CVE-2021-47496 (GCVE-0-2021-47496)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-11 13:55
VLAI?
Title
net/tls: Fix flipped sign in tls_err_abort() calls
Summary
In the Linux kernel, the following vulnerability has been resolved: net/tls: Fix flipped sign in tls_err_abort() calls sk->sk_err appears to expect a positive value, a convention that ktls doesn't always follow and that leads to memory corruption in other code. For instance, [kworker] tls_encrypt_done(..., err=<negative error from crypto request>) tls_err_abort(.., err) sk->sk_err = err; [task] splice_from_pipe_feed ... tls_sw_do_sendpage if (sk->sk_err) { ret = -sk->sk_err; // ret is positive splice_from_pipe_feed (continued) ret = actor(...) // ret is still positive and interpreted as bytes // written, resulting in underflow of buf->len and // sd->len, leading to huge buf->offset and bogus // addresses computed in later calls to actor() Fix all tls_err_abort() callers to pass a negative error code consistently and centralize the error-prone sign flip there, throwing in a warning to catch future misuse and uninlining the function so it really does only warn once.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c46234ebb4d1eee5e09819f49169e51cfc6eb909 , < e0cfd5159f314d6b304d030363650b06a2299cbb (git)
Affected: c46234ebb4d1eee5e09819f49169e51cfc6eb909 , < f3dec7e7ace38224f82cf83f0049159d067c2e19 (git)
Affected: c46234ebb4d1eee5e09819f49169e51cfc6eb909 , < e41473543f75f7dbc5d605007e6f883f1bd13b9a (git)
Affected: c46234ebb4d1eee5e09819f49169e51cfc6eb909 , < da353fac65fede6b8b4cfe207f0d9408e3121105 (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.4.157 , ≤ 5.4.* (semver)
Unaffected: 5.10.77 , ≤ 5.10.* (semver)
Unaffected: 5.14.16 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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}


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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.