CVE-2024-26585 (GCVE-0-2024-26585)

Vulnerability from cvelistv5 – Published: 2024-02-21 14:59 – Updated: 2026-08-05 11:26
VLAI
Title
tls: fix race between tx work scheduling and socket close
Summary
In the Linux kernel, the following vulnerability has been resolved: tls: fix race between tx work scheduling and socket close Similarly to previous commit, the submitting thread (recvmsg/sendmsg) may exit as soon as the async crypto handler calls complete(). Reorder scheduling the work before calling complete(). This seems more logical in the first place, as it's the inverse order of what the submitting thread will do.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a42055e8d2c30d4decfc13ce943d09c7b9dad221 , < dd32621f19243f89ce830919496a5dcc2158aa33 (git)
Affected: a42055e8d2c30d4decfc13ce943d09c7b9dad221 , < 196f198ca6fce04ba6ce262f5a0e4d567d7d219d (git)
Affected: a42055e8d2c30d4decfc13ce943d09c7b9dad221 , < 6db22d6c7a6dc914b12c0469b94eb639b6a8a146 (git)
Affected: a42055e8d2c30d4decfc13ce943d09c7b9dad221 , < e327ed60bff4a991cd7a709c47c4f0c5b4a4fd57 (git)
Affected: a42055e8d2c30d4decfc13ce943d09c7b9dad221 , < e01e3934a1b2d122919f73bc6ddbe1cdafc4bbdb (git)
Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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No local access to the target is needed.\\nAC:L - The attacker controls both sides of the race \\u2014 one side issues the sendmsg that leaves an async encryption in flight, the other issues the close that blocks in tls_encrypt_async_wait() and then frees ctx \\u2014 and can retry across thousands of concurrent connections at no cost. No memory layout or victim state outside the attacker\u0027s influence is required.\\nPR:N - A kTLS-offloading HTTPS server accepts connections from arbitrary unauthenticated clients with no client certificate in the typical deployment; locally, setsockopt(TCP_ULP,\\\"tls\\\") plus TLS_TX requires no capability at all once the tls module is loaded. Neither path needs an account or privilege on the target.\\nUI:N - The race fires during ordinary kTLS record encryption and socket teardown on an established connection. No action by any local user or administrator is required.\\nS:U - The use-after-free on struct tls_sw_context_tx and the resulting timer/workqueue corruption all occur in kernel memory managed by the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\\nC:H - After kfree(ctx) the callback and the later timer expiry re-read freed, attacker-groomable memory \\u2014 timer-\u003efunction, dwork-\u003ewq, and tx_work-\u003esk, the last of which is dereferenced as a struct sock * by tx_work_handler/tls_tx_records. Controlling that fake sock and the redirected call is leverageable into arbitrary kernel memory disclosure.\\nI:H - The stale callback performs an atomic bit-set into the reallocated slab object at a fixed offset and writes dwork-\u003ewq, dwork-\u003ecpu and timer-\u003eexpires into freed memory, then links that freed object into the global timer wheel. That yields a controlled heap write plus a function pointer read from reclaimed memory, i.e. a control-flow hijack primitive.\\nA:H - Arming a delayed_work inside a freed slab object after cancel_delayed_work_sync() reliably produces slab and timer-wheel corruption, and tx_work_handler running against an already-freed TLS context oopses on the stale sk. 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      "cveMetadata": "{\"cveId\": \"CVE-2024-26585\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:26:04.351Z\", \"dateReserved\": \"2024-02-19T14:20:24.125Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-21T14:59:13.088Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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.