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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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-15T14:48:58+00:00",
      "cve": "CVE-2026-53035",
      "id": "CVE-2026-53035",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf, sockmap: Fix af_unix iter deadlock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53035.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T16:59:15Z",
      "cve": "CVE-2026-53035",
      "id": "CVE-2026-53035",
      "initial_release_date": "2026-06-26T02:13:03Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "221",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53035",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53035.json",
      "version": "16"
    }
  }
}



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Taxonomy of the tags.





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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.