CVE-2026-53005 (GCVE-0-2026-53005)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-28 06:37
VLAI
Title
af_unix: Drop all SCM attributes for SOCKMAP.
Summary
In the Linux kernel, the following vulnerability has been resolved: af_unix: Drop all SCM attributes for SOCKMAP. SOCKMAP can hide inflight fd from AF_UNIX GC. When a socket in SOCKMAP receives skb with inflight fd, sk_psock_verdict_data_ready() looks up the mapped socket and enqueue skb to its psock->ingress_skb. Since neither the old nor the new GC can inspect the psock queue, the hidden skb leaks the inflight sockets. Note that this cannot be detected via kmemleak because inflight sockets are linked to a global list. In addition, SOCKMAP redirect breaks the Tarjan-based GC's assumption that unix_edge.successor is always alive, which is no longer true once skb is redirected, resulting in use-after-free below. [0] Moreover, SOCKMAP does not call scm_stat_del() properly, so unix_show_fdinfo() could report an incorrect fd count. sk_msg_recvmsg() does not support any SCM attributes in the first place. Let's drop all SCM attributes before passing skb to the SOCKMAP layer. [0]: BUG: KASAN: slab-use-after-free in unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251) Read of size 8 at addr ffff888125362670 by task kworker/56:1/496 CPU: 56 UID: 0 PID: 496 Comm: kworker/56:1 Not tainted 7.0.0-rc7-00263-gb9d8b856689d #3 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 Workqueue: events sk_psock_backlog Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:122) print_report (mm/kasan/report.c:379) kasan_report (mm/kasan/report.c:597) unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251) unix_destroy_fpl (net/unix/garbage.c:317) unix_destruct_scm (./include/net/scm.h:80 ./include/net/scm.h:86 net/unix/af_unix.c:1976) sk_psock_backlog (./include/linux/skbuff.h:?) process_scheduled_works (kernel/workqueue.c:?) worker_thread (kernel/workqueue.c:?) kthread (kernel/kthread.c:438) ret_from_fork (arch/x86/kernel/process.c:164) ret_from_fork_asm (arch/x86/entry/entry_64.S:258) </TASK> Allocated by task 955: kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78) __kasan_slab_alloc (mm/kasan/common.c:369) kmem_cache_alloc_noprof (mm/slub.c:4539) sk_prot_alloc (net/core/sock.c:2240) sk_alloc (net/core/sock.c:2301) unix_create1 (net/unix/af_unix.c:1099) unix_create (net/unix/af_unix.c:1169) __sock_create (net/socket.c:1606) __sys_socketpair (net/socket.c:1811) __x64_sys_socketpair (net/socket.c:1863 net/socket.c:1860 net/socket.c:1860) do_syscall_64 (arch/x86/entry/syscall_64.c:?) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Freed by task 496: kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78) kasan_save_free_info (mm/kasan/generic.c:587) __kasan_slab_free (mm/kasan/common.c:287) kmem_cache_free (mm/slub.c:6165) __sk_destruct (net/core/sock.c:2282 net/core/sock.c:2384) sk_psock_destroy (./include/net/sock.h:?) process_scheduled_works (kernel/workqueue.c:?) worker_thread (kernel/workqueue.c:?) kthread (kernel/kthread.c:438) ret_from_fork (arch/x86/kernel/process.c:164) ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c63829182c37c2d6d0608976d15fa61ebebe9e6b , < b34a1d83c74a124c968b5adb25c809db3e2eb86a (git)
Affected: c63829182c37c2d6d0608976d15fa61ebebe9e6b , < 965dc93481d1b80d341bdd16c27b16fe197175ee (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b34a1d83c74a124c968b5adb25c809db3e2eb86a",
              "status": "affected",
              "version": "c63829182c37c2d6d0608976d15fa61ebebe9e6b",
              "versionType": "git"
            },
            {
              "lessThan": "965dc93481d1b80d341bdd16c27b16fe197175ee",
              "status": "affected",
              "version": "c63829182c37c2d6d0608976d15fa61ebebe9e6b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Drop all SCM attributes for SOCKMAP.\n\nSOCKMAP can hide inflight fd from AF_UNIX GC.\n\nWhen a socket in SOCKMAP receives skb with inflight fd,\nsk_psock_verdict_data_ready() looks up the mapped socket and\nenqueue skb to its psock-\u003eingress_skb.\n\nSince neither the old nor the new GC can inspect the psock\nqueue, the hidden skb leaks the inflight sockets.  Note that\nthis cannot be detected via kmemleak because inflight sockets\nare linked to a global list.\n\nIn addition, SOCKMAP redirect breaks the Tarjan-based GC\u0027s\nassumption that unix_edge.successor is always alive, which\nis no longer true once skb is redirected, resulting in\nuse-after-free below. [0]\n\nMoreover, SOCKMAP does not call scm_stat_del() properly,\nso unix_show_fdinfo() could report an incorrect fd count.\n\nsk_msg_recvmsg() does not support any SCM attributes in the\nfirst place.\n\nLet\u0027s drop all SCM attributes before passing skb to the\nSOCKMAP layer.\n\n[0]:\nBUG: KASAN: slab-use-after-free in unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\nRead of size 8 at addr ffff888125362670 by task kworker/56:1/496\n\nCPU: 56 UID: 0 PID: 496 Comm: kworker/56:1 Not tainted 7.0.0-rc7-00263-gb9d8b856689d #3 PREEMPT(lazy)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\nWorkqueue: events sk_psock_backlog\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl (lib/dump_stack.c:122)\n print_report (mm/kasan/report.c:379)\n kasan_report (mm/kasan/report.c:597)\n unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\n unix_destroy_fpl (net/unix/garbage.c:317)\n unix_destruct_scm (./include/net/scm.h:80 ./include/net/scm.h:86 net/unix/af_unix.c:1976)\n sk_psock_backlog (./include/linux/skbuff.h:?)\n process_scheduled_works (kernel/workqueue.c:?)\n worker_thread (kernel/workqueue.c:?)\n kthread (kernel/kthread.c:438)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)\n \u003c/TASK\u003e\n\nAllocated by task 955:\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\n __kasan_slab_alloc (mm/kasan/common.c:369)\n kmem_cache_alloc_noprof (mm/slub.c:4539)\n sk_prot_alloc (net/core/sock.c:2240)\n sk_alloc (net/core/sock.c:2301)\n unix_create1 (net/unix/af_unix.c:1099)\n unix_create (net/unix/af_unix.c:1169)\n __sock_create (net/socket.c:1606)\n __sys_socketpair (net/socket.c:1811)\n __x64_sys_socketpair (net/socket.c:1863 net/socket.c:1860 net/socket.c:1860)\n do_syscall_64 (arch/x86/entry/syscall_64.c:?)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 496:\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\n kasan_save_free_info (mm/kasan/generic.c:587)\n __kasan_slab_free (mm/kasan/common.c:287)\n kmem_cache_free (mm/slub.c:6165)\n __sk_destruct (net/core/sock.c:2282 net/core/sock.c:2384)\n sk_psock_destroy (./include/net/sock.h:?)\n process_scheduled_works (kernel/workqueue.c:?)\n worker_thread (kernel/workqueue.c:?)\n kthread (kernel/kthread.c:438)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:37:55.507Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b34a1d83c74a124c968b5adb25c809db3e2eb86a"
        },
        {
          "url": "https://git.kernel.org/stable/c/965dc93481d1b80d341bdd16c27b16fe197175ee"
        }
      ],
      "title": "af_unix: Drop all SCM attributes for SOCKMAP.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53005",
    "datePublished": "2026-06-24T16:29:16.901Z",
    "dateReserved": "2026-06-09T07:44:35.377Z",
    "dateUpdated": "2026-06-28T06:37:55.507Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53005",
      "date": "2026-07-02",
      "epss": "0.00129",
      "percentile": "0.02901"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53005\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:11.637\",\"lastModified\":\"2026-06-28T08:16:29.190\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\naf_unix: Drop all SCM attributes for SOCKMAP.\\n\\nSOCKMAP can hide inflight fd from AF_UNIX GC.\\n\\nWhen a socket in SOCKMAP receives skb with inflight fd,\\nsk_psock_verdict_data_ready() looks up the mapped socket and\\nenqueue skb to its psock-\u003eingress_skb.\\n\\nSince neither the old nor the new GC can inspect the psock\\nqueue, the hidden skb leaks the inflight sockets.  Note that\\nthis cannot be detected via kmemleak because inflight sockets\\nare linked to a global list.\\n\\nIn addition, SOCKMAP redirect breaks the Tarjan-based GC\u0027s\\nassumption that unix_edge.successor is always alive, which\\nis no longer true once skb is redirected, resulting in\\nuse-after-free below. [0]\\n\\nMoreover, SOCKMAP does not call scm_stat_del() properly,\\nso unix_show_fdinfo() could report an incorrect fd count.\\n\\nsk_msg_recvmsg() does not support any SCM attributes in the\\nfirst place.\\n\\nLet\u0027s drop all SCM attributes before passing skb to the\\nSOCKMAP layer.\\n\\n[0]:\\nBUG: KASAN: slab-use-after-free in unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\\nRead of size 8 at addr ffff888125362670 by task kworker/56:1/496\\n\\nCPU: 56 UID: 0 PID: 496 Comm: kworker/56:1 Not tainted 7.0.0-rc7-00263-gb9d8b856689d #3 PREEMPT(lazy)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\\nWorkqueue: events sk_psock_backlog\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl (lib/dump_stack.c:122)\\n print_report (mm/kasan/report.c:379)\\n kasan_report (mm/kasan/report.c:597)\\n unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\\n unix_destroy_fpl (net/unix/garbage.c:317)\\n unix_destruct_scm (./include/net/scm.h:80 ./include/net/scm.h:86 net/unix/af_unix.c:1976)\\n sk_psock_backlog (./include/linux/skbuff.h:?)\\n process_scheduled_works (kernel/workqueue.c:?)\\n worker_thread (kernel/workqueue.c:?)\\n kthread (kernel/kthread.c:438)\\n ret_from_fork (arch/x86/kernel/process.c:164)\\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)\\n \u003c/TASK\u003e\\n\\nAllocated by task 955:\\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\\n __kasan_slab_alloc (mm/kasan/common.c:369)\\n kmem_cache_alloc_noprof (mm/slub.c:4539)\\n sk_prot_alloc (net/core/sock.c:2240)\\n sk_alloc (net/core/sock.c:2301)\\n unix_create1 (net/unix/af_unix.c:1099)\\n unix_create (net/unix/af_unix.c:1169)\\n __sock_create (net/socket.c:1606)\\n __sys_socketpair (net/socket.c:1811)\\n __x64_sys_socketpair (net/socket.c:1863 net/socket.c:1860 net/socket.c:1860)\\n do_syscall_64 (arch/x86/entry/syscall_64.c:?)\\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\\n\\nFreed by task 496:\\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\\n kasan_save_free_info (mm/kasan/generic.c:587)\\n __kasan_slab_free (mm/kasan/common.c:287)\\n kmem_cache_free (mm/slub.c:6165)\\n __sk_destruct (net/core/sock.c:2282 net/core/sock.c:2384)\\n sk_psock_destroy (./include/net/sock.h:?)\\n process_scheduled_works (kernel/workqueue.c:?)\\n worker_thread (kernel/workqueue.c:?)\\n kthread (kernel/kthread.c:438)\\n ret_from_fork (arch/x86/kernel/process.c:164)\\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/unix/af_unix.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c63829182c37c2d6d0608976d15fa61ebebe9e6b\",\"lessThan\":\"b34a1d83c74a124c968b5adb25c809db3e2eb86a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c63829182c37c2d6d0608976d15fa61ebebe9e6b\",\"lessThan\":\"965dc93481d1b80d341bdd16c27b16fe197175ee\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/unix/af_unix.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/965dc93481d1b80d341bdd16c27b16fe197175ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b34a1d83c74a124c968b5adb25c809db3e2eb86a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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

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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.