Description
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: reject firmware images without a ':' record header do_flash() locates the first .cyacd record with p = strnchr(fw->data, fw->size, ':'); while (p < eof) { s = strnchr(p + 1, eof - p - 1, ':'); ... } If the firmware image contains no ':' byte, strnchr() returns NULL. NULL compares less than the valid kernel pointer eof, so the loop body runs and strnchr() is called with p + 1 == (void *)1 and a length of roughly (unsigned long)eof, causing a wonderful crash. The not_signed_fw fallthrough earlier in do_flash() and the chip-state branches in ccg_fw_update_needed() allow an unsigned blob to reach this loop, so a root user who can place a crafted file under /lib/firmware and write the do_flash sysfs attribute can trigger the oops. Bail out with -EINVAL when the initial strnchr() returns NULL.
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
5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < b41dfc033fe594e152648050e95b9489cd53e9e3affected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < 2f395ca1263bd181995eb829f5943a83a20db213affected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < 6526f8684f72391138353642af908803ba70795eaffected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < 3f432b8203066c26770fe6ea591361f10021dd6baffected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbbaffected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < a38ed87818b2419090fb1a6338ddce6842b65dfaaffected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < c8460de584fe5415d212cfdd127d4db90835a450affected5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 to < d7486952bf74e546ee3748fb14b2d07881fa6273affected
Linux Linux
Default version status: affected
5.2affected0 to < 5.2unaffected5.10.259 to ≤ 5.10.*unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.143 to ≤ 6.6.*unaffected6.12.93 to ≤ 6.12.*unaffected6.18.35 to ≤ 6.18.*unaffected7.0.12 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3 ↗
- https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213 ↗
- https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e ↗
- https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b ↗
- https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb ↗
- https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa ↗
- https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450 ↗
- https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273 ↗