Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.22 % · percentile 12 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop rfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter Negotiation) frame without checking for zero. When the remote peer sends an MTU of zero, d->mtu is set to 0. This causes the sendmsg path to enter an infinite loop when fragmenting data, as each fragment has size == min_t(size_t, len, 0) == 0, so the remaining length never decreases. The infinite allocation of zero-length skbs exhausts all system memory. Fix by clamping d->mtu to RFCOMM_DEFAULT_MTU when the negotiated value is zero, consistent with the initial value assigned in rfcomm_dlc_alloc().
References
- https://git.kernel.org/stable/c/e7c0aa45ae6c5a338661b23812bfcdef50bf3e96
- https://git.kernel.org/stable/c/cbc2962da99b6b89345267d3aa74b4b573340548
- https://git.kernel.org/stable/c/9b2e5f1928c99224345a9ed8c5dae5fc74964d6d
- https://git.kernel.org/stable/c/fc4851ff8dfb505e9a19efcc286712132bbd178d
- https://git.kernel.org/stable/c/f561e44261344adadf9d6a6dff31e3af9776d5c6
- https://git.kernel.org/stable/c/aeee917a4878af95f0c63e18c5f22eaf6299c7b8
- https://git.kernel.org/stable/c/3988cbb1be501dbff909a2ee024670e3c955a66d
- https://git.kernel.org/stable/c/44c98fd082eafd49d55a8a4077ff488175b2fe24
European references
- ENISA EUVD · EUVD-2026-81949
- GCVE · GCVE-0-2026-90088
CERT-FR advisories
- CERTFR-2026-AVI-1432 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1372 — Multiples vulnérabilités dans les produits SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1335 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e7c0aa45ae6c5a338661b23812bfcdef50bf3e96 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbc2962da99b6b89345267d3aa74b4b573340548 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fc4851ff8dfb505e9a19efcc286712132bbd178d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f561e44261344adadf9d6a6dff31e3af9776d5c6 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < aeee917a4878af95f0c63e18c5f22eaf6299c7b8 |
| Linux · Linux | affected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 5.10.270 ≤ 5.10.* ; unaffected 5.15.221 ≤ 5.15.* ; unaffected 6.1.188 ≤ 6.1.* ; unaffected 6.6.157 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |