{"id":"CVE-2026-90088","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop\n\nrfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter\nNegotiation) frame wi…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop\n\nrfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter\nNegotiation) frame wi…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e7c0aa45ae6c5a338661b23812bfcdef50bf3e96","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbc2962da99b6b89345267d3aa74b4b573340548","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fc4851ff8dfb505e9a19efcc286712132bbd178d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f561e44261344adadf9d6a6dff31e3af9776d5c6","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < aeee917a4878af95f0c63e18c5f22eaf6299c7b8","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3988cbb1be501dbff909a2ee024670e3c955a66d","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 44c98fd082eafd49d55a8a4077ff488175b2fe24","Linux 2.6.12"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:16:59.880","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90088","references":[{"url":"https://git.kernel.org/stable/c/3988cbb1be501dbff909a2ee024670e3c955a66d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/44c98fd082eafd49d55a8a4077ff488175b2fe24","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b2e5f1928c99224345a9ed8c5dae5fc74964d6d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/aeee917a4878af95f0c63e18c5f22eaf6299c7b8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cbc2962da99b6b89345267d3aa74b4b573340548","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e7c0aa45ae6c5a338661b23812bfcdef50bf3e96","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f561e44261344adadf9d6a6dff31e3af9776d5c6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc4851ff8dfb505e9a19efcc286712132bbd178d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.893Z","epss":0.00211,"epssPercentile":0.11599,"slug":"CVE-2026-90088","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop\n\nrfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter\nNegotiation) frame without checking for zero. When the remote peer\nsends an MTU of zero, d->mtu is set to 0. This causes the sendmsg\npath to enter an infinite loop when fragmenting data, as each fragment\nhas size == min_t(size_t, len, 0) == 0, so the remaining length never\ndecreases. The infinite allocation of zero-length skbs exhausts all\nsystem memory.\n\nFix by clamping d->mtu to RFCOMM_DEFAULT_MTU when the negotiated\nvalue is zero, consistent with the initial value assigned in\nrfcomm_dlc_alloc().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}