Ubuntu: (Multiple Advisories) (CVE-2024-39501): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: drivers: core: synchronize really_probe() and dev_uevent() Synchronize the dev->driver usage in really_probe() and dev_uevent(). These can run in different threads, what can result in the following race condition for dev->driver uninitialization: Thread #1: ========== really_probe() { ... probe_failed: ... device_unbind_cleanup(dev) { ... dev->driver = NULL; // <= Failed probe sets dev->driver to NULL ... } ... } Thread #2: ========== dev_uevent() { ... if (dev->driver) // If dev->driver is NULLed from really_probe() from here on, // after above check, the system crashes add_uevent_var(env, "DRIVER=%s", dev->driver->name); ... } really_probe() holds the lock, already. So nothing needs to be done there. dev_uevent() is called with lock held, often, too. But not always. What implies that we can't add any locking in dev_uevent() itself. So fix this race by adding the lock to the non-protected path. This is the path where above race is observed: dev_uevent+0x235/0x380 uevent_show+0x10c/0x1f0 <= Add lock here dev_attr_show+0x3a/0xa0 sysfs_kf_seq_show+0x17c/0x250 kernfs_seq_show+0x7c/0x90 seq_read_iter+0x2d7/0x940 kernfs_fop_read_iter+0xc6/0x310 vfs_read+0x5bc/0x6b0 ksys_read+0xeb/0x1b0 __x64_sys_read+0x42/0x50 x64_sys_call+0x27ad/0x2d30 do_syscall_64+0xcd/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f Similar cases are reported by syzkaller in https://syzkaller.appspot.com/bug?extid=ffa8143439596313a85a But these are regarding the *initialization* of dev->driver dev->driver = drv; As this switches dev->driver to non-NULL these reports can be considered to be false-positives (which should be "fixed" by this commit, as well, though). The same issue was reported and tried to be fixed back in 2015 in https://lore.kernel.org/lkml/1421259054-2574-1-git-send-email-a.sangwan@samsung.com/ already.
Solution(s)
- ubuntu-upgrade-linux-image-5-15-0-1035-xilinx-zynqmp
- ubuntu-upgrade-linux-image-5-15-0-1052-gkeop
- ubuntu-upgrade-linux-image-5-15-0-1062-ibm
- ubuntu-upgrade-linux-image-5-15-0-1062-raspi
- ubuntu-upgrade-linux-image-5-15-0-1064-intel-iotg
- ubuntu-upgrade-linux-image-5-15-0-1064-nvidia
- ubuntu-upgrade-linux-image-5-15-0-1064-nvidia-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-1066-gke
- ubuntu-upgrade-linux-image-5-15-0-1066-kvm
- ubuntu-upgrade-linux-image-5-15-0-1067-oracle
- ubuntu-upgrade-linux-image-5-15-0-1068-gcp
- ubuntu-upgrade-linux-image-5-15-0-1069-aws
- ubuntu-upgrade-linux-image-5-15-0-1072-azure
- ubuntu-upgrade-linux-image-5-15-0-1072-azure-fde
- ubuntu-upgrade-linux-image-5-15-0-121-generic
- ubuntu-upgrade-linux-image-5-15-0-121-generic-64k
- ubuntu-upgrade-linux-image-5-15-0-121-generic-lpae
- ubuntu-upgrade-linux-image-5-15-0-121-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-121-lowlatency-64k
- ubuntu-upgrade-linux-image-5-4-0-1043-iot
- ubuntu-upgrade-linux-image-5-4-0-1051-xilinx-zynqmp
- ubuntu-upgrade-linux-image-5-4-0-1079-ibm
- ubuntu-upgrade-linux-image-5-4-0-1092-bluefield
- ubuntu-upgrade-linux-image-5-4-0-1099-gkeop
- ubuntu-upgrade-linux-image-5-4-0-1116-raspi
- ubuntu-upgrade-linux-image-5-4-0-1120-kvm
- ubuntu-upgrade-linux-image-5-4-0-1131-oracle
- ubuntu-upgrade-linux-image-5-4-0-1132-aws
- ubuntu-upgrade-linux-image-5-4-0-1136-gcp
- ubuntu-upgrade-linux-image-5-4-0-1137-azure
- ubuntu-upgrade-linux-image-5-4-0-195-generic
- ubuntu-upgrade-linux-image-5-4-0-195-generic-lpae
- ubuntu-upgrade-linux-image-5-4-0-195-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1010-gke
- ubuntu-upgrade-linux-image-6-8-0-1011-raspi
- ubuntu-upgrade-linux-image-6-8-0-1012-ibm
- ubuntu-upgrade-linux-image-6-8-0-1012-oem
- ubuntu-upgrade-linux-image-6-8-0-1012-oracle
- ubuntu-upgrade-linux-image-6-8-0-1012-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1014-azure
- ubuntu-upgrade-linux-image-6-8-0-1014-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1014-gcp
- ubuntu-upgrade-linux-image-6-8-0-1015-aws
- ubuntu-upgrade-linux-image-6-8-0-44-generic
- ubuntu-upgrade-linux-image-6-8-0-44-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-44-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-44-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-45-generic
- ubuntu-upgrade-linux-image-6-8-0-45-generic-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-aws-lts-20-04
- ubuntu-upgrade-linux-image-aws-lts-22-04
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-cvm
- ubuntu-upgrade-linux-image-azure-fde
- ubuntu-upgrade-linux-image-azure-fde-lts-22-04
- ubuntu-upgrade-linux-image-azure-lts-20-04
- ubuntu-upgrade-linux-image-azure-lts-22-04
- ubuntu-upgrade-linux-image-bluefield
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-gcp-lts-20-04
- ubuntu-upgrade-linux-image-gcp-lts-22-04
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
- ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-18-04
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- ubuntu-upgrade-linux-image-generic-lpae
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- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-gke-5-15
- ubuntu-upgrade-linux-image-gkeop
- ubuntu-upgrade-linux-image-gkeop-5-15
- ubuntu-upgrade-linux-image-gkeop-5-4
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-20-04
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-intel
- ubuntu-upgrade-linux-image-intel-iotg
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
- ubuntu-upgrade-linux-image-lowlatency-64k-hwe-22-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-6-8
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-nvidia-64k-6-8
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-oem
- ubuntu-upgrade-linux-image-oem-20-04
- ubuntu-upgrade-linux-image-oem-20-04b
- ubuntu-upgrade-linux-image-oem-20-04c
- ubuntu-upgrade-linux-image-oem-20-04d
- ubuntu-upgrade-linux-image-oem-22-04
- ubuntu-upgrade-linux-image-oem-22-04a
- ubuntu-upgrade-linux-image-oem-22-04b
- ubuntu-upgrade-linux-image-oem-22-04c
- ubuntu-upgrade-linux-image-oem-22-04d
- ubuntu-upgrade-linux-image-oem-osp1
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-oracle-lts-20-04
- ubuntu-upgrade-linux-image-oracle-lts-22-04
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-raspi-hwe-18-04
- ubuntu-upgrade-linux-image-raspi-nolpae
- ubuntu-upgrade-linux-image-raspi2
- ubuntu-upgrade-linux-image-raspi2-hwe-18-04
- ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-18-04
- ubuntu-upgrade-linux-image-virtual-hwe-20-04
- ubuntu-upgrade-linux-image-virtual-hwe-22-04
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
- ubuntu-upgrade-linux-image-xilinx-zynqmp
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