Description
In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() Assuming the following: - side A configures the n_gsm in basic option mode - side B sends the header of a basic option mode frame with data length 1 - side A switches to advanced option mode - side B sends 2 data bytes which exceeds gsm->len Reason: gsm->len is not used in advanced option mode. - side A switches to basic option mode - side B keeps sending until gsm0_receive() writes past gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after reconfiguration. Fix this by changing gsm->count to gsm->len comparison from equal to less than. Also add upper limit checks against the constant MAX_MRU in gsm0_receive() and gsm1_receive() to harden against memory corruption of gsm->len and gsm->mru. All other checks remain as we still need to limit the data according to the user configuration and actual payload size.
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
e1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 9513d4148950b05bc99fa7314dc883cc0e1605e5affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 0fb736c9931e02dbc7d9a75044c8e1c039e50f04affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 4c267110fc110390704cc065edb9817fdd10ff54affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 46f52c89a7e7d2691b97a9728e4591d071ca8abcaffectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 774d83b008eccb1c48c14dc5486e7aa255731350affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < f126ce7305fe88f49cdabc6db4168b9318898ea3affectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < b890d45aaf02b564e6cae2d2a590f9649330857daffectede1eaea46bb4020b38a141b84f88565d4603f8dd0 to < 47388e807f85948eefc403a8a5fdc5b406a65d5aaffected
Linux Linux
Default version status: affected
2.6.35affected0 to < 2.6.35unaffected4.19.316 to ≤ 4.19.*unaffected5.4.278 to ≤ 5.4.*unaffected5.10.219 to ≤ 5.10.*unaffected5.15.161 to ≤ 5.15.*unaffected6.1.93 to ≤ 6.1.*unaffected6.6.33 to ≤ 6.6.*unaffected6.8.12 to ≤ 6.8.*unaffected6.9.3 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9513d4148950b05bc99fa7314dc883cc0e1605e5 ↗
- https://git.kernel.org/stable/c/b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56 ↗
- https://git.kernel.org/stable/c/0fb736c9931e02dbc7d9a75044c8e1c039e50f04 ↗
- https://git.kernel.org/stable/c/4c267110fc110390704cc065edb9817fdd10ff54 ↗
- https://git.kernel.org/stable/c/46f52c89a7e7d2691b97a9728e4591d071ca8abc ↗
- https://git.kernel.org/stable/c/774d83b008eccb1c48c14dc5486e7aa255731350 ↗
- https://git.kernel.org/stable/c/f126ce7305fe88f49cdabc6db4168b9318898ea3 ↗
- https://git.kernel.org/stable/c/b890d45aaf02b564e6cae2d2a590f9649330857d ↗
- https://git.kernel.org/stable/c/47388e807f85948eefc403a8a5fdc5b406a65d5a ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html ↗