CVE-2023-54193

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-12-30. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

net/sched: cls_api: remove block_cb from driver_list before freeing

Error handler of tcf_block_bind() frees the whole bo->cb_list on error. However, by that time the flow_block_cb instances are already in the driver list because driver ndo_setup_tc() callback is called before that up the call chain in tcf_block_offload_cmd(). This leaves dangling pointers to freed objects in the list and causes use-after-free[0]. Fix it by also removing flow_block_cb instances from driver_list before deallocating them.

[0]: [ 279.868433] ================================================================== [ 279.869964] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x631/0x7c0 [ 279.871527] Read of size 8 at addr ffff888147e2bf20 by task tc/2963

[ 279.873151] CPU: 6 PID: 2963 Comm: tc Not tainted 6.3.0-rc6+ #4 [ 279.874273] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 279.876295] Call Trace: [ 279.876882] [ 279.877413] dump_stack_lvl+0x33/0x50 [ 279.878198] print_report+0xc2/0x610 [ 279.878987] ? flow_block_cb_setup_simple+0x631/0x7c0 [ 279.879994] kasan_report+0xae/0xe0 [ 279.880750] ? flow_block_cb_setup_simple+0x631/0x7c0 [ 279.881744] ? mlx5e_tc_reoffload_flows_work+0x240/0x240 [mlx5_core] [ 279.883047] flow_block_cb_setup_simple+0x631/0x7c0 [ 279.884027] tcf_block_offload_cmd.isra.0+0x189/0x2d0 [ 279.885037] ? tcf_block_setup+0x6b0/0x6b0 [ 279.885901] ? mutex_lock+0x7d/0xd0 [ 279.886669] ? __mutex_unlock_slowpath.constprop.0+0x2d0/0x2d0 [ 279.887844] ? ingress_init+0x1c0/0x1c0 [sch_ingress] [ 279.888846] tcf_block_get_ext+0x61c/0x1200 [ 279.889711] ingress_init+0x112/0x1c0 [sch_ingress] [ 279.890682] ? clsact_init+0x2b0/0x2b0 [sch_ingress] [ 279.891701] qdisc_create+0x401/0xea0 [ 279.892485] ? qdisc_tree_reduce_backlog+0x470/0x470 [ 279.893473] tc_modify_qdisc+0x6f7/0x16d0 [ 279.894344] ? tc_get_qdisc+0xac0/0xac0 [ 279.895213] ? mutex_lock+0x7d/0xd0 [ 279.896005] ? __mutex_lock_slowpath+0x10/0x10 [ 279.896910] rtnetlink_rcv_msg+0x5fe/0x9d0 [ 279.897770] ? rtnl_calcit.isra.0+0x2b0/0x2b0 [ 279.898672] ? __sys_sendmsg+0xb5/0x140 [ 279.899494] ? do_syscall_64+0x3d/0x90 [ 279.900302] ? entry_SYSCALL_64_after_hwframe+0x46/0xb0 [ 279.901337] ? kasan_save_stack+0x2e/0x40 [ 279.902177] ? kasan_save_stack+0x1e/0x40 [ 279.903058] ? kasan_set_track+0x21/0x30 [ 279.903913] ? kasan_save_free_info+0x2a/0x40 [ 279.904836] ? ____kasan_slab_free+0x11a/0x1b0 [ 279.905741] ? kmem_cache_free+0x179/0x400 [ 279.906599] netlink_rcv_skb+0x12c/0x360 [ 279.907450] ? rtnl_calcit.isra.0+0x2b0/0x2b0 [ 279.908360] ? netlink_ack+0x1550/0x1550 [ 279.909192] ? rhashtable_walk_peek+0x170/0x170 [ 279.910135] ? kmem_cache_alloc_node+0x1af/0x390 [ 279.911086] ? _copy_from_iter+0x3d6/0xc70 [ 279.912031] netlink_unicast+0x553/0x790 [ 279.912864] ? netlink_attachskb+0x6a0/0x6a0 [ 279.913763] ? netlink_recvmsg+0x416/0xb50 [ 279.914627] netlink_sendmsg+0x7a1/0xcb0 [ 279.915473] ? netlink_unicast+0x790/0x790 [ 279.916334] ? iovec_from_user.part.0+0x4d/0x220 [ 279.917293] ? netlink_unicast+0x790/0x790 [ 279.918159] sock_sendmsg+0xc5/0x190 [ 279.918938] ____sys_sendmsg+0x535/0x6b0 [ 279.919813] ? import_iovec+0x7/0x10 [ 279.920601] ? kernel_sendmsg+0x30/0x30 [ 279.921423] ? __copy_msghdr+0x3c0/0x3c0 [ 279.922254] ? import_iovec+0x7/0x10 [ 279.923041] ___sys_sendmsg+0xeb/0x170 [ 279.923854] ? copy_msghdr_from_user+0x110/0x110 [ 279.924797] ? ___sys_recvmsg+0xd9/0x130 [ 279.925630] ? __perf_event_task_sched_in+0x183/0x470 [ 279.926656] ? ___sys_sendmsg+0x170/0x170 [ 279.927529] ? ctx_sched_in+0x530/0x530 [ 279.928369] ? update_curr+0x283/0x4f0 [ 279.929185] ? perf_event_update_userpage+0x570/0x570 [ 279.930201] ? __fget_light+0x57/0x520 [ 279.931023] ? __switch_to+0x53d/0xe70 [ 27 ---truncated---

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

December 30, 2025

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/da94a7781fc3c92e7df7832bc2746f4d39bc624e
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cc5fe387c6294d0471cb7ed064efac97fac65ccc
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cb145932fcf6814e7e95e467eb70e7849a845ae9
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7b7a74ed303d532fb73ae4b1697f16a0fea89cd0
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7311c8be3755611bf6edea4dfbeb190b4bdd489f
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/55866fe3fded3ce94ac3fc1bb3dfce654282f483
generic

net/sched: cls_api: remove block_cb from driver_list before freeing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/26aec72429a05e917d574eca0efc5306c63a8862

Vendor Advisories for CVE-2023-54193(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.4.243—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (33 versions)5.10.191-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.27-16.1.37-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—6.3.7-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—6.3.7-1—

Data Freshness Timeline

(refreshed 7× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 193 total refreshes for this CVE.

  1. 2026-09-20 20:14 UTCEPSS rescore
  2. 2026-09-20 20:14 UTCEPSS rescore
  3. 2026-09-19 21:50 UTCOSV refresh
  4. 2026-09-18 19:26 UTCEPSS rescore
  5. 2026-09-16 14:06 UTCEPSS rescore
  6. 2026-09-16 05:11 UTCEPSS rescore
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  8. 2026-09-15 03:08 UTCEPSS rescore
  9. 2026-09-13 16:45 UTCEPSS rescore
  10. 2026-09-12 14:58 UTCEPSS rescore
  11. 2026-09-11 14:51 UTCEPSS rescore
  12. 2026-09-11 09:34 UTCEPSS rescore
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  14. 2026-09-07 15:59 UTCEPSS rescore
  15. 2026-09-06 13:46 UTCEPSS rescore
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  19. 2026-09-02 14:10 UTCEPSS rescore
  20. 2026-09-01 13:52 UTCEPSS rescore
  21. 2026-09-01 04:36 UTCEPSS rescore
  22. 2026-09-01 01:04 UTCOSV refresh
  23. 2026-08-30 19:15 UTCEPSS rescore
  24. 2026-08-30 01:20 UTCEPSS rescore
  25. 2026-08-28 21:39 UTCEPSS rescore
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  1. 2026-08-27 14:23 UTCEPSS rescore
  2. 2026-08-26 14:44 UTCEPSS rescore
  3. 2026-08-25 13:47 UTCEPSS rescore
  4. 2026-08-23 00:17 UTCEPSS rescore
  5. 2026-08-23 00:17 UTCEPSS rescore
  6. 2026-08-21 23:47 UTCEPSS rescore
  7. 2026-08-20 22:53 UTCEPSS rescore
  8. 2026-08-19 17:02 UTCEPSS rescore
  9. 2026-08-18 13:46 UTCEPSS rescore
  10. 2026-08-16 14:54 UTCEPSS rescore
  11. 2026-08-16 02:12 UTCEPSS rescore
  12. 2026-08-15 01:28 UTCEPSS rescore
  13. 2026-08-15 01:09 UTCEG score recompute
  14. 2026-08-15 01:09 UTCGHSA enrichment
  15. 2026-08-13 21:58 UTCEPSS rescore
  16. 2026-08-12 13:49 UTCEPSS rescore
  17. 2026-08-11 13:40 UTCEPSS rescore
  18. 2026-08-10 23:58 UTCEPSS rescore
  19. 2026-08-09 22:23 UTCEG score recompute
  20. 2026-08-09 22:23 UTCGHSA enrichment
  21. 2026-08-09 13:44 UTCEPSS rescore
  22. 2026-08-08 16:35 UTCEPSS rescore
  23. 2026-08-08 04:35 UTCEG score recompute
  24. 2026-08-08 04:35 UTCGHSA enrichment
  25. 2026-08-07 16:25 UTCEPSS rescore
  26. 2026-08-06 13:45 UTCEPSS rescore
  27. 2026-08-06 06:46 UTCEG score recompute
  28. 2026-08-06 06:46 UTCGHSA enrichment
  29. 2026-08-05 19:15 UTCEPSS rescore
  30. 2026-08-05 19:15 UTCEPSS rescore
  31. 2026-08-05 10:12 UTCEG score recompute
  32. 2026-08-05 10:12 UTCGHSA enrichment
  33. 2026-08-04 11:27 UTCEG score recompute
  34. 2026-08-04 11:27 UTCGHSA enrichment
  35. 2026-08-04 10:36 UTCEPSS rescore
  36. 2026-08-04 10:21 UTCEG score recompute▲ 7.80
  37. 2026-08-04 10:21 UTCGHSA enrichment
  38. 2026-08-04 10:19 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  39. 2026-08-03 10:34 UTCEPSS rescore
  40. 2026-08-02 02:25 UTCEPSS rescore
  41. 2026-08-02 02:25 UTCEPSS rescore
  42. 2026-08-01 04:14 UTCEPSS rescore
  43. 2026-07-30 16:26 UTCEPSS rescore
  44. 2026-07-30 01:29 UTCEPSS rescore
  45. 2026-07-28 15:34 UTCEPSS rescore
  46. 2026-07-28 15:34 UTCEPSS rescore
  47. 2026-07-27 03:09 UTCOSV refresh
  48. 2026-07-26 14:53 UTCEPSS rescore
  49. 2026-07-25 14:16 UTCEPSS rescore
  50. 2026-07-24 14:16 UTCEPSS rescore
  51. 2026-07-23 14:16 UTCEPSS rescore
  52. 2026-07-23 02:30 UTCEG score recompute
  53. 2026-07-22 23:16 UTCEG score recompute
  54. 2026-07-22 14:07 UTCEPSS rescore
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  56. 2026-07-21 15:23 UTCEPSS rescore
  57. 2026-07-20 17:06 UTCEPSS rescore
  58. 2026-07-19 14:30 UTCEPSS rescore
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  60. 2026-07-19 02:27 UTCEPSS rescore
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  62. 2026-07-18 10:03 UTCEPSS rescore
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  64. 2026-07-16 17:01 UTCEPSS rescore
  65. 2026-07-15 16:56 UTCEPSS rescore
  66. 2026-07-15 01:59 UTCEPSS rescore
  67. 2026-07-15 01:59 UTCEPSS rescore
  68. 2026-07-13 22:28 UTCEPSS rescore
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  70. 2026-07-13 06:11 UTCEPSS rescore
  71. 2026-07-12 05:45 UTCEPSS rescore
  72. 2026-07-12 05:45 UTCEPSS rescore
  73. 2026-07-11 08:26 UTCEPSS rescore
  74. 2026-07-09 21:45 UTCOSV refresh
  75. 2026-07-09 19:08 UTCEPSS rescore

Related CVEs(same product)

Frequently asked(5)

What is CVE-2023-54193?
CVE-2023-54193 is a high vulnerability published on December 30, 2025. In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: remove blockcb from driver_list before freeing Error handler of tcfblockbind() frees the whole bo->cb_list on error. However, by that time the flowblockcb instances are already in the driver list because driver…
When was CVE-2023-54193 disclosed?
CVE-2023-54193 was first published in the National Vulnerability Database on December 30, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-54193 actively exploited?
CVE-2023-54193 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.8% of all scored CVEs.
What is the CVSS score of CVE-2023-54193?
CVE-2023-54193 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2023-54193?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-54193, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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