CVE-2023-53577 (GCVE-0-2023-53577)

Vulnerability from cvelistv5 – Published: 2025-10-04 15:17 – Updated: 2026-08-05 09:14
VLAI
Title
bpf, cpumap: Make sure kthread is running before map update returns
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, cpumap: Make sure kthread is running before map update returns The following warning was reported when running stress-mode enabled xdp_redirect_cpu with some RT threads: ------------[ cut here ]------------ WARNING: CPU: 4 PID: 65 at kernel/bpf/cpumap.c:135 CPU: 4 PID: 65 Comm: kworker/4:1 Not tainted 6.5.0-rc2+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: events cpu_map_kthread_stop RIP: 0010:put_cpu_map_entry+0xda/0x220 ...... Call Trace: <TASK> ? show_regs+0x65/0x70 ? __warn+0xa5/0x240 ...... ? put_cpu_map_entry+0xda/0x220 cpu_map_kthread_stop+0x41/0x60 process_one_work+0x6b0/0xb80 worker_thread+0x96/0x720 kthread+0x1a5/0x1f0 ret_from_fork+0x3a/0x70 ret_from_fork_asm+0x1b/0x30 </TASK> The root cause is the same as commit 436901649731 ("bpf: cpumap: Fix memory leak in cpu_map_update_elem"). The kthread is stopped prematurely by kthread_stop() in cpu_map_kthread_stop(), and kthread() doesn't call cpu_map_kthread_run() at all but XDP program has already queued some frames or skbs into ptr_ring. So when __cpu_map_ring_cleanup() checks the ptr_ring, it will find it was not emptied and report a warning. An alternative fix is to use __cpu_map_ring_cleanup() to drop these pending frames or skbs when kthread_stop() returns -EINTR, but it may confuse the user, because these frames or skbs have been handled correctly by XDP program. So instead of dropping these frames or skbs, just make sure the per-cpu kthread is running before __cpu_map_entry_alloc() returns. After apply the fix, the error handle for kthread_stop() will be unnecessary because it will always return 0, so just remove it.
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: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < b44d28b98f185d2f2348aa3c3636838c316f889e (git)
Affected: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < 7a1178a3671b40746830d355836b72e47ceb2490 (git)
Affected: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < ecb45b852af5e88257020b88bea5ff0798d72aca (git)
Affected: 6710e1126934d8b4372b4d2f9ae1646cd3f151bf , < 640a604585aa30f93e39b17d4d6ba69fcb1e66c9 (git)
Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.15.126 , ≤ 5.15.* (semver)
Unaffected: 6.1.45 , ≤ 6.1.* (semver)
Unaffected: 6.4.10 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cpumap: Make sure kthread is running before map update returns\n\nThe following warning was reported when running stress-mode enabled\nxdp_redirect_cpu with some RT threads:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 4 PID: 65 at kernel/bpf/cpumap.c:135\n  CPU: 4 PID: 65 Comm: kworker/4:1 Not tainted 6.5.0-rc2+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: events cpu_map_kthread_stop\n  RIP: 0010:put_cpu_map_entry+0xda/0x220\n  ......\n  Call Trace:\n   \u003cTASK\u003e\n   ? show_regs+0x65/0x70\n   ? __warn+0xa5/0x240\n   ......\n   ? put_cpu_map_entry+0xda/0x220\n   cpu_map_kthread_stop+0x41/0x60\n   process_one_work+0x6b0/0xb80\n   worker_thread+0x96/0x720\n   kthread+0x1a5/0x1f0\n   ret_from_fork+0x3a/0x70\n   ret_from_fork_asm+0x1b/0x30\n   \u003c/TASK\u003e\n\nThe root cause is the same as commit 436901649731 (\"bpf: cpumap: Fix memory\nleak in cpu_map_update_elem\"). The kthread is stopped prematurely by\nkthread_stop() in cpu_map_kthread_stop(), and kthread() doesn\u0027t call\ncpu_map_kthread_run() at all but XDP program has already queued some\nframes or skbs into ptr_ring. So when __cpu_map_ring_cleanup() checks\nthe ptr_ring, it will find it was not emptied and report a warning.\n\nAn alternative fix is to use __cpu_map_ring_cleanup() to drop these\npending frames or skbs when kthread_stop() returns -EINTR, but it may\nconfuse the user, because these frames or skbs have been handled\ncorrectly by XDP program. So instead of dropping these frames or skbs,\njust make sure the per-cpu kthread is running before\n__cpu_map_entry_alloc() returns.\n\nAfter apply the fix, the error handle for kthread_stop() will be\nunnecessary because it will always return 0, so just remove it."
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      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:55:33+00:00",
      "cve": "CVE-2023-53577",
      "id": "CVE-2023-53577",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "399",
      "product_status:known_affected": "38",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf, cpumap: Make sure kthread is running before map update returns",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53577.json",
      "version": "3"
    }
  }
}



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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.



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.