io_uring: fix link timeout refs
In 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.
- Published
- Mar 15, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.2% · 14th percentile
- CWE
- —
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 7.8
- 2.3 point gap
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.10.26 and later · before 5.10.43
- linux linux kernel5.10.44 and later · before 5.10.55
- linux linux kernel5.12 and later · before 5.12.10
- linux linux kernel5.12.11 and later · before 5.12.19
- linux linux kernel5.13
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 567c81912cec641db75ac6cb64c63f8367c97d19, 5.12affected
- 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff and later · before 0b2a990e5d2f76d020cb840c456e6ec5f0c27530affected · git
- 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff and later · before 6f5d7a45f58d3abe3a936de1441b8d6318f978ffaffected · git
- 9ae1f8dd372e0e4c020b345cf9e09f519265e981 and later · before 876808dba2ff7509bdd7f230c4f374a0caf4f410affected · git
- 9ae1f8dd372e0e4c020b345cf9e09f519265e981 and later · before ff4a96ba5c8f9b266706280ff8021d2ef3f17e86affected · git
- 9ae1f8dd372e0e4c020b345cf9e09f519265e981 and later · before a298232ee6b9a1d5d732aa497ff8be0d45b5bd82affected · git
- 5.10.26 and later · before 5.10.43affected · semver
- 5.10.26 and later · before 5.10.55affected · semver
- 5.11.6 and later · before 5.12affected · semver
- before 5.12not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 5.14.6-1 | 5.14.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0b2a990e5d2f76d020cb840c456e6ec5f0c27530 | Vendor (CNA) |
| Linux Linux | 5.10.43 | Vendor (CNA) |
| Linux Linux | 5.10.55 | Vendor (CNA) |
| Linux Linux | 5.12 | Vendor (CNA) |
| Linux Linux | 6f5d7a45f58d3abe3a936de1441b8d6318f978ff | Vendor (CNA) |
| Linux Linux | 876808dba2ff7509bdd7f230c4f374a0caf4f410 | Vendor (CNA) |
| Linux Linux | a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 | Vendor (CNA) |
| Linux Linux | ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 | Vendor (CNA) |
| debian:linux | 5.14.6-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-0205 · Mar 20, 2024(Linux Kernel Güncellemesi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530
- git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff
- git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410
- git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82
- git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86
Vendor advisories and official records. Exploit/PoC links are deliberately left out.