CVE-2024-36016
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.27% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0fb736c9931e02dbc7d9a75044c8e1c039e50f04Patch
- https://git.kernel.org/stable/c/46f52c89a7e7d2691b97a9728e4591d071ca8abcPatch
- https://git.kernel.org/stable/c/47388e807f85948eefc403a8a5fdc5b406a65d5aPatch
- https://git.kernel.org/stable/c/4c267110fc110390704cc065edb9817fdd10ff54Patch
- https://git.kernel.org/stable/c/774d83b008eccb1c48c14dc5486e7aa255731350Patch
- https://git.kernel.org/stable/c/9513d4148950b05bc99fa7314dc883cc0e1605e5Patch
- https://git.kernel.org/stable/c/b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56Patch
- https://git.kernel.org/stable/c/b890d45aaf02b564e6cae2d2a590f9649330857dPatch
- https://git.kernel.org/stable/c/f126ce7305fe88f49cdabc6db4168b9318898ea3Patch
- https://git.kernel.org/stable/c/0fb736c9931e02dbc7d9a75044c8e1c039e50f04Patch
- https://git.kernel.org/stable/c/46f52c89a7e7d2691b97a9728e4591d071ca8abcPatch
- https://git.kernel.org/stable/c/47388e807f85948eefc403a8a5fdc5b406a65d5aPatch
- https://git.kernel.org/stable/c/4c267110fc110390704cc065edb9817fdd10ff54Patch
- https://git.kernel.org/stable/c/774d83b008eccb1c48c14dc5486e7aa255731350Patch
- https://git.kernel.org/stable/c/9513d4148950b05bc99fa7314dc883cc0e1605e5Patch
- https://git.kernel.org/stable/c/b229bc6c6ea9fe459fc3fa94fd0a27a2f32aca56Patch
- https://git.kernel.org/stable/c/b890d45aaf02b564e6cae2d2a590f9649330857dPatch
- https://git.kernel.org/stable/c/f126ce7305fe88f49cdabc6db4168b9318898ea3Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.