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CVE Record

CVE-2024-35887: ax25: fix use-after-free bugs caused by ax25_ds_del_timer

In the Linux kernel, the following vulnerability has been resolved: ax25: fix use-after-free bugs caused by ax25_ds_del_timer When the ax25 device is detaching, the ax25_dev_device_down() calls ax25_ds_del_timer() to cleanup the slave_timer. When the timer handler is running, the ax25_ds_del_timer() that calls del_timer() in it will return directly. As a result, the use-after-free bugs could happen, one of the scenarios is shown below: (Thread 1) | (Thread 2) | ax25_ds_timeout() ax25_dev_device_down() | ax25_ds_del_timer() | del_timer() | ax25_dev_put() //FREE | | ax25_dev-> //USE In order to mitigate bugs, when the device is detaching, use timer_shutdown_sync() to stop the timer.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A race condition in Linux AX.25 device shutdown can let a timer access memory after it has been freed. This may cause a crash or potentially compromise confidentiality and integrity. The supplied CVSS score is 8.8, but exposure depends on affected kernel code and AX.25 device activity.

Executive priority

Prioritize remediation for systems using AX.25 or operating in environments where adjacent access is plausible. Treat other systems as verification-driven rather than universally exposed. Because impact is rated high but exploitation is unconfirmed, schedule prompt patching without declaring an active incident solely from this CVE.

Technical view

During AX.25 device detachment, del_timer() could return while ax25_ds_timeout() remained active. ax25_dev_put() could then free the device structure before the handler accessed it, producing a use-after-free. The kernel fix replaces that cleanup behavior with timer_shutdown_sync() to synchronously stop the timer.

Likely exposure

Most concern applies to Linux systems running an affected kernel where AX.25 functionality is present and devices may detach. The bundle lists affected versions including 2.6.12, 6.6.26, 6.8.5, and 6.9, but its version representation is incomplete and should be verified against vendor advisories.

Exploitation context

The supplied CVSS vector indicates adjacent-network reachability, low complexity, no privileges, and no user interaction. However, the bundle provides no evidence of public exploitation or weaponization, and the CVE is not identified as being in CISA KEV. Do not treat active exploitation as established.

Researcher notes

The central condition is a teardown race between ax25_dev_device_down() and ax25_ds_timeout(). The source bundle identifies three stable-kernel commits but does not clearly map each commit to every affected branch. Validate branch-specific backports using kernel or distribution records; avoid relying only on displayed version numbers.

Mitigation direction

  • Update to a vendor kernel release incorporating the applicable upstream fix commit.
  • Confirm the selected distribution package addresses CVE-2024-35887 before deployment.
  • If updating is delayed, obtain vendor guidance because the sources name no operational workaround.

Validation and detection

  • Inventory kernel versions on systems that use or expose AX.25 functionality.
  • Compare kernel package provenance against vendor advisories and the listed upstream fix commits.
  • Confirm the deployed kernel contains the applicable timer_shutdown_sync() change.
  • Review kernel logs for crashes or memory-safety reports involving AX.25 device teardown.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-35887 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2024-35887Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 6.6.26, 6.8.5, 6.9affected
Weakness

CWE details

No CWE listed

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