| From bippy-1.1.0 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-2023-52752: smb: client: fix use-after-free bug in cifs_debug_data_proc_show() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| smb: client: fix use-after-free bug in cifs_debug_data_proc_show() |
| |
| Skip SMB sessions that are being teared down |
| (e.g. @ses->ses_status == SES_EXITING) in cifs_debug_data_proc_show() |
| to avoid use-after-free in @ses. |
| |
| This fixes the following GPF when reading from /proc/fs/cifs/DebugData |
| while mounting and umounting |
| |
| [ 816.251274] general protection fault, probably for non-canonical |
| address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI |
| ... |
| [ 816.260138] Call Trace: |
| [ 816.260329] <TASK> |
| [ 816.260499] ? die_addr+0x36/0x90 |
| [ 816.260762] ? exc_general_protection+0x1b3/0x410 |
| [ 816.261126] ? asm_exc_general_protection+0x26/0x30 |
| [ 816.261502] ? cifs_debug_tcon+0xbd/0x240 [cifs] |
| [ 816.261878] ? cifs_debug_tcon+0xab/0x240 [cifs] |
| [ 816.262249] cifs_debug_data_proc_show+0x516/0xdb0 [cifs] |
| [ 816.262689] ? seq_read_iter+0x379/0x470 |
| [ 816.262995] seq_read_iter+0x118/0x470 |
| [ 816.263291] proc_reg_read_iter+0x53/0x90 |
| [ 816.263596] ? srso_alias_return_thunk+0x5/0x7f |
| [ 816.263945] vfs_read+0x201/0x350 |
| [ 816.264211] ksys_read+0x75/0x100 |
| [ 816.264472] do_syscall_64+0x3f/0x90 |
| [ 816.264750] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 |
| [ 816.265135] RIP: 0033:0x7fd5e669d381 |
| |
| The Linux kernel CVE team has assigned CVE-2023-52752 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.237 with commit 2abdf136784b7edaec7ffe0f4b461b63f9c4c4de |
| Fixed in 5.15.181 with commit 336a066990bb3962c46daf574ace596bda9303ce |
| Fixed in 6.1.64 with commit 558817597d5fbd7af31f891b67b0fd20f0d047b7 |
| Fixed in 6.5.13 with commit 89929ea46f9cc11ba66d2c64713aa5d5dc723b09 |
| Fixed in 6.6.3 with commit 0ab6f842452ce2cae04209d4671ac6289d0aef8a |
| Fixed in 6.7 with commit d328c09ee9f15ee5a26431f5aad7c9239fa85e62 |
| |
| 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-2023-52752 |
| 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: |
| fs/smb/client/cifs_debug.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/2abdf136784b7edaec7ffe0f4b461b63f9c4c4de |
| https://git.kernel.org/stable/c/336a066990bb3962c46daf574ace596bda9303ce |
| https://git.kernel.org/stable/c/558817597d5fbd7af31f891b67b0fd20f0d047b7 |
| https://git.kernel.org/stable/c/89929ea46f9cc11ba66d2c64713aa5d5dc723b09 |
| https://git.kernel.org/stable/c/0ab6f842452ce2cae04209d4671ac6289d0aef8a |
| https://git.kernel.org/stable/c/d328c09ee9f15ee5a26431f5aad7c9239fa85e62 |
