Bluetooth: eir: Fix OOB read in eir_get_service_data()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89583
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:42 UTC
Updated2026-09-11 20:19:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: eir: Fix OOB read in eir_get_service_data() eir_get_service_data() walks the advertising data for a Service Data field with a matching UUID. On a mismatch it advances: eir += dlen; eir_len -= dlen; eir_get_data() reports dlen as the field's data length, but the field spans dlen + 2 bytes once its length and type bytes count, and more when non-Service-Data fields were skipped to reach it. The pointer lands correctly on the next field. eir_len does not, and the shortfall compounds across fields until eir_get_data() reads the length and type bytes of a "field" past the end of the buffer. For an ISO broadcast sink that buffer is hcon->le_per_adv_data[], filled from the periodic advertising reports of a remote broadcaster. A PA payload packed with mismatching Service Data fields walks off the array into the rest of struct hci_conn. A drifted field that matches the BAA UUID puts those bytes in iso_pi(sk)->base, where user space reads them back with getsockopt(BT_ISO_BASE). Recompute eir_len from the end of the buffer each iteration.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063330000 (date 2026-09-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8f9ae5b3ae80f168a6224529e3787f4fb27f299a 815fc98c227a78cbd93d4c29f2833705b7c2bc0f git Not specified
CNA Linux Linux affected 8f9ae5b3ae80f168a6224529e3787f4fb27f299a c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50 git Not specified
CNA Linux Linux affected 8f9ae5b3ae80f168a6224529e3787f4fb27f299a bb56e97bd67614238c1c0a4084704ccadbb875b4 git Not specified
CNA Linux Linux affected 8f9ae5b3ae80f168a6224529e3787f4fb27f299a 4beb198bc59b242404a47c21990bc84165052c8a git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4beb198bc59b242404a47c21990bc84165052c8a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bb56e97bd67614238c1c0a4084704ccadbb875b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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