{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90057",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90057"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "slip: remove slip_hangup() to fix use-after-free in slip_receive_buf()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nslip: remove slip_hangup() to fix use-after-free in slip_receive_buf()\n\nJaeyoung Chung and Eulgyu Kim reported a slab-use-after-free read\nin slip_receive_buf() when racing against tty hangup.\n\ntty_ldisc_hangup() calls ld->ops->hangup() while holding only\na read lock on tty->ldisc_sem (via tty_ldisc_ref()).\nBecause slip_hangup() simply called slip_close(), it ran concurrently\nwith reader functions such as slip_receive_buf().\n\nslip_close() unregisters and frees the net device and its private\nstruct slip, causing concurrent reader threads in slip_receive_buf()\nto dereference freed memory.\n\nLine discipline close() is already guaranteed to be called under\nthe write lock of tty->ldisc_sem during hangup processing\n(in tty_ldisc_reinit() or tty_ldisc_kill()).\n\nRemove slip_hangup() so teardown is serialized cleanly by slip_close().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90057"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a3b1edff1ecb47d323f2506b3ffc22178acd1c6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a2dbac3fb03b4427ccf057debc83fc61ee102529"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de1f978c0f6ab42b28192d74dc59af52fdc76135"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ddbc5dc5a2e29b3934da09c1ba3c930fd8a40fd6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a540a49fcca59d1c92c3a6462e67ca21676a88df"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/23c53269f2baaedf2d92784290cb9ef6db2a3bce"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached by racing local TTY syscalls: ioctl(TIOCSETD, N_SLIP) then write() on a PTY master into pty_write\u2192tty_insert_flip_string_and_push_buffer\u2192flush_to_ldisc\u2192tty_port_default_receive_buf\u2192slip_receive_buf, while close() of that master runs pty_close\u2192tty_vhangup\u2192tty_ldisc_hangup\u2192slip_hangup. Hangup is a local TTY lifecycle event, not bytes from a remote SLIP peer.\nAC:L - The attacker owns both PTY fds and can loop write() on the master (driving slip_receive_buf under tty_ldisc_ref()'s read lock) concurrently with close()\u2192pty_close\u2192tty_vhangup\u2192slip_hangup, which tty_ldisc_hangup() also invokes under only a read lock. Because hangup() is not serialized by ldisc_sem's write side, the attacker creates and retries the race.\nPR:L - Attaching N_SLIP requires slip_open()'s capable(CAP_NET_ADMIN) check, which is ns_capable(&init_user_ns) and is not granted by unshare -Urn. CAP_NET_ADMIN in the initial user namespace is still routinely given to non-root container/network workloads (Docker/K8s --cap-add=NET_ADMIN) without full host root, so privileges required are Low.\nUI:N - The attacker performs every step in its own processes: open(\"/dev/ptmx\"), ioctl(TIOCSETD, N_SLIP), write() to the master, and close() to force pty_close()\u2192tty_vhangup(). No separate victim user or administrator action is required at exploit time.\nS:U - The UAF corrupts the host-kernel net_device allocated in sl_alloc() via alloc_netdev() and its embedded struct slip (netdev_priv). Impact is standard local kernel privilege escalation, not a VM escape or IOMMU/DMA boundary bypass.\nC:H - slip_receive_buf() loads sl from tty->disc_data without an RCU read-side critical section, then reads sl->magic and sl->dev after slip_hangup()\u2192slip_close()\u2192unregister_netdev() has freed that net_device (needs_free_netdev). A use-after-free of this object enables an arbitrary kernel read via heap spray.\nI:H - Once past those checks, slip_receive_buf() takes spin_lock_bh(&sl->lock) and slip_unesc() writes sl->rbuff[sl->rcount++] and sl->flags on the already-freed struct slip, giving a write primitive against a net_device that also carries netdev_ops function pointers.\nA:H - Use-after-free of the SLIP net_device/struct slip causes a kernel oops or panic even when not fully exploited; the report is a KASAN slab-use-after-free read in slip_receive_buf() racing tty hangup."
    }
  }
}