CVE-2026-90088
CVE CVE-2026-90088EUVD EUVD-2026-81949Published 2026-09-17T16:06:03.000Z
What the advisory describes
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().
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.1.188; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7c0aa45ae6c5a338661b23812bfcdef50bf3e96; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f561e44261344adadf9d6a6dff31e3af9776d5c6; patch: 7.2.6; patch: 6.6.157; 2.6.12; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aeee917a4878af95f0c63e18c5f22eaf6299c7b8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <44c98fd082eafd49d55a8a4077ff488175b2fe24; patch: 0; patch: 5.15.221; patch: 6.12.110; patch: 5.10.270; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc4851ff8dfb505e9a19efcc286712132bbd178d; patch: 6.18.52; patch: 7.3-rc1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b2e5f1928c99224345a9ed8c5dae5fc74964d6d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbc2962da99b6b89345267d3aa74b4b573340548; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3988cbb1be501dbff909a2ee024670e3c955a66d
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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