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CVE-2026-74382 (GCVE-0-2026-74382)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:18
VLAI
Title
net/sched: cls_bpf: prevent unbounded recursion in offload rollback
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_bpf: prevent unbounded recursion in offload rollback Quan Sun reported [1] a stack overflow in cls_bpf_offload_cmd(). Reproducer on netdevsim: add a skip_sw cls_bpf filter, set the bpf_tc_accept debugfs knob to 0, then `tc filter replace`. The replace calls tc_setup_cb_replace() which fails. cls_bpf_offload_cmd() then swaps prog/oldprog and recursively calls itself to roll back. But bpf_tc_accept=0 makes the rollback fail too, which triggers yet another rollback frame with the same arguments, and so on until the stack is exhausted. bpf_tc_accept is just a convenient knob for the reproducer. Any driver whose tc_setup_cb_replace() fails twice in a row can hit the same loop, so this is not a netdevsim-only issue. Two ways to fix it: 1) Have the rollback call tc_setup_cb_add() on oldprog instead of re-entering cls_bpf_offload_cmd(). 2) Mark the rollback frame with a flag and skip a second-level rollback from inside it. Go with (2). It is the smaller change and keeps the original behaviour: the rollback still goes through tc_setup_cb_replace(), so the driver gets one real chance to restore its state. If that attempt also fails, we just return the original error instead of recursing. [1]: https://lore.kernel.org/bpf/ce5a6005-3c5e-4696-9e05-eba9461dc860@std.uestc.edu.cn/T/#u
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < a018f208ab7512380bd4cf670064d48cba00a1b1 (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < 33373e1f378a501bc51aa73312f74295c84e3101 (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7 (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < 4a76953c3ed043797e81529b9395e9ca6f4c7609 (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < 1387f252a242a51bfbb6eace29c8f8db21b457da (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < 10753da2d659dd425a6e620f47f86852d604f67f (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < 3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7 (git)
Affected: 102740bd9436a3a6ba129af3a48271d794009fa5 , < 27db54b90bcc7c37867fe664107fa25ea6a116e4 (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "dateReserved": "2026-08-15T05:44:03.890Z",
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T11:17:18+00:00",
      "cve": "CVE-2026-74382",
      "id": "CVE-2026-74382",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cls_bpf: prevent unbounded recursion in offload rollback",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74382.json",
      "version": "3"
    }
  }
}



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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.