| 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-2025-37806: fs/ntfs3: Keep write operations atomic |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| fs/ntfs3: Keep write operations atomic |
| |
| syzbot reported a NULL pointer dereference in __generic_file_write_iter. [1] |
| |
| Before the write operation is completed, the user executes ioctl[2] to clear |
| the compress flag of the file, which causes the is_compressed() judgment to |
| return 0, further causing the program to enter the wrong process and call the |
| wrong ops ntfs_aops_cmpr, which triggers the null pointer dereference of |
| write_begin. |
| |
| Use inode lock to synchronize ioctl and write to avoid this case. |
| |
| [1] |
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 |
| Mem abort info: |
| ESR = 0x0000000086000006 |
| EC = 0x21: IABT (current EL), IL = 32 bits |
| SET = 0, FnV = 0 |
| EA = 0, S1PTW = 0 |
| FSC = 0x06: level 2 translation fault |
| user pgtable: 4k pages, 48-bit VAs, pgdp=000000011896d000 |
| [0000000000000000] pgd=0800000118b44403, p4d=0800000118b44403, pud=0800000117517403, pmd=0000000000000000 |
| Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP |
| Modules linked in: |
| CPU: 0 UID: 0 PID: 6427 Comm: syz-executor347 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 |
| pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| pc : 0x0 |
| lr : generic_perform_write+0x29c/0x868 mm/filemap.c:4055 |
| sp : ffff80009d4978a0 |
| x29: ffff80009d4979c0 x28: dfff800000000000 x27: ffff80009d497bc8 |
| x26: 0000000000000000 x25: ffff80009d497960 x24: ffff80008ba71c68 |
| x23: 0000000000000000 x22: ffff0000c655dac0 x21: 0000000000001000 |
| x20: 000000000000000c x19: 1ffff00013a92f2c x18: ffff0000e183aa1c |
| x17: 0004060000000014 x16: ffff800083275834 x15: 0000000000000001 |
| x14: 0000000000000000 x13: 0000000000000001 x12: ffff0000c655dac0 |
| x11: 0000000000ff0100 x10: 0000000000ff0100 x9 : 0000000000000000 |
| x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 |
| x5 : ffff80009d497980 x4 : ffff80009d497960 x3 : 0000000000001000 |
| x2 : 0000000000000000 x1 : ffff0000e183a928 x0 : ffff0000d60b0fc0 |
| Call trace: |
| 0x0 (P) |
| __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4156 |
| ntfs_file_write_iter+0x54c/0x630 fs/ntfs3/file.c:1267 |
| new_sync_write fs/read_write.c:586 [inline] |
| vfs_write+0x920/0xcf4 fs/read_write.c:679 |
| ksys_write+0x15c/0x26c fs/read_write.c:731 |
| __do_sys_write fs/read_write.c:742 [inline] |
| __se_sys_write fs/read_write.c:739 [inline] |
| __arm64_sys_write+0x7c/0x90 fs/read_write.c:739 |
| __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] |
| invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 |
| el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 |
| do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 |
| el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 |
| el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 |
| |
| [2] |
| ioctl$FS_IOC_SETFLAGS(r0, 0x40086602, &(0x7f00000000c0)=0x20) |
| |
| The Linux kernel CVE team has assigned CVE-2025-37806 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 4534a70b7056fd4b9a1c6db5a4ce3c98546b291e and fixed in 6.12.26 with commit 8db49e89a7f8b48ee59fa9ad32b6ed0879747df8 |
| Issue introduced in 5.15 with commit 4534a70b7056fd4b9a1c6db5a4ce3c98546b291e and fixed in 6.14.5 with commit 464139e18f619aa14fb921a61721862f43421c54 |
| Issue introduced in 5.15 with commit 4534a70b7056fd4b9a1c6db5a4ce3c98546b291e and fixed in 6.15 with commit 285cec318bf5a7a6c8ba999b2b6ec96f9a20590f |
| |
| 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-2025-37806 |
| 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/ntfs3/file.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/8db49e89a7f8b48ee59fa9ad32b6ed0879747df8 |
| https://git.kernel.org/stable/c/464139e18f619aa14fb921a61721862f43421c54 |
| https://git.kernel.org/stable/c/285cec318bf5a7a6c8ba999b2b6ec96f9a20590f |
