CVE-2023-52447 (GCVE-0-2023-52447)

Vulnerability from cvelistv5 – Published: 2024-02-22 16:21 – Updated: 2025-05-04 07:36
VLAI?
Title
bpf: Defer the free of inner map when necessary
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Defer the free of inner map when necessary When updating or deleting an inner map in map array or map htab, the map may still be accessed by non-sleepable program or sleepable program. However bpf_map_fd_put_ptr() decreases the ref-counter of the inner map directly through bpf_map_put(), if the ref-counter is the last one (which is true for most cases), the inner map will be freed by ops->map_free() in a kworker. But for now, most .map_free() callbacks don't use synchronize_rcu() or its variants to wait for the elapse of a RCU grace period, so after the invocation of ops->map_free completes, the bpf program which is accessing the inner map may incur use-after-free problem. Fix the free of inner map by invoking bpf_map_free_deferred() after both one RCU grace period and one tasks trace RCU grace period if the inner map has been removed from the outer map before. The deferment is accomplished by using call_rcu() or call_rcu_tasks_trace() when releasing the last ref-counter of bpf map. The newly-added rcu_head field in bpf_map shares the same storage space with work field to reduce the size of bpf_map.
Severity ?
6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bba1dc0b55ac462d24ed1228ad49800c238cd6d7 , < 90c445799fd1dc214d7c6279c144e33a35e29ef2 (git)
Affected: bba1dc0b55ac462d24ed1228ad49800c238cd6d7 , < 37d98fb9c3144c0fddf7f6e99aece9927ac8dce6 (git)
Affected: bba1dc0b55ac462d24ed1228ad49800c238cd6d7 , < 62fca83303d608ad4fec3f7428c8685680bb01b0 (git)
Affected: bba1dc0b55ac462d24ed1228ad49800c238cd6d7 , < f91cd728b10c51f6d4a39957ccd56d1e802fc8ee (git)
Affected: bba1dc0b55ac462d24ed1228ad49800c238cd6d7 , < bfd9b20c4862f41d4590fde11d70a5eeae53dcc5 (git)
Affected: bba1dc0b55ac462d24ed1228ad49800c238cd6d7 , < 876673364161da50eed6b472d746ef88242b2368 (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.214 , ≤ 5.10.* (semver)
Unaffected: 5.15.153 , ≤ 5.15.* (semver)
Unaffected: 6.1.75 , ≤ 6.1.* (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"version\": \"bba1dc0b55ac462d24ed1228ad49800c238cd6d7\", \"lessThan\": \"f91cd728b10c51f6d4a39957ccd56d1e802fc8ee\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bba1dc0b55ac462d24ed1228ad49800c238cd6d7\", \"lessThan\": \"bfd9b20c4862f41d4590fde11d70a5eeae53dcc5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bba1dc0b55ac462d24ed1228ad49800c238cd6d7\", \"lessThan\": \"876673364161da50eed6b472d746ef88242b2368\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/bpf.h\", \"kernel/bpf/map_in_map.c\", \"kernel/bpf/syscall.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.214\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.153\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.75\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/bpf.h\", \"kernel/bpf/map_in_map.c\", \"kernel/bpf/syscall.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2\"}, {\"url\": \"https://git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6\"}, {\"url\": \"https://git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0\"}, {\"url\": \"https://git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee\"}, {\"url\": \"https://git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5\"}, {\"url\": \"https://git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Defer the free of inner map when necessary\\n\\nWhen updating or deleting an inner map in map array or map htab, the map\\nmay still be accessed by non-sleepable program or sleepable program.\\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\\ndirectly through bpf_map_put(), if the ref-counter is the last one\\n(which is true for most cases), the inner map will be freed by\\nops-\u003emap_free() in a kworker. But for now, most .map_free() callbacks\\ndon\u0027t use synchronize_rcu() or its variants to wait for the elapse of a\\nRCU grace period, so after the invocation of ops-\u003emap_free completes,\\nthe bpf program which is accessing the inner map may incur\\nuse-after-free problem.\\n\\nFix the free of inner map by invoking bpf_map_free_deferred() after both\\none RCU grace period and one tasks trace RCU grace period if the inner\\nmap has been removed from the outer map before. The deferment is\\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\\nfield in bpf_map shares the same storage space with work field to\\nreduce the size of bpf_map.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.214\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.153\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.75\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.14\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.2\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"5.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:36:44.024Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52447\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:36:44.024Z\", \"dateReserved\": \"2024-02-20T12:30:33.292Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-22T16:21:39.032Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • 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.



Detection rules are retrieved from Rulezet.