netrom: Decrease sock refcount when sock timers expire
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.27% (FIRST EPSS).
- 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.
- Fixed version: Linux Linux 25df44e90ff5959b5c24ad361b648504a7e39ef3, 3.19, 4.14.241.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 25df44e90ff5959b5c24ad361b648504a7e39ef3, 3.19, 4.14.241 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.
- Published
- May 21, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 19th percentile
- CWE
- CWE-672
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.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| 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 kernel4.4.173 and later · before 4.4.277
- linux linux kernel4.9.155 and later · before 4.9.277
- linux linux kernel4.14.98 and later · before 4.14.241
- linux linux kernel4.19.20 and later · before 4.19.199
- linux linux kernel5.0 and later · before 5.4.136
- linux linux kernel5.5 and later · before 5.10.54
- linux linux kernel5.11 and later · before 5.13.6
- linux linux kernel3.18.134
- linux linux kernel4.20.7
- linux linux kernel5.14
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
- f1d9a1f2ef6ff17293d21d5e6b80e04bea0cf508, 519e8a22a454b1f1baa3a151b184fe51bc18e178, 5.0affected
- ce29e8a259de767f7210d346ad2b031cb8ab2732 and later · before 853262355518cd1247515b74e83fabf038aa6c29affected · git
- baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f and later · before a01634bf91f2b6c42583770eb6815fb6d1e251cfaffected · git
- 0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb and later · before 48866fd5c361ea417ed24b43fc2a7dc2f5b060efaffected · git
- 2c6b572458a9127e8070df13fa7f115c29ab1d92 and later · before 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950affected · git
- 63346650c1a94a92be61a57416ac88c0a47c4327 and later · before 25df44e90ff5959b5c24ad361b648504a7e39ef3affected · git
- 63346650c1a94a92be61a57416ac88c0a47c4327 and later · before 6811744bd0efb9e472cb15d066cdb460beb8cb8aaffected · git
- 63346650c1a94a92be61a57416ac88c0a47c4327 and later · before bc1660206c3723c37ed4d622ad81781f1e987250affected · git
- 63346650c1a94a92be61a57416ac88c0a47c4327 and later · before 517a16b1a88bdb6b530f48d5d153478b2552d9a8affected · git
- 4.4.173 and later · before 4.4.277affected · 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 |
| SUSE:Linux Enterprise High Availability Extension 12 SP5 | kernel-default | before 4.12.14-122.222.1 | 4.12.14-122.222.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_58 | before 1-8.3.1 | 1-8.3.1 |
| SUSE:Linux Enterprise Real Time 12 SP5 | kernel-rt | before 4.12.14-10.191.1 | 4.12.14-10.191.1 |
| SUSE:Linux Enterprise Real Time 12 SP5 | kernel-rt_debug | before 4.12.14-10.191.1 | 4.12.14-10.191.1 |
| SUSE:Linux Enterprise Real Time 12 SP5 | kernel-source-rt | before 4.12.14-10.191.1 | 4.12.14-10.191.1 |
| SUSE:Linux Enterprise Real Time 12 SP5 | kernel-syms-rt | before 4.12.14-10.191.1 | 4.12.14-10.191.1 |
| SUSE:Linux Enterprise Server 12 SP5 | kernel-azure | before 4.12.14-16.191.1 | 4.12.14-16.191.1 |
| SUSE:Linux Enterprise Server 12 SP5 | kernel-source | before 4.12.14-122.222.1 | 4.12.14-122.222.1 |
| SUSE:Linux Enterprise Server 12 SP5 | kernel-source-azure | before 4.12.14-16.191.1 | 4.12.14-16.191.1 |
| SUSE:Linux Enterprise Server 12 SP5 | kernel-syms | before 4.12.14-122.222.1 | 4.12.14-122.222.1 |
| SUSE:Linux Enterprise Server 12 SP5 | kernel-syms-azure | before 4.12.14-16.191.1 | 4.12.14-16.191.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | kernel-docs | before 4.12.14-122.222.1 | 4.12.14-122.222.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | kernel-obs-build | before 4.12.14-122.222.1 | 4.12.14-122.222.1 |
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
Published before and after this one in the same product
- ← EarlierCVE-2021-47292May 21, 2024 · io_uring: fix memleak in io_init_wq_offload()22Monitor
- ← EarlierCVE-2021-47293May 21, 2024 · net/sched: act_skbmod: Skip non-Ethernet packets31Monitor
- Later →CVE-2021-47295May 21, 2024 · net: sched: fix memory leak in tcindex_partial_destroy_work30Monitor
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 | 25df44e90ff5959b5c24ad361b648504a7e39ef3 | Vendor (CNA) |
| Linux Linux | 3.19 | Vendor (CNA) |
| Linux Linux | 4.14.241 | Vendor (CNA) |
| Linux Linux | 4.19.199 | Vendor (CNA) |
| Linux Linux | 4.21 | Vendor (CNA) |
| Linux Linux | 4.4.277 | Vendor (CNA) |
| Linux Linux | 4.9.277 | Vendor (CNA) |
| Linux Linux | 48866fd5c361ea417ed24b43fc2a7dc2f5b060ef | Vendor (CNA) |
| Linux Linux | 517a16b1a88bdb6b530f48d5d153478b2552d9a8 | Vendor (CNA) |
| Linux Linux | 6811744bd0efb9e472cb15d066cdb460beb8cb8a | Vendor (CNA) |
| Linux Linux | 853262355518cd1247515b74e83fabf038aa6c29 | Vendor (CNA) |
| Linux Linux | 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950 | Vendor (CNA) |
| Linux Linux | a01634bf91f2b6c42583770eb6815fb6d1e251cf | Vendor (CNA) |
| Linux Linux | bc1660206c3723c37ed4d622ad81781f1e987250 | Vendor (CNA) |
| debian:linux | 5.14.6-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-azure | 4.12.14-16.191.1 · SUSE:Linux Enterprise Server 12 SP5 | Package registry (OSV) |
| suse:kernel-default | 4.12.14-122.222.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5 | Package registry (OSV) |
| suse:kernel-docs | 4.12.14-122.222.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5 | Package registry (OSV) |
| suse:kernel-obs-build | 4.12.14-122.222.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5 | Package registry (OSV) |
| suse:kernel-rt | 4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-rt_debug | 4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-source | 4.12.14-122.222.1 · SUSE:Linux Enterprise Server 12 SP5 | Package registry (OSV) |
| suse:kernel-source-azure | 4.12.14-16.191.1 · SUSE:Linux Enterprise Server 12 SP5 | Package registry (OSV) |
| suse:kernel-source-rt | 4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kernel-syms-azure | 4.12.14-16.191.1 · SUSE:Linux Enterprise Server 12 SP5 | Package registry (OSV) |
| suse:kernel-syms-rt | 4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP5_Update_58 | 1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | 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.
- CVE-2021-4706981 days apartipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry28Monitor
- CVE-2024-57929243 days apartdm array: fix releasing a faulty array block twice in dm_array_cursor_end28Monitor
- CVE-2024-49953153 days apartnet/mlx5e: Fix crash caused by calling __xfrm_state_delete() twice22Monitor
- CVE-2024-49955153 days apartACPI: battery: Fix possible crash when unregistering a battery hook22Monitor
- CVE-2024-56674220 days apartvirtio_net: correct netdev_tx_reset_queue() invocation point22Monitor
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-24-0519 · May 22, 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)
CWE-672 · Operation on a Resource after Expiration or ReleaseCVSS 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
Show all references (7 more)Show less
- git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef
- git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8
- git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8a
- git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29
- git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950
- git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cf
- git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250
Vendor advisories and official records. Exploit/PoC links are deliberately left out.