| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-22057: net: decrease cached dst counters in dst_release |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: decrease cached dst counters in dst_release |
| |
| Upstream fix ac888d58869b ("net: do not delay dst_entries_add() in |
| dst_release()") moved decrementing the dst count from dst_destroy to |
| dst_release to avoid accessing already freed data in case of netns |
| dismantle. However in case CONFIG_DST_CACHE is enabled and OvS+tunnels |
| are used, this fix is incomplete as the same issue will be seen for |
| cached dsts: |
| |
| Unable to handle kernel paging request at virtual address ffff5aabf6b5c000 |
| Call trace: |
| percpu_counter_add_batch+0x3c/0x160 (P) |
| dst_release+0xec/0x108 |
| dst_cache_destroy+0x68/0xd8 |
| dst_destroy+0x13c/0x168 |
| dst_destroy_rcu+0x1c/0xb0 |
| rcu_do_batch+0x18c/0x7d0 |
| rcu_core+0x174/0x378 |
| rcu_core_si+0x18/0x30 |
| |
| Fix this by invalidating the cache, and thus decrementing cached dst |
| counters, in dst_release too. |
| |
| The Linux kernel CVE team has assigned CVE-2025-22057 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.6.87 with commit ccc331fd5bcae131d2627d5ef099d4a1f6540aea |
| Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.12.23 with commit 92a5c18513117be69bc00419dd1724c1940f8fcd |
| Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.13.11 with commit 836415a8405c9665ae55352fc5ba865c242f5e4f |
| Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.14.2 with commit e833e7ad64eb2f63867f65303be49ca30ee8819e |
| Issue introduced in 4.6 with commit d71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 and fixed in 6.15 with commit 3a0a3ff6593d670af2451ec363ccb7b18aec0c0a |
| |
| 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-2025-22057 |
| 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: |
| net/core/dst.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/ccc331fd5bcae131d2627d5ef099d4a1f6540aea |
| https://git.kernel.org/stable/c/92a5c18513117be69bc00419dd1724c1940f8fcd |
| https://git.kernel.org/stable/c/836415a8405c9665ae55352fc5ba865c242f5e4f |
| https://git.kernel.org/stable/c/e833e7ad64eb2f63867f65303be49ca30ee8819e |
| https://git.kernel.org/stable/c/3a0a3ff6593d670af2451ec363ccb7b18aec0c0a |
