{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  mptcp: pm: userspace: fix use-after-free in get_local_id  In mptcp_pm_userspace_get_local_id(), the address entry is looked up under spinlock, but its id is read after dropping the lock. A concurrent deletion can free the entry between the unlock and the read, leading to UAF.  The race window is narrow. It was reproduced only with a locally constructed stress test that repeatedly overlaps an MP_JOIN SYN with a MPTCP_PM_CMD_SUBFLOW_DESTROY request.  However, the KASAN report below confirms that the race is reachable:    [  666.319376] BUG: KASAN: slab-use-after-free in mptcp_userspace_pm_get_local_id+0x1dc/0x1f0   [  666.319386] Read of size 1 at addr ffff888124845610 by task swapper/0/0   ...   [  666.319401] Call Trace:   [  666.319405]  \u003cIRQ\u003e   [  666.319408]  dump_stack_lvl+0x53/0x70   [  666.319412]  print_address_description.constprop.0+0x2c/0x3b0   [  666.319418]  print_report+0xbe/0x2b0   [  666.319421]  ? mptcp_userspace_pm_get_local_id+0x1dc/0x1f0   [  666.319423]  kasan_report+0xce/0x100   [  666.319426]  ? mptcp_userspace_pm_get_local_id+0x1dc/0x1f0   [  666.319429]  mptcp_userspace_pm_get_local_id+0x1dc/0x1f0   [  666.319433]  mptcp_pm_get_local_id+0x371/0x440   ...   [  666.319821] Allocated by task 45539:   [  666.319844]  kasan_save_stack+0x33/0x60   [  666.319855]  kasan_save_track+0x14/0x30   [  666.319858]  __kasan_kmalloc+0x8f/0xa0   [  666.319863]  __kmalloc_noprof+0x1e7/0x520   [  666.319867]  sock_kmalloc+0xdf/0x130   [  666.319885]  sock_kmemdup+0x1b/0x40   [  666.319888]  mptcp_userspace_pm_append_new_local_addr+0x261/0x500   [  666.319910]  mptcp_pm_nl_announce_doit+0x16a/0x610   ...   [  666.319967] Freed by task 45560:   [  666.319988]  kasan_save_stack+0x33/0x60   [  666.319991]  kasan_save_track+0x14/0x30   [  666.319994]  kasan_save_free_info+0x3b/0x60   [  666.319998]  __kasan_slab_free+0x43/0x70   [  666.320000]  kfree+0x166/0x440   [  666.320003]  sock_kfree_s+0x1d/0x50   [  666.320007]  mptcp_userspace_pm_delete_local_addr.isra.0+0x157/0x200   [  666.320011]  mptcp_pm_nl_subflow_destroy_doit+0x51d/0xea0  Fix by copying the id into a local variable while still holding the lock, and use -1 as a \"not found\" sentinel.",
  "id": "DEBIAN-CVE-2026-68169",
  "modified": "2026-09-19T21:47:22.592482930Z",
  "published": "2026-08-10T13:20:03.483Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-68169"
    }
  ],
  "upstream": [
    "CVE-2026-68169"
  ]
}