| 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-2024-38621: media: stk1160: fix bounds checking in stk1160_copy_video() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| media: stk1160: fix bounds checking in stk1160_copy_video() |
| |
| The subtract in this condition is reversed. The ->length is the length |
| of the buffer. The ->bytesused is how many bytes we have copied thus |
| far. When the condition is reversed that means the result of the |
| subtraction is always negative but since it's unsigned then the result |
| is a very high positive value. That means the overflow check is never |
| true. |
| |
| Additionally, the ->bytesused doesn't actually work for this purpose |
| because we're not writing to "buf->mem + buf->bytesused". Instead, the |
| math to calculate the destination where we are writing is a bit |
| involved. You calculate the number of full lines already written, |
| multiply by two, skip a line if necessary so that we start on an odd |
| numbered line, and add the offset into the line. |
| |
| To fix this buffer overflow, just take the actual destination where we |
| are writing, if the offset is already out of bounds print an error and |
| return. Otherwise, write up to buf->length bytes. |
| |
| The Linux kernel CVE team has assigned CVE-2024-38621 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 4.19.316 with commit f6a392266276730bea893b55d12940e32a25f56a |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 5.4.278 with commit ecf4ddc3aee8ade504c4d36b7b4053ce6093e200 |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 5.10.219 with commit a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7 |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 5.15.161 with commit 7532bcec0797adfa08791301c3bcae14141db3bd |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 6.1.93 with commit b504518a397059e1d55c521ba0ea2b545a6c4b52 |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 6.6.33 with commit d410017a7181cb55e4a5c810b32b75e4416c6808 |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 6.9.4 with commit a08492832cc4cacc24e0612f483c86ca899b9261 |
| Issue introduced in 3.7 with commit 9cb2173e6ea8f2948bd1367c93083a2500fcf08f and fixed in 6.10 with commit faa4364bef2ec0060de381ff028d1d836600a381 |
| |
| 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-2024-38621 |
| 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/media/usb/stk1160/stk1160-video.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/f6a392266276730bea893b55d12940e32a25f56a |
| https://git.kernel.org/stable/c/ecf4ddc3aee8ade504c4d36b7b4053ce6093e200 |
| https://git.kernel.org/stable/c/a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7 |
| https://git.kernel.org/stable/c/7532bcec0797adfa08791301c3bcae14141db3bd |
| https://git.kernel.org/stable/c/b504518a397059e1d55c521ba0ea2b545a6c4b52 |
| https://git.kernel.org/stable/c/d410017a7181cb55e4a5c810b32b75e4416c6808 |
| https://git.kernel.org/stable/c/a08492832cc4cacc24e0612f483c86ca899b9261 |
| https://git.kernel.org/stable/c/faa4364bef2ec0060de381ff028d1d836600a381 |
