CVSS: 5.5EPSS: 0%CPEs: 8EXPL: 0CVE-2024-41012 – filelock: Remove locks reliably when fcntl/close race is detected
https://notcve.org/view.php?id=CVE-2024-41012
In the Linux kernel, the following vulnerability has been resolved: filelock: Remove locks reliably when fcntl/close race is detected When fcntl_setlk() races with close(), it removes the created lock with do_lock_file_wait(). However, LSMs can allow the first do_lock_file_wait() that created the lock while denying the second do_lock_file_wait() that tries to remove the lock. Separately, posix_lock_file() could also fail to remove a lock due to GFP_KERNEL allocation failure (when splitting a range in the middle). After the bug has been triggered, use-after-free reads will occur in lock_get_status() when userspace reads /proc/locks. This can likely be used to read arbitrary kernel memory, but can't corrupt kernel memory. Fix it by calling locks_remove_posix() instead, which is designed to reliably get rid of POSIX locks associated with the given file and files_struct and is also used by filp_flush(). En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: filelock: Elimina bloqueos de manera confiable cuando se detecta fcntl/close race Cuando fcntl_setlk() corre con close(), elimina el bloqueo creado con do_lock_file_wait(). Sin embargo, los LSM pueden permitir el primer do_lock_file_wait() que creó el bloqueo y al mismo tiempo negar el segundo do_lock_file_wait() que intenta eliminar el bloqueo. Por separado, posix_lock_file() también podría no eliminar un bloqueo debido a un fallo en la asignación de GFP_KERNEL (al dividir un rango por la mitad). • https://git.kernel.org/stable/c/c293621bbf678a3d85e3ed721c3921c8a670610d https://git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250 https://git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235 https://git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240 https://git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22 https://git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3 https://git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763 https://git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823 •
CVSS: 5.5EPSS: 0%CPEs: 8EXPL: 0CVE-2022-48853 – swiotlb: fix info leak with DMA_FROM_DEVICE
https://notcve.org/view.php?id=CVE-2022-48853
In the Linux kernel, the following vulnerability has been resolved: swiotlb: fix info leak with DMA_FROM_DEVICE The problem I'm addressing was discovered by the LTP test covering cve-2018-1000204. A short description of what happens follows: 1) The test case issues a command code 00 (TEST UNIT READY) via the SG_IO interface with: dxfer_len == 524288, dxdfer_dir == SG_DXFER_FROM_DEV and a corresponding dxferp. The peculiar thing about this is that TUR is not reading from the device. 2) In sg_start_req() the invocation of blk_rq_map_user() effectively bounces the user-space buffer. As if the device was to transfer into it. Since commit a45b599ad808 ("scsi: sg: allocate with __GFP_ZERO in sg_build_indirect()") we make sure this first bounce buffer is allocated with GFP_ZERO. 3) For the rest of the story we keep ignoring that we have a TUR, so the device won't touch the buffer we prepare as if the we had a DMA_FROM_DEVICE type of situation. My setup uses a virtio-scsi device and the buffer allocated by SG is mapped by the function virtqueue_add_split() which uses DMA_FROM_DEVICE for the "in" sgs (here scatter-gather and not scsi generics). • https://git.kernel.org/stable/c/c132f2ba716b5ee6b35f82226a6e5417d013d753 https://git.kernel.org/stable/c/971e5dadffd02beba1063e7dd9c3a82de17cf534 https://git.kernel.org/stable/c/8d9ac1b6665c73f23e963775f85d99679fd8e192 https://git.kernel.org/stable/c/6bfc5377a210dbda2a237f16d94d1bd4f1335026 https://git.kernel.org/stable/c/d4d975e7921079f877f828099bb8260af335508f https://git.kernel.org/stable/c/7403f4118ab94be837ab9d770507537a8057bc63 https://git.kernel.org/stable/c/270475d6d2410ec66e971bf181afe1958dad565e https://git.kernel.org/stable/c/ddbd89deb7d32b1fbb879f48d68fda1a8 •
CVSS: 3.3EPSS: 0%CPEs: 3EXPL: 0CVE-2022-48852 – drm/vc4: hdmi: Unregister codec device on unbind
https://notcve.org/view.php?id=CVE-2022-48852
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: hdmi: Unregister codec device on unbind On bind we will register the HDMI codec device but we don't unregister it on unbind, leading to a device leakage. Unregister our device at unbind. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/vc4: hdmi: Anular el registro del dispositivo códec al desvincular. Al vincular, registraremos el dispositivo códec HDMI pero no lo cancelaremos al desvincular, lo que provoca una fuga del dispositivo. Dar de baja nuestro dispositivo en unbind. • https://git.kernel.org/stable/c/ee22082c3e2f230028afa0e22aa8773b1de3c919 https://git.kernel.org/stable/c/1ed68d776246f167aee9cd79f63f089c40a5e2a3 https://git.kernel.org/stable/c/e40945ab7c7f966d0c37b7bd7b0596497dfe228d •
CVSS: 5.5EPSS: 0%CPEs: 8EXPL: 0CVE-2022-48850 – net-sysfs: add check for netdevice being present to speed_show
https://notcve.org/view.php?id=CVE-2022-48850
In the Linux kernel, the following vulnerability has been resolved: net-sysfs: add check for netdevice being present to speed_show When bringing down the netdevice or system shutdown, a panic can be triggered while accessing the sysfs path because the device is already removed. [ 755.549084] mlx5_core 0000:12:00.1: Shutdown was called [ 756.404455] mlx5_core 0000:12:00.0: Shutdown was called ... [ 757.937260] BUG: unable to handle kernel NULL pointer dereference at (null) [ 758.031397] IP: [<ffffffff8ee11acb>] dma_pool_alloc+0x1ab/0x280 crash> bt ... PID: 12649 TASK: ffff8924108f2100 CPU: 1 COMMAND: "amsd" ... #9 [ffff89240e1a38b0] page_fault at ffffffff8f38c778 [exception RIP: dma_pool_alloc+0x1ab] RIP: ffffffff8ee11acb RSP: ffff89240e1a3968 RFLAGS: 00010046 RAX: 0000000000000246 RBX: ffff89243d874100 RCX: 0000000000001000 RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffff89243d874090 RBP: ffff89240e1a39c0 R8: 000000000001f080 R9: ffff8905ffc03c00 R10: ffffffffc04680d4 R11: ffffffff8edde9fd R12: 00000000000080d0 R13: ffff89243d874090 R14: ffff89243d874080 R15: 0000000000000000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #10 [ffff89240e1a39c8] mlx5_alloc_cmd_msg at ffffffffc04680f3 [mlx5_core] #11 [ffff89240e1a3a18] cmd_exec at ffffffffc046ad62 [mlx5_core] #12 [ffff89240e1a3ab8] mlx5_cmd_exec at ffffffffc046b4fb [mlx5_core] #13 [ffff89240e1a3ae8] mlx5_core_access_reg at ffffffffc0475434 [mlx5_core] #14 [ffff89240e1a3b40] mlx5e_get_fec_caps at ffffffffc04a7348 [mlx5_core] #15 [ffff89240e1a3bb0] get_fec_supported_advertised at ffffffffc04992bf [mlx5_core] #16 [ffff89240e1a3c08] mlx5e_get_link_ksettings at ffffffffc049ab36 [mlx5_core] #17 [ffff89240e1a3ce8] __ethtool_get_link_ksettings at ffffffff8f25db46 #18 [ffff89240e1a3d48] speed_show at ffffffff8f277208 #19 [ffff89240e1a3dd8] dev_attr_show at ffffffff8f0b70e3 #20 [ffff89240e1a3df8] sysfs_kf_seq_show at ffffffff8eedbedf #21 [ffff89240e1a3e18] kernfs_seq_show at ffffffff8eeda596 #22 [ffff89240e1a3e28] seq_read at ffffffff8ee76d10 #23 [ffff89240e1a3e98] kernfs_fop_read at ffffffff8eedaef5 #24 [ffff89240e1a3ed8] vfs_read at ffffffff8ee4e3ff #25 [ffff89240e1a3f08] sys_read at ffffffff8ee4f27f #26 [ffff89240e1a3f50] system_call_fastpath at ffffffff8f395f92 crash> net_device.state ffff89443b0c0000 state = 0x5 (__LINK_STATE_START| __LINK_STATE_NOCARRIER) To prevent this scenario, we also make sure that the netdevice is present. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net-sysfs: agregue verificación para que netdevice esté presente en speed_show Al desactivar el netdevice o apagar el sistema, se puede desencadenar un pánico al acceder a la ruta sysfs porque el dispositivo ya está eliminado. [ 755.549084] mlx5_core 0000:12:00.1: Se llamó al apagado [ 756.404455] mlx5_core 0000:12:00.0: Se llamó al apagado... [ 757.937260] ERROR: no se puede manejar la desreferencia del puntero NULL del kernel en (nulo) [ 758.031397] IP: [] dma_pool_alloc+0x1ab/0x280 crash> bt... PID: 12649 TAREA: ffff8924108f2100 CPU: 1 COMANDO: "amsd"... #9 [ffff89240e1a38b0] page_fault en ffffffff8f38c778 [excepción RIP: pool_alloc+0x1ab] RIP : ffffffff8ee11acb RSP: ffff89240e1a3968 RFLAGS: 00010046 RAX: 0000000000000246 RBX: ffff89243d874100 RCX: 0000000000001000 RDX: 00000000000000000 RSI: 0000000000000246 RDI: ffff89243d874090 RBP: ffff89240e1a39c0 R8: 000000000001f080 R9: ffff8905ffc03c00 R10: ffffffffc04680d4 R11: d R12: 00000000000080d0 R13: ffff89243d874090 R14: ffff89243d874080 R15: 0000000000000000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #10 [ffff89240e1a39c8] mlx5_alloc_cmd_msg en ffffffffc04680f3 [mlx5_core] #11 [ffff89240e1a3a18] d_exec en ffffffffc046ad62 [mlx5_core] #12 [ffff89240e1a3ab8] mlx5_cmd_exec en ffffffffc046b4fb [mlx5_core] #13 [ffff89240e1a3ae8] mlx5_core_access_reg en ffffffffc0475434 [mlx5_core] #14 [ffff89240e1a3b40] mlx5e_get_fec_caps en ffffffffc04a7348 [mlx5_core] #15 [ffff89240e1a3bb0] get_fec_supported_advertised en ffffffffc04992bf [mlx5_core] #16 [ffff89240e1a3c08] mlx5e_get_link_ksettings en ffffffffc049ab36 [mlx5_core] #17 [ffff89240e1a3ce8] __ethtool_get_link_ksettings en ffffffff8f25db46 #18 [ ffff89240e1a3d48] speed_show en ffffffff8f277208 #19 [ffff89240e1a3dd8] dev_attr_show en ffffffff8f0b70e3 #20 [ffff89240e1a3df8] sysfs_kf_seq_show en ffffffff8eedbedf #21 40e1a3e18] kernfs_seq_show en ffffffff8eeda596 #22 [ffff89240e1a3e28] seq_read en ffffffff8ee76d10 #23 [ffff89240e1a3e98] kernfs_fop_read en ffffffff8eedaef5 #24 8] vfs_read en ffffffff8ee4e3ff #25 [ffff89240e1a3f08] sys_read en ffffffff8ee4f27f #26 [ffff89240e1a3f50] system_call_fastpath en ffffffff8f395f92 crash> net_device.state ffff89443b0c0000 estado = 0x5 LINK_STATE_START| __LINK_STATE_NOCARRIER) Para evitar este escenario, también nos aseguramos de que el netdevice esté presente. • https://git.kernel.org/stable/c/a7b9ab04c5932dee7ec95e0abc58b0df350c0dd2 https://git.kernel.org/stable/c/081369ad088a76429984483b8a5f7e967a125aad https://git.kernel.org/stable/c/75fc8363227a999e8f3d17e2eb28dce5600dcd3f https://git.kernel.org/stable/c/8879b5313e9fa5e0c6d6812a0d25d83aed0110e2 https://git.kernel.org/stable/c/d15c9f6e3335002fea1c33bc8f71a705fa96976c https://git.kernel.org/stable/c/8d5e69d8fbf3a35ab4fbe56b8f092802b43f3ef6 https://git.kernel.org/stable/c/3a79f380b3e10edf6caa9aac90163a5d7a282204 https://git.kernel.org/stable/c/4224cfd7fb6523f7a9d1c8bb91bb5df1e • CWE-476: NULL Pointer Dereference •
CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0CVE-2022-48849 – drm/amdgpu: bypass tiling flag check in virtual display case (v2)
https://notcve.org/view.php?id=CVE-2022-48849
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: bypass tiling flag check in virtual display case (v2) vkms leverages common amdgpu framebuffer creation, and also as it does not support FB modifier, there is no need to check tiling flags when initing framebuffer when virtual display is enabled. This can fix below calltrace: amdgpu 0000:00:08.0: GFX9+ requires FB check based on format modifier WARNING: CPU: 0 PID: 1023 at drivers/gpu/drm/amd/amdgpu/amdgpu_display.c:1150 amdgpu_display_framebuffer_init+0x8e7/0xb40 [amdgpu] v2: check adev->enable_virtual_display instead as vkms can be enabled in bare metal as well. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amdgpu: omite la verificación del indicador de mosaico en la vitrina virtual (v2) vkms aprovecha la creación de framebuffer amdgpu común y, además, como no admite el modificador FB, no es necesario verificar los indicadores de mosaico al iniciar framebuffer cuando la visualización virtual está habilitada. Esto se puede solucionar a continuación: amdgpu 0000:00:08.0: GFX9+ requiere verificación de FB según el modificador de formato ADVERTENCIA: CPU: 0 PID: 1023 en drivers/gpu/drm/amd/amdgpu/amdgpu_display.c:1150 amdgpu_display_framebuffer_init+0x8e7/0xb40 [amdgpu] v2: marque adev->enable_virtual_display en su lugar, ya que vkms también se puede habilitar en bare metal. • https://git.kernel.org/stable/c/fcd1d79aa943fff4fbaa0cce1d576995a7960699 https://git.kernel.org/stable/c/cb29021be49858059138f75d6311a7c35a9379b2 https://git.kernel.org/stable/c/e2b993302f40c4eb714ecf896dd9e1c5be7d4cd7 •