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CVE-2026-46086net: bridge: use a stable FDB dst snapshot in RCU readers

Description

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.

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 6 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-46086, by who scored it
Scored byCVSSScoreVector
NVDNVD · Undergoing Analysis3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.13% · top 97% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 960b589f86c74ce582922fcb996103271081f4de – < c502fa9f094cb03d1d1685c71e2105ab359bc2b8
    • affected 960b589f86c74ce582922fcb996103271081f4de – < a6ae4511c07b91f597e461406c6330f0d4ff810e
    • affected 960b589f86c74ce582922fcb996103271081f4de – < 1406c4e0ed1eaf8a29801ab1163d00fb7ee4359a
    • affected 960b589f86c74ce582922fcb996103271081f4de – < 0b9e4bbfb7c949151e3acd44ed4aa33614d2e110
    • affected 960b589f86c74ce582922fcb996103271081f4de – < 81af4137a30c4c2dc694dea8cacb180bd66000ef
    • affected 960b589f86c74ce582922fcb996103271081f4de – < 5424e678f9b304e148cf5dcc047cffc7a56a3bb5
    • affected 960b589f86c74ce582922fcb996103271081f4de – < 9a2d9d4e657b23dc21f24cf139e3aeff0b61341f
    • affected 960b589f86c74ce582922fcb996103271081f4de – < df4601653201de21b487c3e7fffd464790cab808

  • Linux · Linux

    • affected 3.14
    • unaffected < 3.14
    • unaffected 5.10.259 – ≤ 5.10.*
    • unaffected 5.15.210 – ≤ 5.15.*
    • unaffected 6.1.176 – ≤ 6.1.*
    • unaffected 6.6.140 – ≤ 6.6.*
    • unaffected 6.12.86 – ≤ 6.12.*
    • unaffected 6.18.27 – ≤ 6.18.*
    • unaffected 7.0.4 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

References11

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .