dpaa2-switch: validate num_ifs to prevent out-of-bounds write

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Summary

CVECVE-2026-43205
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:39 UTC
Updated2026-05-11 19:59:54 UTC
DescriptionIn 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] |= ...

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-787

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de a26dda3bae469c8e4e1b1993ad33dafa32d0fc28 git Not specified
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de a3034a8d56174dd6464c46823438f25797910a8d git Not specified
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de b690635d4719214892855b79ce018d4b1672ac96 git Not specified
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de 8b841fd529db9faf8bc678d429d4bf4e98b10900 git Not specified
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de 89764cf44544e943230f5e03b8c40a90da26537c git Not specified
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de c18493f750208eb4ff1198fc5a02786b8b2d70a6 git Not specified
CNA Linux Linux affected 539dda3c5d190c5088b5e57944b1b482fcb464de 8a5752c6dcc085a3bfc78589925182e4e98468c5 git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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