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CVE-2026-68169 (GCVE-0-2026-68169)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-23 12:46
VLAI
Title
mptcp: pm: userspace: fix use-after-free in get_local_id
Summary
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] <IRQ> [ 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e373bfc8ec3d6496ec7e11dd7f4d087a44b1009a , < 8ce48d2879aafc0e7a6f8bfc3613c0ba979ec6f5 (git)
Affected: ed34dfa19ddbd1e4c85a73636f8cba0211025ea4 , < d2c3760b45f2f481a4dd4c5adef4a29dfabd948f (git)
Affected: f012d796a6de662692159c539689e47e662853a8 , < 31ce5af66891f79998fb2e8b8df08e3c98fd72e3 (git)
Affected: f012d796a6de662692159c539689e47e662853a8 , < d64f6c02495f3fad674038cfa7ec049671b59e7b (git)
Affected: f012d796a6de662692159c539689e47e662853a8 , < 40dde4b5d98279471a70e5c8bb713182738c00d9 (git)
Affected: f012d796a6de662692159c539689e47e662853a8 , < 9bc6d5e4ca9f3cbb41d43400b3a31cb0403796c9 (git)
Affected: 005a3ad289eb604216dcaa03646de36cb08624a0 (git)
Affected: 6.1.79 , < 6.1.184 (semver)
Affected: 6.6.18 , < 6.6.151 (semver)
Affected: 6.7.6 , < 6.8 (semver)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/pm_userspace.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.184",
                  "versionStartIncluding": "6.1.79",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "6.6.18",
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                {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.8",
                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: userspace: fix use-after-free in get_local_id\n\nIn mptcp_pm_userspace_get_local_id(), the address entry is looked up under\nspinlock, but its id is read after dropping the lock. A concurrent deletion\ncan free the entry between the unlock and the read, leading to UAF.\n\nThe race window is narrow. It was reproduced only with a locally\nconstructed stress test that repeatedly overlaps an MP_JOIN SYN with a\nMPTCP_PM_CMD_SUBFLOW_DESTROY request.\n\nHowever, the KASAN report below confirms that the race is reachable:\n\n  [  666.319376] BUG: KASAN: slab-use-after-free in mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\n  [  666.319386] Read of size 1 at addr ffff888124845610 by task swapper/0/0\n  ...\n  [  666.319401] Call Trace:\n  [  666.319405]  \u003cIRQ\u003e\n  [  666.319408]  dump_stack_lvl+0x53/0x70\n  [  666.319412]  print_address_description.constprop.0+0x2c/0x3b0\n  [  666.319418]  print_report+0xbe/0x2b0\n  [  666.319421]  ? mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\n  [  666.319423]  kasan_report+0xce/0x100\n  [  666.319426]  ? mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\n  [  666.319429]  mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\n  [  666.319433]  mptcp_pm_get_local_id+0x371/0x440\n  ...\n  [  666.319821] Allocated by task 45539:\n  [  666.319844]  kasan_save_stack+0x33/0x60\n  [  666.319855]  kasan_save_track+0x14/0x30\n  [  666.319858]  __kasan_kmalloc+0x8f/0xa0\n  [  666.319863]  __kmalloc_noprof+0x1e7/0x520\n  [  666.319867]  sock_kmalloc+0xdf/0x130\n  [  666.319885]  sock_kmemdup+0x1b/0x40\n  [  666.319888]  mptcp_userspace_pm_append_new_local_addr+0x261/0x500\n  [  666.319910]  mptcp_pm_nl_announce_doit+0x16a/0x610\n  ...\n  [  666.319967] Freed by task 45560:\n  [  666.319988]  kasan_save_stack+0x33/0x60\n  [  666.319991]  kasan_save_track+0x14/0x30\n  [  666.319994]  kasan_save_free_info+0x3b/0x60\n  [  666.319998]  __kasan_slab_free+0x43/0x70\n  [  666.320000]  kfree+0x166/0x440\n  [  666.320003]  sock_kfree_s+0x1d/0x50\n  [  666.320007]  mptcp_userspace_pm_delete_local_addr.isra.0+0x157/0x200\n  [  666.320011]  mptcp_pm_nl_subflow_destroy_doit+0x51d/0xea0\n\nFix by copying the id into a local variable while still holding the lock,\nand use -1 as a \"not found\" sentinel."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:03.401Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8ce48d2879aafc0e7a6f8bfc3613c0ba979ec6f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2c3760b45f2f481a4dd4c5adef4a29dfabd948f"
        },
        {
          "url": "https://git.kernel.org/stable/c/31ce5af66891f79998fb2e8b8df08e3c98fd72e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d64f6c02495f3fad674038cfa7ec049671b59e7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/40dde4b5d98279471a70e5c8bb713182738c00d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bc6d5e4ca9f3cbb41d43400b3a31cb0403796c9"
        }
      ],
      "title": "mptcp: pm: userspace: fix use-after-free in get_local_id",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68169",
    "datePublished": "2026-08-10T11:59:38.177Z",
    "dateReserved": "2026-07-30T09:28:09.372Z",
    "dateUpdated": "2026-08-23T12:46:03.401Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68169",
      "date": "2026-09-11",
      "epss": "0.00206",
      "percentile": "0.10684"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:46:57.000Z",
      "cve": "CVE-2026-68169",
      "id": "msrc_CVE-2026-68169",
      "initial_release_date": "2026-08-11T01:16:13.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "mptcp: pm: userspace: fix use-after-free in get_local_id",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-68169.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68169\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-10T13:20:03.483\",\"lastModified\":\"2026-08-23T13:16:34.757\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: pm: userspace: fix use-after-free in get_local_id\\n\\nIn mptcp_pm_userspace_get_local_id(), the address entry is looked up under\\nspinlock, but its id is read after dropping the lock. A concurrent deletion\\ncan free the entry between the unlock and the read, leading to UAF.\\n\\nThe race window is narrow. It was reproduced only with a locally\\nconstructed stress test that repeatedly overlaps an MP_JOIN SYN with a\\nMPTCP_PM_CMD_SUBFLOW_DESTROY request.\\n\\nHowever, the KASAN report below confirms that the race is reachable:\\n\\n  [  666.319376] BUG: KASAN: slab-use-after-free in mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\\n  [  666.319386] Read of size 1 at addr ffff888124845610 by task swapper/0/0\\n  ...\\n  [  666.319401] Call Trace:\\n  [  666.319405]  \u003cIRQ\u003e\\n  [  666.319408]  dump_stack_lvl+0x53/0x70\\n  [  666.319412]  print_address_description.constprop.0+0x2c/0x3b0\\n  [  666.319418]  print_report+0xbe/0x2b0\\n  [  666.319421]  ? mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\\n  [  666.319423]  kasan_report+0xce/0x100\\n  [  666.319426]  ? mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\\n  [  666.319429]  mptcp_userspace_pm_get_local_id+0x1dc/0x1f0\\n  [  666.319433]  mptcp_pm_get_local_id+0x371/0x440\\n  ...\\n  [  666.319821] Allocated by task 45539:\\n  [  666.319844]  kasan_save_stack+0x33/0x60\\n  [  666.319855]  kasan_save_track+0x14/0x30\\n  [  666.319858]  __kasan_kmalloc+0x8f/0xa0\\n  [  666.319863]  __kmalloc_noprof+0x1e7/0x520\\n  [  666.319867]  sock_kmalloc+0xdf/0x130\\n  [  666.319885]  sock_kmemdup+0x1b/0x40\\n  [  666.319888]  mptcp_userspace_pm_append_new_local_addr+0x261/0x500\\n  [  666.319910]  mptcp_pm_nl_announce_doit+0x16a/0x610\\n  ...\\n  [  666.319967] Freed by task 45560:\\n  [  666.319988]  kasan_save_stack+0x33/0x60\\n  [  666.319991]  kasan_save_track+0x14/0x30\\n  [  666.319994]  kasan_save_free_info+0x3b/0x60\\n  [  666.319998]  __kasan_slab_free+0x43/0x70\\n  [  666.320000]  kfree+0x166/0x440\\n  [  666.320003]  sock_kfree_s+0x1d/0x50\\n  [  666.320007]  mptcp_userspace_pm_delete_local_addr.isra.0+0x157/0x200\\n  [  666.320011]  mptcp_pm_nl_subflow_destroy_doit+0x51d/0xea0\\n\\nFix by copying the id into a local variable while still holding the lock,\\nand use -1 as a \\\"not found\\\" sentinel.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/mptcp/pm_userspace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e373bfc8ec3d6496ec7e11dd7f4d087a44b1009a\",\"lessThan\":\"8ce48d2879aafc0e7a6f8bfc3613c0ba979ec6f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed34dfa19ddbd1e4c85a73636f8cba0211025ea4\",\"lessThan\":\"d2c3760b45f2f481a4dd4c5adef4a29dfabd948f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f012d796a6de662692159c539689e47e662853a8\",\"lessThan\":\"31ce5af66891f79998fb2e8b8df08e3c98fd72e3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f012d796a6de662692159c539689e47e662853a8\",\"lessThan\":\"d64f6c02495f3fad674038cfa7ec049671b59e7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f012d796a6de662692159c539689e47e662853a8\",\"lessThan\":\"40dde4b5d98279471a70e5c8bb713182738c00d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f012d796a6de662692159c539689e47e662853a8\",\"lessThan\":\"9bc6d5e4ca9f3cbb41d43400b3a31cb0403796c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"005a3ad289eb604216dcaa03646de36cb08624a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.79\",\"lessThan\":\"6.1.184\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.18\",\"lessThan\":\"6.6.151\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.7.6\",\"lessThan\":\"6.8\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/mptcp/pm_userspace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/31ce5af66891f79998fb2e8b8df08e3c98fd72e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/40dde4b5d98279471a70e5c8bb713182738c00d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8ce48d2879aafc0e7a6f8bfc3613c0ba979ec6f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9bc6d5e4ca9f3cbb41d43400b3a31cb0403796c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2c3760b45f2f481a4dd4c5adef4a29dfabd948f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d64f6c02495f3fad674038cfa7ec049671b59e7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-11T15:31:28+00:00",
      "cve": "CVE-2026-68169",
      "id": "CVE-2026-68169",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mptcp: pm: userspace: fix use-after-free in get_local_id",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68169.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-13T16:23:48Z",
      "cve": "CVE-2026-68169",
      "id": "CVE-2026-68169",
      "initial_release_date": "2026-08-13T16:23:48Z",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "184",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68169",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68169.json",
      "version": "2"
    }
  }
}



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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.