Description
In the Linux kernel, the following vulnerability has been resolved: ibmasm: fix OOB reads in command_file_write due to missing size checks The command_file_write() handler allocates a kernel buffer of exactly count bytes and copies user data into it, but does not validate the buffer against the dot command protocol before passing it to get_dot_command_size() and get_dot_command_timeout(). Since both the allocation size (count) and the header fields (command_size, data_size) are independently user-controlled, an attacker can cause get_dot_command_size() to return a value exceeding the allocation, triggering OOB reads in get_dot_command_timeout() and an out-of-bounds memcpy_toio() that leaks kernel heap memory to the service processor. Fix with two guards: reject writes smaller than sizeof(struct dot_command_header) before allocation, then after copying user data reject commands where the buffer is smaller than the total size declared by the header (sizeof(header) + command_size + data_size). This ensures all subsequent header and payload field accesses stay within the buffer.
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 < 44ee19422aa82a6847594866de7e5a31e4ef98b3affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7b8a574da5d7ea99b943f7a3458a17a1d95e8838affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d50e2019c9d7c433f56d9dff65703eb904aa1fb1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < a672682d39dd34e2b5ba4feb436723bed65125ffaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < aefc1a97da17d8309974690c8a03e439a91ebb1caffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ee5737891464030a189837467df3b81a273718adaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d0fb4d1dc43f8d5179917a2daaa82680993d4cdfaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 0eb09f737428e482a32a2e31e5e223f2b35a71d3affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.86 to ≤ 6.12.*unaffected6.18.27 to ≤ 6.18.*unaffected7.0.4 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/44ee19422aa82a6847594866de7e5a31e4ef98b3 ↗
- https://git.kernel.org/stable/c/7b8a574da5d7ea99b943f7a3458a17a1d95e8838 ↗
- https://git.kernel.org/stable/c/d50e2019c9d7c433f56d9dff65703eb904aa1fb1 ↗
- https://git.kernel.org/stable/c/a672682d39dd34e2b5ba4feb436723bed65125ff ↗
- https://git.kernel.org/stable/c/aefc1a97da17d8309974690c8a03e439a91ebb1c ↗
- https://git.kernel.org/stable/c/ee5737891464030a189837467df3b81a273718ad ↗
- https://git.kernel.org/stable/c/d0fb4d1dc43f8d5179917a2daaa82680993d4cdf ↗
- https://git.kernel.org/stable/c/0eb09f737428e482a32a2e31e5e223f2b35a71d3 ↗