fsnotify: clear PARENT_WATCHED flags lazily
In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.
- Published
- Oct 9, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 5th percentile
- CWE
- CWE-362
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Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 18 / 40 · 4.7 / 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.
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 kernelbefore 5.10.226
- linux linux kernel5.11 and later · before 5.15.167
- linux linux kernel5.16 and later · before 6.1.109
- linux linux kernel6.2 and later · before 6.6.50
- linux linux kernel6.7 and later · before 6.10.9
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
- 2.6.38affected
- 873feea09ebc980cbd3631b767356ce1eee65ec1 and later · before 3f3ef1d9f66b93913ce2171120d9226b55acd41daffected · git
- 873feea09ebc980cbd3631b767356ce1eee65ec1 and later · before f9a48bc3dd9099935751458a5bbbea4b7c28abc8affected · git
- 873feea09ebc980cbd3631b767356ce1eee65ec1 and later · before d8c42405fc3507cc43ba7e4986a773c3fc633f6eaffected · git
- 873feea09ebc980cbd3631b767356ce1eee65ec1 and later · before fc1b1e135c3f72382f792e6c319fc088d5523ad5affected · git
- 873feea09ebc980cbd3631b767356ce1eee65ec1 and later · before 7ef1d2e240c32b1f337a37232d037b07e3919e1aaffected · git
- 873feea09ebc980cbd3631b767356ce1eee65ec1 and later · before 172e422ffea20a89bfdc672741c1aad6fbb5044eaffected · git
- before 2.6.38not affected · semver
- 5.10.226 and later · up to and including 5.10.*not affected · semver
- 5.15.167 and later · up to and including 5.15.*not 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 6.1.112-1 | 6.1.112-1 |
| Debian:13 | linux | before 6.10.9-1 | 6.10.9-1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.237.1 | 4.12.14-122.237.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_63 | before 1-8.3.1 | 1-8.3.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-source | before 4.12.14-122.237.1 | 4.12.14-122.237.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-syms | before 4.12.14-122.237.1 | 4.12.14-122.237.1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- 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 | 172e422ffea20a89bfdc672741c1aad6fbb5044e | Vendor (CNA) |
| Linux Linux | 3f3ef1d9f66b93913ce2171120d9226b55acd41d | Vendor (CNA) |
| Linux Linux | 7ef1d2e240c32b1f337a37232d037b07e3919e1a | Vendor (CNA) |
| Linux Linux | d8c42405fc3507cc43ba7e4986a773c3fc633f6e | Vendor (CNA) |
| Linux Linux | f9a48bc3dd9099935751458a5bbbea4b7c28abc8 | Vendor (CNA) |
| Linux Linux | fc1b1e135c3f72382f792e6c319fc088d5523ad5 | Vendor (CNA) |
| debian:linux | 6.1.112-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-default | 4.12.14-122.237.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | Package registry (OSV) |
| suse:kernel-source | 4.12.14-122.237.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:kernel-syms | 4.12.14-122.237.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP5_Update_63 | 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.
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).
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.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
CVSS:3.1/AV:L/AC:H/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e
- git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d
- git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a
- git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e
- git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8
- git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5
- lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- cert-portal.siemens.com/productcert/html/ssa-265688.html
- cert-portal.siemens.com/productcert/html/ssa-355557.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.