Kernel memory corruption via AX.25 timer race
Published May 19, 2024 · Updated Aug 5, 2026
Use-after-free in the Linux AX.25 subsystem allows attackers to corrupt kernel memory via crafted DAMA frames during device teardown. During teardown, ax25_ds_del_timer() uses del_timer(), which can return while ax25_ds_timeout() still runs; ax25_dev_put() then frees the device before the handler dereferences it. Reachability requires an AX.25 peer over radio or bpqether and concurrent interface teardown; the race can expose or modify kernel memory or panic the system.
Summary
What happened
Use-after-free in the Linux AX.25 subsystem allows attackers to corrupt kernel memory via crafted DAMA frames during device teardown. During teardown, ax25_ds_del_timer() uses del_timer(), which can return while ax25_ds_timeout() still runs; ax25_dev_put() then frees the device before the handler dereferences it. Reachability requires an AX.25 peer over radio or bpqether and concurrent interface teardown; the race can expose or modify kernel memory or panic the system.
The record
- CVE
- CVE-2024-35887
- Published
- May 19, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1499
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 19, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74204bf9050f7627aead9875fe4e07ba125cb19b
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6a368f9c7af4c14b14d390c2543af8001c9bdb9
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fd819ad3ecf6f3c232a06b27423ce9ed8c20da89
- Affected versionversion=2.6.12
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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