| 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-2025-21745: blk-cgroup: Fix class @block_class's subsystem refcount leakage |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| blk-cgroup: Fix class @block_class's subsystem refcount leakage |
| |
| blkcg_fill_root_iostats() iterates over @block_class's devices by |
| class_dev_iter_(init|next)(), but does not end iterating with |
| class_dev_iter_exit(), so causes the class's subsystem refcount leakage. |
| |
| Fix by ending the iterating with class_dev_iter_exit(). |
| |
| The Linux kernel CVE team has assigned CVE-2025-21745 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 5.10.235 with commit ffb494f1e7a047bd7a41b13796fcfb08fe5beafb |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 5.15.179 with commit 38287f779b34dfe959b4b681e909f2d3d52b88be |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 6.1.129 with commit 431b6ef2714be4d5babb802114987541a88b43b0 |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 6.6.78 with commit 993121481b5a87829f1e8163f47158b72679f309 |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 6.12.14 with commit 2ce09aabe009453d641a2ceb79e6461a2d4f3876 |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 6.13.3 with commit 67c7f213e052b1aa6caba4a7e25e303bc6997126 |
| Issue introduced in 5.9 with commit ef45fe470e1e5410db4af87abc5d5055427945ac and fixed in 6.14 with commit d1248436cbef1f924c04255367ff4845ccd9025e |
| |
| 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-2025-21745 |
| 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: |
| block/blk-cgroup.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/ffb494f1e7a047bd7a41b13796fcfb08fe5beafb |
| https://git.kernel.org/stable/c/38287f779b34dfe959b4b681e909f2d3d52b88be |
| https://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0 |
| https://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309 |
| https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876 |
| https://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126 |
| https://git.kernel.org/stable/c/d1248436cbef1f924c04255367ff4845ccd9025e |
