io_uring: fix link timeout refs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2021-47124
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-03-15 21:15:07 UTC
Updated2026-08-04 10:16:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: io_uring: fix link timeout refs WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 Call Trace: __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] io_put_req fs/io_uring.c:2140 [inline] io_queue_linked_timeout fs/io_uring.c:6300 [inline] __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354 io_submit_sqe fs/io_uring.c:6534 [inline] io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660 __do_sys_io_uring_enter fs/io_uring.c:9240 [inline] __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182 io_link_timeout_fn() should put only one reference of the linked timeout request, however in case of racing with the master request's completion first io_req_complete() puts one and then io_put_req_deferred() is called.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff 0b2a990e5d2f76d020cb840c456e6ec5f0c27530 git Not specified
CNA Linux Linux affected 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff 6f5d7a45f58d3abe3a936de1441b8d6318f978ff git Not specified
CNA Linux Linux affected 9ae1f8dd372e0e4c020b345cf9e09f519265e981 876808dba2ff7509bdd7f230c4f374a0caf4f410 git Not specified
CNA Linux Linux affected 9ae1f8dd372e0e4c020b345cf9e09f519265e981 ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 git Not specified
CNA Linux Linux affected 9ae1f8dd372e0e4c020b345cf9e09f519265e981 a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 git Not specified
CNA Linux Linux affected 567c81912cec641db75ac6cb64c63f8367c97d19 git Not specified
CNA Linux Linux affected 5.10.26 5.10.43 semver Not specified
CNA Linux Linux affected 5.10.26 5.10.55 semver Not specified
CNA Linux Linux affected 5.11.6 5.12 semver Not specified
CNA Linux Linux affected 5.12 Not specified
CNA Linux Linux unaffected 5.12 semver Not specified
CNA Linux Linux unaffected 5.10.43 5.10.* semver Not specified
CNA Linux Linux unaffected 5.10.55 5.10.* semver Not specified
CNA Linux Linux unaffected 5.12.10 5.12.* semver Not specified
CNA Linux Linux unaffected 5.12.19 5.12.* semver Not specified
CNA Linux Linux unaffected 5.13 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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