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CVE-2024-35887 (GCVE-0-2024-35887)

Vulnerability from cvelistv5 – Published: 2024-05-19 08:34 – Updated: 2026-09-14 11:57
VLAI
Title
ax25: fix use-after-free bugs caused by ax25_ds_del_timer
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-29 18:31 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 28f2d36ac52225a13e020c2589833f1816a0cfc6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a912ef5b7c5d14fb41b9a7935d1df5bb87058bf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 74204bf9050f7627aead9875fe4e07ba125cb19b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c6a368f9c7af4c14b14d390c2543af8001c9bdb9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fd819ad3ecf6f3c232a06b27423ce9ed8c20da89 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.26 , ≤ 6.6.* (semver)
Unaffected: 6.8.5 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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                  "value": "AV:A - The DAMA slave timer that is used after free is armed and repeatedly re-armed solely by frames from a remote AX.25 peer (SABM with the DAMA bit at net/ax25/ax25_in.c:407, and DAMA polls via ax25_ds_enquiry_response() \u2192 mod_timer()), reached over a point-to-point RF link or bpqether on the local Ethernet segment.\nAC:L - The attacker fully controls the racing side \u2014 keeping a DAMA-slave link up makes ax25_ds_timeout() fire every second and lets the attacker drive mod_timer() from the RX softirq at frame rate, so the window against ax25_dev_device_down()\u0027s non-synchronous del_timer() can be hammered until it is hit, and a single re-arm after the free leaves an armed timer in freed memory.\nPR:N - AX.25 has no authentication whatsoever \u2014 the attacker only needs to transmit frames to a listening AX.25 port to turn on DAMA slave mode and arm the device timer; no account or credential on the target is involved.\nUI:N - No victim action on attacker-supplied content is needed; the free is triggered by a routine port/interface teardown (script-driven port cycling, TNC/serial or bpqether underlying device going down, module unload) while the attacker-maintained timer is active.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed ax25_dev is a kfree\u0027d slab object that can be reallocated and read back through the still-live timer handler, and the surviving armed timer_list gives an attacker-influenced read of freed/reallocated memory usable for kernel address and data disclosure.\nI:H - mod_timer() on the freed object writes into reallocated memory, and the timer core later loads and calls -\u003efunction from the freed ax25_dev, yielding a heap-spray-based control-flow hijack primitive and arbitrary kernel memory modification.\nA:H - Even unexploited, dereferencing and re-arming a timer embedded in freed memory reliably causes slab corruption, list corruption, and kernel oops/panic, taking the system down."
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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.