CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2022-48822 – usb: f_fs: Fix use-after-free for epfile
https://notcve.org/view.php?id=CVE-2022-48822
In the Linux kernel, the following vulnerability has been resolved: usb: f_fs: Fix use-after-free for epfile Consider a case where ffs_func_eps_disable is called from ffs_func_disable as part of composition switch and at the same time ffs_epfile_release get called from userspace. ffs_epfile_release will free up the read buffer and call ffs_data_closed which in turn destroys ffs->epfiles and mark it as NULL. While this was happening the driver has already initialized the local epfile in ffs_func_eps_disable which is now freed and waiting to acquire the spinlock. Once spinlock is acquired the driver proceeds with the stale value of epfile and tries to free the already freed read buffer causing use-after-free. Following is the illustration of the race: CPU1 CPU2 ffs_func_eps_disable epfiles (local copy) ffs_epfile_release ffs_data_closed if (last file closed) ffs_data_reset ffs_data_clear ffs_epfiles_destroy spin_lock dereference epfiles Fix this races by taking epfiles local copy & assigning it under spinlock and if epfiles(local) is null then update it in ffs->epfiles then finally destroy it. Extending the scope further from the race, protecting the ep related structures, and concurrent accesses. • https://git.kernel.org/stable/c/a9e6f83c2df199187a5248f824f31b6787ae23ae https://git.kernel.org/stable/c/5cd8f6788ff34999dbd4cbec81a6adfc215e1e60 https://git.kernel.org/stable/c/32048f4be071f9a6966744243f1786f45bb22dc2 https://git.kernel.org/stable/c/cfe5f6fd335d882bcc829a1c8a7d462a455c626e https://git.kernel.org/stable/c/c9fc422c9a43e3d58d246334a71f3390401781dc https://git.kernel.org/stable/c/0042178a69eb77a979e36a50dcce9794a3140ef8 https://git.kernel.org/stable/c/72a8aee863af099d4434314c4536d6c9a61dcf3c https://git.kernel.org/stable/c/3e078b18753669615301d946297bafd69 •
CVSS: -EPSS: 0%CPEs: 5EXPL: 0CVE-2022-48821 – misc: fastrpc: avoid double fput() on failed usercopy
https://notcve.org/view.php?id=CVE-2022-48821
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: avoid double fput() on failed usercopy If the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free. Simply avoid calling dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid. • https://git.kernel.org/stable/c/6cffd79504ce040f460831030d3069fa1c99bb71 https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2022-48818 – net: dsa: mv88e6xxx: don't use devres for mdiobus
https://notcve.org/view.php?id=CVE-2022-48818
In the Linux kernel, the following vulnerability has been resolved: net: dsa: mv88e6xxx: don't use devres for mdiobus As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The mv88e6xxx is an MDIO device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the Marvell switch driver on shutdown. systemd-shutdown[1]: Powering off. mv88e6085 0x0000000008b96000:00 sw_gl0: Link is Down fsl-mc dpbp.9: Removing from iommu group 7 fsl-mc dpbp.8: Removing from iommu group 7 ------------[ cut here ]------------ kernel BUG at drivers/net/phy/mdio_bus.c:677! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 5.16.5-00040-gdc05f73788e5 #15 pc : mdiobus_free+0x44/0x50 lr : devm_mdiobus_free+0x10/0x20 Call trace: mdiobus_free+0x44/0x50 devm_mdiobus_free+0x10/0x20 devres_release_all+0xa0/0x100 __device_release_driver+0x190/0x220 device_release_driver_internal+0xac/0xb0 device_links_unbind_consumers+0xd4/0x100 __device_release_driver+0x4c/0x220 device_release_driver_internal+0xac/0xb0 device_links_unbind_consumers+0xd4/0x100 __device_release_driver+0x94/0x220 device_release_driver+0x28/0x40 bus_remove_device+0x118/0x124 device_del+0x174/0x420 fsl_mc_device_remove+0x24/0x40 __fsl_mc_device_remove+0xc/0x20 device_for_each_child+0x58/0xa0 dprc_remove+0x90/0xb0 fsl_mc_driver_remove+0x20/0x5c __device_release_driver+0x21c/0x220 device_release_driver+0x28/0x40 bus_remove_device+0x118/0x124 device_del+0x174/0x420 fsl_mc_bus_remove+0x80/0x100 fsl_mc_bus_shutdown+0xc/0x1c platform_shutdown+0x20/0x30 device_shutdown+0x154/0x330 kernel_power_off+0x34/0x6c __do_sys_reboot+0x15c/0x250 __arm64_sys_reboot+0x20/0x30 invoke_syscall.constprop.0+0x4c/0xe0 do_el0_svc+0x4c/0x150 el0_svc+0x24/0xb0 el0t_64_sync_handler+0xa8/0xb0 el0t_64_sync+0x178/0x17c So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The Marvell driver already has a good structure for mdiobus removal, so just plug in mdiobus_free and get rid of devres. • https://git.kernel.org/stable/c/ac3a68d56651c3dad2c12c7afce065fe15267f44 https://git.kernel.org/stable/c/8ccebe77df6e0d88c72ba5e69cf1835927e53b6c https://git.kernel.org/stable/c/8b626d45127d6f5ada7d815b83cfdc09e8cb1394 https://git.kernel.org/stable/c/1b451c3994a2d322f8e55032c62c8b47b7d95900 https://git.kernel.org/stable/c/f53a2ce893b2c7884ef94471f170839170a4eba0 •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2022-48817 – net: dsa: ar9331: register the mdiobus under devres
https://notcve.org/view.php?id=CVE-2022-48817
In the Linux kernel, the following vulnerability has been resolved: net: dsa: ar9331: register the mdiobus under devres As explained in commits: 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres") 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres") mdiobus_free() will panic when called from devm_mdiobus_free() <- devres_release_all() <- __device_release_driver(), and that mdiobus was not previously unregistered. The ar9331 is an MDIO device, so the initial set of constraints that I thought would cause this (I2C or SPI buses which call ->remove on ->shutdown) do not apply. But there is one more which applies here. If the DSA master itself is on a bus that calls ->remove from ->shutdown (like dpaa2-eth, which is on the fsl-mc bus), there is a device link between the switch and the DSA master, and device_links_unbind_consumers() will unbind the ar9331 switch driver on shutdown. So the same treatment must be applied to all DSA switch drivers, which is: either use devres for both the mdiobus allocation and registration, or don't use devres at all. The ar9331 driver doesn't have a complex code structure for mdiobus removal, so just replace of_mdiobus_register with the devres variant in order to be all-devres and ensure that we don't free a still-registered bus. • https://git.kernel.org/stable/c/ac3a68d56651c3dad2c12c7afce065fe15267f44 https://git.kernel.org/stable/c/475ce5dcf2d88fd4f3c213a0ac944e3e40702970 https://git.kernel.org/stable/c/aae1c6a1d3d696fc33b609fb12fe744a556d1dc5 https://git.kernel.org/stable/c/f1842a8cb71de4d7eb75a86f76e88c7ee739218c https://git.kernel.org/stable/c/50facd86e9fbc4b93fe02e5fe05776047f45dbfb •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2022-48816 – SUNRPC: lock against ->sock changing during sysfs read
https://notcve.org/view.php?id=CVE-2022-48816
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: lock against ->sock changing during sysfs read ->sock can be set to NULL asynchronously unless ->recv_mutex is held. So it is important to hold that mutex. Otherwise a sysfs read can trigger an oops. Commit 17f09d3f619a ("SUNRPC: Check if the xprt is connected before handling sysfs reads") appears to attempt to fix this problem, but it only narrows the race window. • https://git.kernel.org/stable/c/a8482488a7d6d320f63a9ee1912dbb5ae5b80a61 https://git.kernel.org/stable/c/21a2be1a5145d072deedc7cdc5b2d17380abea75 https://git.kernel.org/stable/c/77876473912d1bf1ed16bffa1674e5ff0f499f25 https://git.kernel.org/stable/c/9482ab4540f5bcc869b44c067ae99b5fca16bd07 https://git.kernel.org/stable/c/b49ea673e119f59c71645e2f65b3ccad857c90ee •