ax25: fix use-after-free bugs caused by ax25_ds_del_timer (CVE-2024-35887) | HOL Guard CVE

High · CVSS 8.8CVE-2024-35887

ax25: fix use-after-free bugs caused by ax25_ds_del_timer

Answer in brief

CVE-2024-35887 records a High severity (CVSS 8.8) vulnerability in ax25: fix use-after-free bugs caused by ax25_ds_del_timer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 19, 2024Updated Sep 14, 2026Source checked Sep 19, 2026First seen by HOL Aug 5, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.9:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:6.9:rc2::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74204bf9050f7627aead9875fe4e07ba125cb19b \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6a368f9c7af4c14b14d390c2543af8001c9bdb9 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fd819ad3ecf6f3c232a06b27423ce9ed8c20da89	74204bf9050f7627aead9875fe4e07ba125cb19b, c6a368f9c7af4c14b14d390c2543af8001c9bdb9, fd819ad3ecf6f3c232a06b27423ce9ed8c20da89
Linux/Linuxgeneric	2.6.12	Not reported
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28f2d36ac52225a13e020c2589833f1816a0cfc6 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a912ef5b7c5d14fb41b9a7935d1df5bb87058bf \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74204bf9050f7627aead9875fe4e07ba125cb19b \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6a368f9c7af4c14b14d390c2543af8001c9bdb9 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fd819ad3ecf6f3c232a06b27423ce9ed8c20da89	28f2d36ac52225a13e020c2589833f1816a0cfc6, 8a912ef5b7c5d14fb41b9a7935d1df5bb87058bf, 74204bf9050f7627aead9875fe4e07ba125cb19b, c6a368f9c7af4c14b14d390c2543af8001c9bdb9, fd819ad3ecf6f3c232a06b27423ce9ed8c20da89

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 74204bf9050f7627aead9875fe4e07ba125cb19b; Linux/Linux to 28f2d36ac52225a13e020c2589833f1816a0cfc6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
May 19, 2024
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.