CVE-2026-53035 (GCVE-0-2026-53035)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
bpf, sockmap: Fix af_unix iter deadlock
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix af_unix iter deadlock bpf_iter_unix_seq_show() may deadlock when lock_sock_fast() takes the fast path and the iter prog attempts to update a sockmap. Which ends up spinning at sock_map_update_elem()'s bh_lock_sock(): WARNING: possible recursive locking detected test_progs/1393 is trying to acquire lock: ffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: sock_map_update_elem+0xdb/0x1f0 but task is already holding lock: ffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_UNIX); lock(slock-AF_UNIX); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by test_progs/1393: #0: ffff88814b59c790 (&p->lock){+.+.}-{4:4}, at: bpf_seq_read+0x59/0x10d0 #1: ffff88811ec25fd8 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: bpf_seq_read+0x42c/0x10d0 #2: ffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0 #3: ffffffff85a6a7c0 (rcu_read_lock){....}-{1:3}, at: bpf_iter_run_prog+0x51d/0xb00 Call Trace: dump_stack_lvl+0x5d/0x80 print_deadlock_bug.cold+0xc0/0xce __lock_acquire+0x130f/0x2590 lock_acquire+0x14e/0x2b0 _raw_spin_lock+0x30/0x40 sock_map_update_elem+0xdb/0x1f0 bpf_prog_2d0075e5d9b721cd_dump_unix+0x55/0x4f4 bpf_iter_run_prog+0x5b9/0xb00 bpf_iter_unix_seq_show+0x1f7/0x2e0 bpf_seq_read+0x42c/0x10d0 vfs_read+0x171/0xb20 ksys_read+0xff/0x200 do_syscall_64+0x6b/0x3a0 entry_SYSCALL_64_after_hwframe+0x76/0x7e
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2c860a43dd77f969bb959336a2f743d7103a8f63 , < bd3592129f24243713673a07225cf1f15a9bb835 (git)
Affected: 2c860a43dd77f969bb959336a2f743d7103a8f63 , < 3cef33b9813b78f227942572fb317afcd5c9ac94 (git)
Affected: 2c860a43dd77f969bb959336a2f743d7103a8f63 , < 87828b380956d4986f59f2c086e0b09b3e6cdaae (git)
Affected: 2c860a43dd77f969bb959336a2f743d7103a8f63 , < 527057ebe8076dfbcaef51195ff1b7508646be2c (git)
Affected: 2c860a43dd77f969bb959336a2f743d7103a8f63 , < 66d9fab4565eafe1afe7ba0581f79b76073b60fa (git)
Affected: 2c860a43dd77f969bb959336a2f743d7103a8f63 , < 4d328dd695383224aa750ddee6b4ad40c0f8d205 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/unix/af_unix.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.15"
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              "version": "7.0.10",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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                  "vulnerable": true
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix af_unix iter deadlock\n\nbpf_iter_unix_seq_show() may deadlock when lock_sock_fast() takes the fast\npath and the iter prog attempts to update a sockmap. Which ends up spinning\nat sock_map_update_elem()\u0027s bh_lock_sock():\n\nWARNING: possible recursive locking detected\ntest_progs/1393 is trying to acquire lock:\nffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: sock_map_update_elem+0xdb/0x1f0\n\nbut task is already holding lock:\nffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n       CPU0\n       ----\n  lock(slock-AF_UNIX);\n  lock(slock-AF_UNIX);\n\n *** DEADLOCK ***\n\n May be due to missing lock nesting notation\n\n4 locks held by test_progs/1393:\n #0: ffff88814b59c790 (\u0026p-\u003elock){+.+.}-{4:4}, at: bpf_seq_read+0x59/0x10d0\n #1: ffff88811ec25fd8 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: bpf_seq_read+0x42c/0x10d0\n #2: ffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0\n #3: ffffffff85a6a7c0 (rcu_read_lock){....}-{1:3}, at: bpf_iter_run_prog+0x51d/0xb00\n\nCall Trace:\n dump_stack_lvl+0x5d/0x80\n print_deadlock_bug.cold+0xc0/0xce\n __lock_acquire+0x130f/0x2590\n lock_acquire+0x14e/0x2b0\n _raw_spin_lock+0x30/0x40\n sock_map_update_elem+0xdb/0x1f0\n bpf_prog_2d0075e5d9b721cd_dump_unix+0x55/0x4f4\n bpf_iter_run_prog+0x5b9/0xb00\n bpf_iter_unix_seq_show+0x1f7/0x2e0\n bpf_seq_read+0x42c/0x10d0\n vfs_read+0x171/0xb20\n ksys_read+0xff/0x200\n do_syscall_64+0x6b/0x3a0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:42.560Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/bd3592129f24243713673a07225cf1f15a9bb835"
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          "url": "https://git.kernel.org/stable/c/3cef33b9813b78f227942572fb317afcd5c9ac94"
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          "url": "https://git.kernel.org/stable/c/87828b380956d4986f59f2c086e0b09b3e6cdaae"
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          "url": "https://git.kernel.org/stable/c/527057ebe8076dfbcaef51195ff1b7508646be2c"
        },
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          "url": "https://git.kernel.org/stable/c/66d9fab4565eafe1afe7ba0581f79b76073b60fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d328dd695383224aa750ddee6b4ad40c0f8d205"
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      "title": "bpf, sockmap: Fix af_unix iter deadlock",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53035",
    "datePublished": "2026-06-24T16:29:42.560Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-06-24T16:29:42.560Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53035",
      "date": "2026-07-02",
      "epss": "0.00172",
      "percentile": "0.06895"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53035\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:14.990\",\"lastModified\":\"2026-06-24T17:17:14.990\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf, sockmap: Fix af_unix iter deadlock\\n\\nbpf_iter_unix_seq_show() may deadlock when lock_sock_fast() takes the fast\\npath and the iter prog attempts to update a sockmap. Which ends up spinning\\nat sock_map_update_elem()\u0027s bh_lock_sock():\\n\\nWARNING: possible recursive locking detected\\ntest_progs/1393 is trying to acquire lock:\\nffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: sock_map_update_elem+0xdb/0x1f0\\n\\nbut task is already holding lock:\\nffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0\\n\\nother info that might help us debug this:\\n Possible unsafe locking scenario:\\n\\n       CPU0\\n       ----\\n  lock(slock-AF_UNIX);\\n  lock(slock-AF_UNIX);\\n\\n *** DEADLOCK ***\\n\\n May be due to missing lock nesting notation\\n\\n4 locks held by test_progs/1393:\\n #0: ffff88814b59c790 (\u0026p-\u003elock){+.+.}-{4:4}, at: bpf_seq_read+0x59/0x10d0\\n #1: ffff88811ec25fd8 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: bpf_seq_read+0x42c/0x10d0\\n #2: ffff88811ec25f58 (slock-AF_UNIX){+...}-{3:3}, at: __lock_sock_fast+0x37/0xe0\\n #3: ffffffff85a6a7c0 (rcu_read_lock){....}-{1:3}, at: bpf_iter_run_prog+0x51d/0xb00\\n\\nCall Trace:\\n dump_stack_lvl+0x5d/0x80\\n print_deadlock_bug.cold+0xc0/0xce\\n __lock_acquire+0x130f/0x2590\\n lock_acquire+0x14e/0x2b0\\n _raw_spin_lock+0x30/0x40\\n sock_map_update_elem+0xdb/0x1f0\\n bpf_prog_2d0075e5d9b721cd_dump_unix+0x55/0x4f4\\n bpf_iter_run_prog+0x5b9/0xb00\\n bpf_iter_unix_seq_show+0x1f7/0x2e0\\n bpf_seq_read+0x42c/0x10d0\\n vfs_read+0x171/0xb20\\n ksys_read+0xff/0x200\\n do_syscall_64+0x6b/0x3a0\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\"}],\"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\":\"2c860a43dd77f969bb959336a2f743d7103a8f63\",\"lessThan\":\"bd3592129f24243713673a07225cf1f15a9bb835\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2c860a43dd77f969bb959336a2f743d7103a8f63\",\"lessThan\":\"3cef33b9813b78f227942572fb317afcd5c9ac94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2c860a43dd77f969bb959336a2f743d7103a8f63\",\"lessThan\":\"87828b380956d4986f59f2c086e0b09b3e6cdaae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2c860a43dd77f969bb959336a2f743d7103a8f63\",\"lessThan\":\"527057ebe8076dfbcaef51195ff1b7508646be2c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2c860a43dd77f969bb959336a2f743d7103a8f63\",\"lessThan\":\"66d9fab4565eafe1afe7ba0581f79b76073b60fa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2c860a43dd77f969bb959336a2f743d7103a8f63\",\"lessThan\":\"4d328dd695383224aa750ddee6b4ad40c0f8d205\",\"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\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3cef33b9813b78f227942572fb317afcd5c9ac94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4d328dd695383224aa750ddee6b4ad40c0f8d205\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/527057ebe8076dfbcaef51195ff1b7508646be2c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66d9fab4565eafe1afe7ba0581f79b76073b60fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87828b380956d4986f59f2c086e0b09b3e6cdaae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd3592129f24243713673a07225cf1f15a9bb835\",\"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.