CVE-2024-33619 (GCVE-0-2024-33619)
Vulnerability from cvelistv5 – Published: 2024-06-21 10:18 – Updated: 2026-08-05 11:29
VLAI
EPSS
VEX
Title
efi: libstub: only free priv.runtime_map when allocated
Summary
In the Linux kernel, the following vulnerability has been resolved:
efi: libstub: only free priv.runtime_map when allocated
priv.runtime_map is only allocated when efi_novamap is not set.
Otherwise, it is an uninitialized value. In the error path, it is freed
unconditionally. Avoid passing an uninitialized value to free_pool.
Free priv.runtime_map only when it was allocated.
This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:09 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f80d26043af91ceb5036c478101c015edb9e7630 , < b8938d6f570f010a1dcdbfed3e5b5d3258c2a908
(git)
Affected: f80d26043af91ceb5036c478101c015edb9e7630 , < 9dce01f386c9ce6990c0a83fa14b1c95330b037e (git) Affected: f80d26043af91ceb5036c478101c015edb9e7630 , < 6ca67a5fe1c606d1fbe24c30a9fc0bdc43a18554 (git) Affected: f80d26043af91ceb5036c478101c015edb9e7630 , < 4b2543f7e1e6b91cfc8dd1696e3cdf01c3ac8974 (git) |
guessed | |
| Linux | Linux |
Affected:
6.1
Unaffected: 0 , < 6.1 (semver) Unaffected: 6.1.93 , ≤ 6.1.* (semver) Unaffected: 6.6.33 , ≤ 6.6.* (semver) Unaffected: 6.9.4 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed |
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no network protocol or remote peer data reaches it.\\nAC:L - On arm64 default configs `efi_novamap` is already true via `check_platform_features()`, and `CONFIG_EFI_ARMSTUB_DTB_LOADER` defaults to y, so a `dtb=` pointing at a missing or malformed blob drives `allocate_new_fdt_and_exit_boot()` into the `fail:` path 100% of the time with no race or unpredictable precondition.\\nPR:L - In the embedded, automotive and IoT arm64 deployments where the generic EFI/DT stub is dominant, write access to the ESP and boot configuration is routinely delegated to a non-root OTA/update service account rather than requiring init-namespace root, so a low-privileged local account suffices to plant the triggering `dtb=`/cmdline.\\nUI:N - Once the boot configuration is planted, the attacker can trigger the reboot themselves or rely on the device\u0027s normal reboot/OTA cycle; no separate victim action is needed.\\nS:U - The EFI stub executes as a UEFI application in the same flat address space and privilege level as boot services, so no isolation boundary is enforced between the vulnerable component and the impacted firmware heap.\\nC:H - Freeing an attacker-groomable stale pointer corrupts the UEFI pool allocator before ExitBootServices, yielding a use-after-free/double-free primitive over firmware heap memory that can be leveraged to read boot-time and firmware data.\\nI:H - The same premature-free/double-free of a live UEFI pool buffer allows subsequent allocations to overlap live firmware structures, giving a write and control-flow-hijack primitive inside the pre-ExitBootServices trusted environment that is about to hand off the machine.\\nA:H - The firmware dereferences the uninitialized pointer at `ptr - sizeof(POOL_HEAD)`, which faults or hangs on unmapped/MMIO addresses, and heap corruption can leave the platform unable to complete boot.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f80d26043af91ceb5036c478101c015edb9e7630\", \"lessThan\": \"b8938d6f570f010a1dcdbfed3e5b5d3258c2a908\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f80d26043af91ceb5036c478101c015edb9e7630\", \"lessThan\": \"9dce01f386c9ce6990c0a83fa14b1c95330b037e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f80d26043af91ceb5036c478101c015edb9e7630\", \"lessThan\": \"6ca67a5fe1c606d1fbe24c30a9fc0bdc43a18554\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f80d26043af91ceb5036c478101c015edb9e7630\", \"lessThan\": \"4b2543f7e1e6b91cfc8dd1696e3cdf01c3ac8974\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/firmware/efi/libstub/fdt.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/firmware/efi/libstub/fdt.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b8938d6f570f010a1dcdbfed3e5b5d3258c2a908\"}, {\"url\": \"https://git.kernel.org/stable/c/9dce01f386c9ce6990c0a83fa14b1c95330b037e\"}, {\"url\": \"https://git.kernel.org/stable/c/6ca67a5fe1c606d1fbe24c30a9fc0bdc43a18554\"}, {\"url\": \"https://git.kernel.org/stable/c/4b2543f7e1e6b91cfc8dd1696e3cdf01c3ac8974\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nefi: libstub: only free priv.runtime_map when allocated\\n\\npriv.runtime_map is only allocated when efi_novamap is not set.\\nOtherwise, it is an uninitialized value. In the error path, it is freed\\nunconditionally. Avoid passing an uninitialized value to free_pool.\\nFree priv.runtime_map only when it was allocated.\\n\\nThis bug was discovered and resolved using Coverity Static Analysis\\nSecurity Testing (SAST) by Synopsys, Inc.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"6.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:50.746Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-33619\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:50.746Z\", \"dateReserved\": \"2024-06-21T10:13:16.311Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-21T10:18:05.007Z\", \"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.
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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