CVE-2024-42280 (GCVE-0-2024-42280)

Vulnerability from cvelistv5 – Published: 2024-08-17 09:08 – Updated: 2026-08-05 11:36
VLAI
Title
mISDN: Fix a use after free in hfcmulti_tx()
Summary
In the Linux kernel, the following vulnerability has been resolved: mISDN: Fix a use after free in hfcmulti_tx() Don't dereference *sp after calling dev_kfree_skb(*sp).
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < 70db2c84631f50e02e6b32b543700699dd395803 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < d3e4d4a98c5629ccdcb762a0ff6c82ba9738a0c3 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < 9460ac3dd1ae033bc2b021a458fb535a0c36ddb2 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < 8f4030277dfb9dbe04fd78566b19931097c9d629 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < 4d8b642985ae24f4b3656438eb8489834a17bb80 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < ddc79556641ee070d36be0de4a1f0a16a71f1fc7 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < 7e4a539bca7d8d20f2c5d93c18cce8ef77cd78e0 (git)
Affected: af69fb3a8ffa37e986db00ed93099dc44babeef4 , < 61ab751451f5ebd0b98e02276a44e23a10110402 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - `hfcmulti_tx()` is reached from `mISDN_sock_sendmsg()` \u2192 `handle_bmsg()`/`handle_dmsg()` on an `AF_ISDN` SOCK_DGRAM socket, i.e. a local syscall path, or from the card\u0027s IRQ/timer handler on the same host. There is no IP-network-facing consumer of this code.\nAC:L - The attacker deterministically arms the path by issuing two back-to-back `sendmsg()` calls so `bchannel_senddata()` sets `FLG_TX_NEXT`/`next_skb` (or `dchannel_senddata()` queues to `squeue`), guaranteeing `get_next_bframe()`/`get_next_dframe()` returns 1 and the post-free dereference executes. All call sites hold `hc-\u003elock`, so there is no race to win and no memory-layout precondition.\nPR:L - `data_sock_create()` performs no `capable()` check \u2014 only `base_sock_create()` (ISDN_P_BASE/SOCK_RAW) requires `CAP_NET_RAW` \u2014 and `data_sock_bind()`/`connect_Bstack()` add no further gate, so any unprivileged local user can bind a B- or D-channel and drive the transmit path.\nUI:N - The attacker performs every step itself \u2014 socket, bind, PH_ACTIVATE_REQ, then the two queued sends \u2014 with no action required from an administrator or any other user.\nS:U - The freed object is a kernel `sk_buff` and any corruption stays within the kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Per the published use-after-free, the stale `(*sp)-\u003elen` sizes a `write_fifo()` read from `(*sp)-\u003edata`, pushing freed-heap contents out onto the ISDN B-/D-channel to the far end of the line; heap grooming of the reclaimed skb makes this a controllable kernel-memory disclosure.\nI:H - A use-after-free lets the attacker reclaim the freed `sk_buff` with attacker-shaped data, so the `len` and `data` fields consumed afterwards become attacker-controlled, yielding a write/pointer primitive usable for control-flow hijacking.\nA:H - Dereferencing a freed skb and DMAing/PIO-ing from a dangling `data` pointer readily oopses or panics the kernel, and the sequence can be repeated at will from an unprivileged process."
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    "datePublished": "2024-08-17T09:08:47.699Z",
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      "cve": "CVE-2024-42280",
      "date": "2026-08-05",
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      "cve": "CVE-2024-42280",
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      "title": "mISDN: Fix a use after free in hfcmulti_tx()",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42280\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-17T09:15:08.943\",\"lastModified\":\"2026-06-17T07:49:09.963\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmISDN: Fix a use after free in hfcmulti_tx()\\n\\nDon\u0027t dereference *sp after calling dev_kfree_skb(*sp).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mISDN: corrige un use after free en hfcmulti_tx() No elimine la referencia a *sp despu\u00e9s de llamar a 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:28:46+00:00",
      "cve": "CVE-2024-42280",
      "id": "CVE-2024-42280",
      "initial_release_date": "2024-08-17T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mISDN: Fix a use after free in hfcmulti_tx()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-42280.json",
      "version": "3"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2024-42280\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:03:20.326Z\", \"dateReserved\": \"2024-07-30T07:40:12.261Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-17T09:08:47.699Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.