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NVD / CVE Program· CNA Linux

CVE-2024-40995: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()

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: 0.28% (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 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74, 25987a97eec4d5f897cd04ee1b45170829c610da, 5f926aa96b08b6c47178fe1171e7ae331c695fc2; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 6.6.47.1-1; azl3 kernel 6.6.47.1-1 on Azure Linux 3.0 6.6.47.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74, 25987a97eec4d5f897cd04ee1b45170829c610da, 5f926aa96b08b6c47178fe1171e7ae331c695fc2; azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 6.6.47.1-1; azl3 kernel 6.6.47.1-1 on Azure Linux 3.0 6.6.47.1-1 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: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc() syzbot found hanging tasks waiting on rtnl_lock [1] A reproducer is available in the syzbot bug. When a request to add multiple actions with the same index is sent, the second request will block forever on the first request. This holds rtnl_lock, and causes tasks to hang. Return -EAGAIN to prevent infinite looping, while keeping documented behavior. [1] INFO: task kworker/1:0:5088 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: <TASK> context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wiphy_lock include/net/cfg80211.h:5953 [inline] reg_leave_invalid_chans net/wireless/reg.c:2466 [inline] reg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 12, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 21th percentile

Report tools

JSON

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

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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.

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Affected 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.19 and later · before 5.4.279
  • linux linux kernel5.5 and later · before 5.10.221
  • linux linux kernel5.11 and later · before 5.15.162
  • linux linux kernel5.16 and later · before 6.1.96
  • linux linux kernel6.2 and later · before 6.6.36
  • linux linux kernel6.7 and later · before 6.9.7
  • linux linux kernel6.10

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

    • 4.19affected
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before c6a7da65a296745535a964be1019ec7691b0cb90affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 25987a97eec4d5f897cd04ee1b45170829c610daaffected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 6fc78d67f51aeb9a542d39a8714e16bc411582d4affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 5f926aa96b08b6c47178fe1171e7ae331c695fc2affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before 7a0e497b597df7c4cf2b63fc6e9188b6cabe5335affected · git
    • 0190c1d452a91c38a3462abdd81752be1b9006a8 and later · before d864319871b05fadd153e0aede4811ca7008f5d6affected · git
    • before 4.19not affected · semver
    • 5.4.279 and later · up to and including 5.4.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.42.1.el9_47.3.0-427.42.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.42.1.el9_45.14.0-427.42.1.el9_4

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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 KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-40984Jul 12, 2024 · ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."
    22Monitor
  • ← EarlierCVE-2024-40993Jul 12, 2024 · netfilter: ipset: Fix suspicious rcu_dereference_protected()
    22Monitor
  • Later →CVE-2024-40998Jul 12, 2024 · ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74Vendor (CNA)
Linux Linux25987a97eec4d5f897cd04ee1b45170829c610daVendor (CNA)
Linux Linux5f926aa96b08b6c47178fe1171e7ae331c695fc2Vendor (CNA)
Linux Linux6fc78d67f51aeb9a542d39a8714e16bc411582d4Vendor (CNA)
Linux Linux7a0e497b597df7c4cf2b63fc6e9188b6cabe5335Vendor (CNA)
Linux Linuxc6a7da65a296745535a964be1019ec7691b0cb90Vendor (CNA)
Linux Linuxd864319871b05fadd153e0aede4811ca7008f5d6Vendor (CNA)
azl3 kernel 6.6.35.1-5 on Azure Linux 3.06.6.47.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.47.1-1 on Azure Linux 3.06.6.47.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool7.3.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.42.1.el9_4 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.99-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.0.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-284.80.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)

+5

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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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-2024-2703272 days apartf2fs: fix to avoid potential panic during recovery
    25Monitor
  • CVE-2022-4863575 days apartfsdax: Fix infinite loop in dax_iomap_rw()
    24Monitor
  • CVE-2022-487804 days apartnet/smc: Avoid overwriting the copies of clcsock callback functions
    22Monitor
  • CVE-2022-488404 days apartiavf: Fix hang during reboot/shutdown
    22Monitor
  • CVE-2022-488624 days apartvhost: fix hung thread due to erroneous iotlb entries
    22Monitor
  • CVE-2024-4108817 days apartcan: mcp251xfd: fix infinite loop when xmit fails
    22Monitor

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.

All national notices →

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-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

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

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records