Description (CNA)
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().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e7c0aa45ae6c5a338661b23812bfcdef50bf3e96; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cbc2962da99b6b89345267d3aa74b4b573340548; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fc4851ff8dfb505e9a19efcc286712132bbd178d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f561e44261344adadf9d6a6dff31e3af9776d5c6; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before aeee917a4878af95f0c63e18c5f22eaf6299c7b8; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3988cbb1be501dbff909a2ee024670e3c955a66d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 44c98fd082eafd49d55a8a4077ff488175b2fe24 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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