CVE-2021-46959 (GCVE-0-2021-46959)
Vulnerability from cvelistv5 – Published: 2024-02-29 22:31 – Updated: 2025-05-04 12:40
VLAI?
Title
spi: Fix use-after-free with devm_spi_alloc_*
Summary
In the Linux kernel, the following vulnerability has been resolved:
spi: Fix use-after-free with devm_spi_alloc_*
We can't rely on the contents of the devres list during
spi_unregister_controller(), as the list is already torn down at the
time we perform devres_find() for devm_spi_release_controller. This
causes devices registered with devm_spi_alloc_{master,slave}() to be
mistakenly identified as legacy, non-devm managed devices and have their
reference counters decremented below 0.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174
[<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98)
[<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24)
r4:b6700140
[<b0447b2c>] (put_device) from [<b07515e8>] (devm_spi_release_controller+0x3c/0x40)
[<b07515ac>] (devm_spi_release_controller) from [<b045343c>] (release_nodes+0x84/0xc4)
r5:b6700180 r4:b6700100
[<b04533b8>] (release_nodes) from [<b0454160>] (devres_release_all+0x5c/0x60)
r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10
[<b0454104>] (devres_release_all) from [<b044e41c>] (__device_release_driver+0x144/0x1ec)
r5:b117ad94 r4:b163dc10
[<b044e2d8>] (__device_release_driver) from [<b044f70c>] (device_driver_detach+0x84/0xa0)
r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10
[<b044f688>] (device_driver_detach) from [<b044d274>] (unbind_store+0xe4/0xf8)
Instead, determine the devm allocation state as a flag on the
controller which is guaranteed to be stable during cleanup.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
a4add022c1552b0d51a0b89a4781919d6ebac4f9 , < 62bb2c7f2411a0045c24831f11ecacfc35610815
(git)
Affected: 0870525cf94bc27907e94ce99afb6d7239ffd2f5 , < 8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e (git) Affected: 8c45a1c6c951bbe7f95db78fcab46f7337364468 , < 8e029707f50a82c53172359c686b2536ab54e58c (git) Affected: 234b432c7b6184b2d6c5ba2c55f0dd5023c0edf0 , < 28a5529068c51cdf0295ab1e11a99a3a909a03e4 (git) Affected: 3e04a4976addbedcad326f47b0dd4efc570a1fac , < 001c8e83646ad3b847b18f6ac55a54367d917d74 (git) Affected: 5e844cc37a5cbaa460e68f9a989d321d63088a89 , < c7fabe372a9031acd00498bc718ce27c253abfd1 (git) Affected: 5e844cc37a5cbaa460e68f9a989d321d63088a89 , < cee78aa24578edac8cf00513dca618c0acc17cd7 (git) Affected: 5e844cc37a5cbaa460e68f9a989d321d63088a89 , < 8735248ebb918d25427965f0db07939ed0473ec6 (git) Affected: 5e844cc37a5cbaa460e68f9a989d321d63088a89 , < 794aaf01444d4e765e2b067cba01cc69c1c68ed9 (git) Affected: bd1a5b2307279029faaddbecf2f2ac25eaef8dc6 (git) |
|||||||
|
|||||||||
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\"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/spi/spi.c\", \"include/linux/spi/spi.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815\"}, {\"url\": \"https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e\"}, {\"url\": \"https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58c\"}, {\"url\": \"https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4\"}, {\"url\": \"https://git.kernel.org/stable/c/001c8e83646ad3b847b18f6ac55a54367d917d74\"}, {\"url\": \"https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1\"}, {\"url\": \"https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7\"}, {\"url\": \"https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6\"}, {\"url\": \"https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nspi: Fix use-after-free with devm_spi_alloc_*\\n\\nWe can\u0027t rely on the contents of the devres list during\\nspi_unregister_controller(), as the list is already torn down at the\\ntime we perform devres_find() for devm_spi_release_controller. This\\ncauses devices registered with devm_spi_alloc_{master,slave}() to be\\nmistakenly identified as legacy, non-devm managed devices and have their\\nreference counters decremented below 0.\\n\\n------------[ cut here ]------------\\nWARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174\\n[\u003cb0396f04\u003e] (refcount_warn_saturate) from [\u003cb03c56a4\u003e] (kobject_put+0x90/0x98)\\n[\u003cb03c5614\u003e] (kobject_put) from [\u003cb0447b4c\u003e] (put_device+0x20/0x24)\\n r4:b6700140\\n[\u003cb0447b2c\u003e] (put_device) from [\u003cb07515e8\u003e] (devm_spi_release_controller+0x3c/0x40)\\n[\u003cb07515ac\u003e] (devm_spi_release_controller) from [\u003cb045343c\u003e] (release_nodes+0x84/0xc4)\\n r5:b6700180 r4:b6700100\\n[\u003cb04533b8\u003e] (release_nodes) from [\u003cb0454160\u003e] (devres_release_all+0x5c/0x60)\\n r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10\\n[\u003cb0454104\u003e] (devres_release_all) from [\u003cb044e41c\u003e] (__device_release_driver+0x144/0x1ec)\\n r5:b117ad94 r4:b163dc10\\n[\u003cb044e2d8\u003e] (__device_release_driver) from [\u003cb044f70c\u003e] (device_driver_detach+0x84/0xa0)\\n r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10\\n[\u003cb044f688\u003e] (device_driver_detach) from [\u003cb044d274\u003e] (unbind_store+0xe4/0xf8)\\n\\nInstead, determine the devm allocation state as a flag on the\\ncontroller which is guaranteed to be stable during cleanup.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.271\", \"versionStartIncluding\": \"4.4.248\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.271\", \"versionStartIncluding\": \"4.9.248\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.14.212\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.19.163\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"5.4.80\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.9.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:40:37.929Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-46959\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:40:37.929Z\", \"dateReserved\": \"2024-02-27T18:42:55.939Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:31:12.304Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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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