Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 44ee19422aa82a6847594866de7e5a31e4ef98b3; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7b8a574da5d7ea99b943f7a3458a17a1d95e8838; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d50e2019c9d7c433f56d9dff65703eb904aa1fb1; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a672682d39dd34e2b5ba4feb436723bed65125ff; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before aefc1a97da17d8309974690c8a03e439a91ebb1c; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ee5737891464030a189837467df3b81a273718ad; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d0fb4d1dc43f8d5179917a2daaa82680993d4cdf; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0eb09f737428e482a32a2e31e5e223f2b35a71d3 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
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