CVE-2026-46086 (GCVE-0-2026-46086)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:58 – Updated: 2026-06-19 11:59
VLAI
Title
net: bridge: use a stable FDB dst snapshot in RCU readers
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by `fdb_delete_local()`, which updates `f->dst` to another port or to `NULL` while keeping the entry alive. Several bridge RCU readers inspect `f->dst`, including `br_fdb_fillbuf()` through the `brforward_read()` sysfs path. These readers currently load `f->dst` multiple times and can therefore observe inconsistent values across the check and later dereference. In `br_fdb_fillbuf()`, this means a concurrent local-FDB update can change `f->dst` after the NULL check and before the `port_no` dereference, leading to a NULL-ptr-deref. Fix this by taking a single `READ_ONCE()` snapshot of `f->dst` in each affected RCU reader and using that snapshot for the rest of the access sequence. Also publish the in-place `f->dst` updates in `fdb_delete_local()` with `WRITE_ONCE()` so the readers and writer use matching access patterns.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 960b589f86c74ce582922fcb996103271081f4de , < c502fa9f094cb03d1d1685c71e2105ab359bc2b8 (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < a6ae4511c07b91f597e461406c6330f0d4ff810e (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < 1406c4e0ed1eaf8a29801ab1163d00fb7ee4359a (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < 0b9e4bbfb7c949151e3acd44ed4aa33614d2e110 (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < 81af4137a30c4c2dc694dea8cacb180bd66000ef (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < 5424e678f9b304e148cf5dcc047cffc7a56a3bb5 (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < 9a2d9d4e657b23dc21f24cf139e3aeff0b61341f (git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < df4601653201de21b487c3e7fffd464790cab808 (git)
Create a notification for this product.
Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

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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.

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Detection rules are retrieved from Rulezet.

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