CVE-2024-46865 (GCVE-0-2024-46865)
Vulnerability from cvelistv5 – Published: 2024-09-27 12:42 – Updated: 2026-08-05 11:39
VLAI
EPSS
VEX
Title
fou: fix initialization of grc
Summary
In the Linux kernel, the following vulnerability has been resolved:
fou: fix initialization of grc
The grc must be initialize first. There can be a condition where if
fou is NULL, goto out will be executed and grc would be used
uninitialized.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 13:42 UTC
Assigner
References
9 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
231c235d2f7a66f018f172e26ffd47c363f244ef , < 392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e
(git)
Affected: 4494bccb52ffda22ce5a1163a776d970e6229e08 , < 16ff0895283058b0f96d4fe277aa25ee096f0ea8 (git) Affected: d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3 , < 5d537b8d900514509622ce92330b70d2e581d409 (git) Affected: 1df42be305fe478ded1ee0c1d775f4ece713483b , < 7ae890ee19479eeeb87724cca8430b5cb3660c74 (git) Affected: c46cd6aaca81040deaea3500ba75126963294bd9 , < aca06c617c83295f0caa486ad608fbef7bdc11e8 (git) Affected: 7e4196935069947d8b70b09c1660b67b067e75cb , < 4c8002277167125078e6b9b90137bdf443ebaa08 (git) |
guessed | |
| Linux | Linux |
Affected:
5.10.226 , < 5.10.227
(semver)
Affected: 5.15.167 , < 5.15.168 (semver) Affected: 6.1.110 , < 6.1.111 (semver) Affected: 6.6.51 , < 6.6.52 (semver) Affected: 6.10.10 , < 6.10.11 (semver) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed |
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A remote attacker anywhere on the network can drive this path with crafted packets.\\nAC:L - The attacker can flood the FOU port continuously so a packet is always in flight, and FOU/netns teardown (the window where sk_user_data is NULL) is routine, frequent churn on container and cloud hosts that use FOU-encapsulated tunnels. The attacker also controls the value in the uninitialized stack slot by first sending a GUE packet with GUE_PFLAG_REMCSUM, which stores attacker-derived offset/delta into that exact frame slot in the same function.\\nPR:N - There is no authentication, credential check, or capability test anywhere between packet reception and gue_gro_receive; the FOU socket accepts unsolicited datagrams. No local account or privilege of any kind is required.\\nUI:N - Exploitation occurs entirely in softirq context on packet receipt with no victim action required.\\nS:U - The uninitialized-value use and the resulting write both occur within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The bug reads uninitialized kernel stack memory and folds it into a 16-bit value written into an in-flight network buffer, and the same defect provides an out-of-bounds write primitive at a partially attacker-influenced offset, which under kernel scoring practice is treated as leverageable for arbitrary memory disclosure.\\nI:H - remcsum_unadjust() performs a 2-byte write through a pointer computed from the uninitialized (and attacker-groomable) grc-\u003eoffset; when the size_t arithmetic wraps the write lands far outside any legitimate buffer, giving an out-of-bounds write into kernel memory that can be leveraged for control-flow-relevant corruption.\\nA:H - The wild-pointer 2-byte write at frag0 + ~4GiB faults on unmapped kernel memory and oopses in softirq context, and the surrounding corruption of GRO/checksum state destabilises the receive path \\u2014 a remote unauthenticated kernel crash.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"231c235d2f7a66f018f172e26ffd47c363f244ef\", \"lessThan\": \"392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4494bccb52ffda22ce5a1163a776d970e6229e08\", \"lessThan\": \"16ff0895283058b0f96d4fe277aa25ee096f0ea8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3\", \"lessThan\": \"5d537b8d900514509622ce92330b70d2e581d409\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1df42be305fe478ded1ee0c1d775f4ece713483b\", \"lessThan\": \"7ae890ee19479eeeb87724cca8430b5cb3660c74\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c46cd6aaca81040deaea3500ba75126963294bd9\", \"lessThan\": \"aca06c617c83295f0caa486ad608fbef7bdc11e8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7e4196935069947d8b70b09c1660b67b067e75cb\", \"lessThan\": \"4c8002277167125078e6b9b90137bdf443ebaa08\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/fou_core.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10.226\", \"lessThan\": \"5.10.227\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.167\", \"lessThan\": \"5.15.168\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.110\", \"lessThan\": \"6.1.111\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.51\", \"lessThan\": \"6.6.52\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.10.10\", \"lessThan\": \"6.10.11\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/ipv4/fou_core.c\"], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/392f6a97fcbecc64f0c00058b2db5bb0e4b8cc3e\"}, {\"url\": \"https://git.kernel.org/stable/c/16ff0895283058b0f96d4fe277aa25ee096f0ea8\"}, {\"url\": \"https://git.kernel.org/stable/c/5d537b8d900514509622ce92330b70d2e581d409\"}, {\"url\": \"https://git.kernel.org/stable/c/7ae890ee19479eeeb87724cca8430b5cb3660c74\"}, {\"url\": \"https://git.kernel.org/stable/c/aca06c617c83295f0caa486ad608fbef7bdc11e8\"}, {\"url\": \"https://git.kernel.org/stable/c/4c8002277167125078e6b9b90137bdf443ebaa08\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfou: fix initialization of grc\\n\\nThe grc must be initialize first. There can be a condition where if\\nfou is NULL, goto out will be executed and grc would be used\\nuninitialized.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"5.10.226\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"5.15.167\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.111\", \"versionStartIncluding\": \"6.1.110\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.52\", \"versionStartIncluding\": \"6.6.51\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.11\", \"versionStartIncluding\": \"6.10.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:39:07.502Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-46865\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:39:07.502Z\", \"dateReserved\": \"2024-09-11T15:12:18.294Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-27T12:42:53.691Z\", \"assignerShortName\": \"Linux\"}",
"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.
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.
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