| 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-2024-53174: SUNRPC: make sure cache entry active before cache_show |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| SUNRPC: make sure cache entry active before cache_show |
| |
| The function `c_show` was called with protection from RCU. This only |
| ensures that `cp` will not be freed. Therefore, the reference count for |
| `cp` can drop to zero, which will trigger a refcount use-after-free |
| warning when `cache_get` is called. To resolve this issue, use |
| `cache_get_rcu` to ensure that `cp` remains active. |
| |
| ------------[ cut here ]------------ |
| refcount_t: addition on 0; use-after-free. |
| WARNING: CPU: 7 PID: 822 at lib/refcount.c:25 |
| refcount_warn_saturate+0xb1/0x120 |
| CPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1 |
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS |
| 1.16.1-2.fc37 04/01/2014 |
| RIP: 0010:refcount_warn_saturate+0xb1/0x120 |
| |
| Call Trace: |
| <TASK> |
| c_show+0x2fc/0x380 [sunrpc] |
| seq_read_iter+0x589/0x770 |
| seq_read+0x1e5/0x270 |
| proc_reg_read+0xe1/0x140 |
| vfs_read+0x125/0x530 |
| ksys_read+0xc1/0x160 |
| do_syscall_64+0x5f/0x170 |
| entry_SYSCALL_64_after_hwframe+0x76/0x7e |
| |
| The Linux kernel CVE team has assigned CVE-2024-53174 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.287 with commit e9be26735d055c42543a4d047a769cc6d0fb1504 |
| Fixed in 5.10.231 with commit 02999e135b013d85c6df738746e8e24699befee4 |
| Fixed in 5.15.174 with commit c7dac3af57e38b2054f990e573256d90bf887958 |
| Fixed in 6.1.120 with commit 068c0b50f3f700b94f78850834cd91ae3b34c2c1 |
| Fixed in 6.6.64 with commit acfaf37888e0f0732fb6a50ff093dce6d99994d0 |
| Fixed in 6.11.11 with commit ec305f303bf070b4f6896b7a76009f702956d402 |
| Fixed in 6.12.2 with commit d882e2b7fad3f5e5fac66184a347f408813f654a |
| Fixed in 6.13 with commit 2862eee078a4d2d1f584e7f24fa50dddfa5f3471 |
| |
| 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-2024-53174 |
| 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/sunrpc/cache.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/e9be26735d055c42543a4d047a769cc6d0fb1504 |
| https://git.kernel.org/stable/c/02999e135b013d85c6df738746e8e24699befee4 |
| https://git.kernel.org/stable/c/c7dac3af57e38b2054f990e573256d90bf887958 |
| https://git.kernel.org/stable/c/068c0b50f3f700b94f78850834cd91ae3b34c2c1 |
| https://git.kernel.org/stable/c/acfaf37888e0f0732fb6a50ff093dce6d99994d0 |
| https://git.kernel.org/stable/c/ec305f303bf070b4f6896b7a76009f702956d402 |
| https://git.kernel.org/stable/c/d882e2b7fad3f5e5fac66184a347f408813f654a |
| https://git.kernel.org/stable/c/2862eee078a4d2d1f584e7f24fa50dddfa5f3471 |
