bpf: Defer the free of inner map when necessary

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Summary

CVECVE-2023-52447
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-02-22 17:15:08 UTC
Updated2026-05-12 12:16:15 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 6.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416 | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.7MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED6.7MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.7MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bba1dc0b55ac462d24ed1228ad49800c238cd6d7 90c445799fd1dc214d7c6279c144e33a35e29ef2 git Not specified
CNA Linux Linux affected bba1dc0b55ac462d24ed1228ad49800c238cd6d7 37d98fb9c3144c0fddf7f6e99aece9927ac8dce6 git Not specified
CNA Linux Linux affected bba1dc0b55ac462d24ed1228ad49800c238cd6d7 62fca83303d608ad4fec3f7428c8685680bb01b0 git Not specified
CNA Linux Linux affected bba1dc0b55ac462d24ed1228ad49800c238cd6d7 f91cd728b10c51f6d4a39957ccd56d1e802fc8ee git Not specified
CNA Linux Linux affected bba1dc0b55ac462d24ed1228ad49800c238cd6d7 bfd9b20c4862f41d4590fde11d70a5eeae53dcc5 git Not specified
CNA Linux Linux affected bba1dc0b55ac462d24ed1228ad49800c238cd6d7 876673364161da50eed6b472d746ef88242b2368 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 5.10.214 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.153 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.75 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.14 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.2 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified
ADP Linux Linux Kernel affected bba1dc0b55ac 90c445799fd1 git Not specified
ADP Linux Linux Kernel affected bba1dc0b55ac 37d98fb9c314 git Not specified
ADP Linux Linux Kernel affected bba1dc0b55ac 62fca83303d6 git Not specified
ADP Linux Linux Kernel affected bba1dc0b55ac f91cd728b10c git Not specified
ADP Linux Linux Kernel affected bba1dc0b55ac bfd9b20c4862 git Not specified
ADP Linux Linux Kernel affected bba1dc0b55ac 876673364161 git Not specified
ADP Linux Linux Kernel affected 5.9 Not specified
ADP Linux Linux Kernel unaffected 5.9 custom Not specified
ADP Linux Linux Kernel unaffected 5.10.214 5.10.* custom Not specified
ADP Linux Linux Kernel unaffected 5.15.153 5.15.* custom Not specified
ADP Linux Linux Kernel unaffected 6.1.75 6.1.* custom Not specified
ADP Linux Linux Kernel unaffected 6.6.14 6.6.* custom Not specified
ADP Linux Linux Kernel unaffected 6.7.2 6.7.* custom Not specified
ADP Linux Linux Kernel unaffected 6.8 * custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 200182 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-6688-1)
  • 755965 SUSE Enterprise Linux Security Update for the linux kernel (SUSE-SU-2024:0858-1)
  • 756010 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2024:0977-1)
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