| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-36016: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36016 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 4.19.316 with commit 9513d4148950b05bc99fa7314dc883cc0e1605e5 |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 5.4.278 with commit b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56 |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 5.10.219 with commit 0fb736c9931e02dbc7d9a75044c8e1c039e50f04 |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 5.15.161 with commit 4c267110fc110390704cc065edb9817fdd10ff54 |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 6.1.93 with commit 46f52c89a7e7d2691b97a9728e4591d071ca8abc |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 6.6.33 with commit 774d83b008eccb1c48c14dc5486e7aa255731350 |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 6.8.12 with commit f126ce7305fe88f49cdabc6db4168b9318898ea3 |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 6.9.3 with commit b890d45aaf02b564e6cae2d2a590f9649330857d |
| Issue introduced in 2.6.35 with commit e1eaea46bb4020b38a141b84f88565d4603f8dd0 and fixed in 6.10 with commit 47388e807f85948eefc403a8a5fdc5b406a65d5a |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-36016 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/tty/n_gsm.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| 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 |
