Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in rfcomm_recv_frame rfcomm_recv_frame() casts skb->data to struct rfcomm_hdr and dereferences hdr->addr and hdr->ctrl without validating skb->len first. A truncated frame with skb->len less than the minimum header size causes an out-of-bounds read of uninitialized memory. Additionally, a zero-length frame causes skb->len-- to underflow to UINT_MAX, making skb_tail_pointer() read far past the buffer. Commit 23882b828c3c ("Bluetooth: RFCOMM: validate skb length in MCC handlers") fixed the same class of missing-length-check bugs in the MCC sub-handlers, but the top-level rfcomm_recv_frame() was left unfixed. KMSAN reports: BUG: KMSAN: uninit-value in rfcomm_run ... Uninit was created at: __alloc_skb+0x474/0xb60 vhci_write+0xe9/0x870 Fix this by rejecting frames smaller than sizeof(struct rfcomm_hdr) + 1 (the minimum frame must have a 3-byte header and a 1-byte FCS).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fb40eda15122f6b780228639c1ead6820340ff54affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 3829af5fab5a22405bf1e7d69068c2ec0fce46caaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b161eacd7fa4a2d765724b5504ac6cc388e48f80affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 30d1d9f3495463f7c026e4c553127f79b486fcd6affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 67dc3b40fae71b6b11c71e7ff69bac0758818c05affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b230e5bf501c5edaf2eb0991cb862ac142031d4baffected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/fb40eda15122f6b780228639c1ead6820340ff54 ↗
- https://git.kernel.org/stable/c/3829af5fab5a22405bf1e7d69068c2ec0fce46ca ↗
- https://git.kernel.org/stable/c/b161eacd7fa4a2d765724b5504ac6cc388e48f80 ↗
- https://git.kernel.org/stable/c/30d1d9f3495463f7c026e4c553127f79b486fcd6 ↗
- https://git.kernel.org/stable/c/67dc3b40fae71b6b11c71e7ff69bac0758818c05 ↗
- https://git.kernel.org/stable/c/bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51 ↗
- https://git.kernel.org/stable/c/b230e5bf501c5edaf2eb0991cb862ac142031d4b ↗