CVE-2026-43205 (GCVE-0-2026-43205)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-06 11:28
VLAI?
Title
dpaa2-switch: validate num_ifs to prevent out-of-bounds write
Summary
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: validate num_ifs to prevent out-of-bounds write The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes() but never validates it against DPSW_MAX_IF (64). This value controls iteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices into the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports num_ifs >= 64, the loop can write past the array bounds. Add a bound check for num_ifs in dpaa2_switch_init(). dpaa2_switch_fdb_get_flood_cfg() appends the control interface (port num_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all ports match the flood filter, the loop fills all 64 slots and the control interface write overflows by one entry. The check uses >= because num_ifs == DPSW_MAX_IF is also functionally broken. build_if_id_bitmap() silently drops any ID >= 64: if (id[i] < DPSW_MAX_IF) bmap[id[i] / 64] |= ...
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < a26dda3bae469c8e4e1b1993ad33dafa32d0fc28 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < a3034a8d56174dd6464c46823438f25797910a8d (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < b690635d4719214892855b79ce018d4b1672ac96 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 8b841fd529db9faf8bc678d429d4bf4e98b10900 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 89764cf44544e943230f5e03b8c40a90da26537c (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < c18493f750208eb4ff1198fc5a02786b8b2d70a6 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 8a5752c6dcc085a3bfc78589925182e4e98468c5 (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: validate num_ifs to prevent out-of-bounds write\n\nThe driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes()\nbut never validates it against DPSW_MAX_IF (64). This value controls\niteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices\ninto the fixed-size cfg-\u003eif_id[DPSW_MAX_IF] array. When firmware reports\nnum_ifs \u003e= 64, the loop can write past the array bounds.\n\nAdd a bound check for num_ifs in dpaa2_switch_init().\n\ndpaa2_switch_fdb_get_flood_cfg() appends the control interface (port\nnum_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all\nports match the flood filter, the loop fills all 64 slots and the control\ninterface write overflows by one entry.\n\nThe check uses \u003e= because num_ifs == DPSW_MAX_IF is also functionally\nbroken.\n\nbuild_if_id_bitmap() silently drops any ID \u003e= 64:\n      if (id[i] \u003c DPSW_MAX_IF)\n          bmap[id[i] / 64] |= ..."
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    "dateReserved": "2026-05-01T14:12:55.992Z",
    "dateUpdated": "2026-05-06T11:28:10.270Z",
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  }
}


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  • 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.
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  • 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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