svc_cred()` performs `put_group_info()`, `gss_mech_put()` and further `kfree()`s on attacker-groomable pointers \u2014 an arbitrary-free and arbitrary-refcount-decrement primitive that is a well-established route to controlled heap corruption and control-flow hijack.\nA:H - The double free trips SLUB\u0027s free-object detection (`BUG`/panic, fatal with `panic_on_oops` on the appliance and NAS deployments where nfsd+gssproxy is typical), and the NULL `oa-\u003edata` variant of the same incoherent `oa-\u003ecount` faults immediately in the caller. The unbounded, remotely repeatable leakage of the decoder\u0027s allocations additionally drives the server toward OOM."
}
]
}
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{
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},
{
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],
"title": "SUNRPC: fix some memleaks in gssx_dec_option_array",
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"assignerShortName": "Linux",
"cveId": "CVE-2024-27388",
"datePublished": "2024-05-01T13:05:05.518Z",
"dateReserved": "2024-02-25T13:47:42.676Z",
"dateUpdated": "2026-08-05T11:29:23.858Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
}
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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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