CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-47741 – btrfs: fix race setting file private on concurrent lseek using same fd
https://notcve.org/view.php?id=CVE-2024-47741
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix race setting file private on concurrent lseek using same fd When doing concurrent lseek(2) system calls against the same file descriptor, using multiple threads belonging to the same process, we have a short time window where a race happens and can result in a memory leak. The race happens like this: 1) A program opens a file descriptor for a file and then spawns two threads (with the pthreads library for example), lets call them task A and task B; 2) Task A calls lseek with SEEK_DATA or SEEK_HOLE and ends up at file.c:find_desired_extent() while holding a read lock on the inode; 3) At the start of find_desired_extent(), it extracts the file's private_data pointer into a local variable named 'private', which has a value of NULL; 4) Task B also calls lseek with SEEK_DATA or SEEK_HOLE, locks the inode in shared mode and enters file.c:find_desired_extent(), where it also extracts file->private_data into its local variable 'private', which has a NULL value; 5) Because it saw a NULL file private, task A allocates a private structure and assigns to the file structure; 6) Task B also saw a NULL file private so it also allocates its own file private and then assigns it to the same file structure, since both tasks are using the same file descriptor. At this point we leak the private structure allocated by task A. Besides the memory leak, there's also the detail that both tasks end up using the same cached state record in the private structure (struct btrfs_file_private::llseek_cached_state), which can result in a use-after-free problem since one task can free it while the other is still using it (only one task took a reference count on it). Also, sharing the cached state is not a good idea since it could result in incorrect results in the future - right now it should not be a problem because it end ups being used only in extent-io-tree.c:count_range_bits() where we do range validation before using the cached state. Fix this by protecting the private assignment and check of a file while holding the inode's spinlock and keep track of the task that allocated the private, so that it's used only by that task in order to prevent user-after-free issues with the cached state record as well as potentially using it incorrectly in the future. • https://git.kernel.org/stable/c/3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 https://git.kernel.org/stable/c/f56a6d9c267ec7fa558ede7755551c047b1034cd https://git.kernel.org/stable/c/a412ca489ac27b9d0e603499315b7139c948130d https://git.kernel.org/stable/c/33d1310d4496e904123dab9c28b2d8d2c1800f97 https://git.kernel.org/stable/c/7ee85f5515e86a4e2a2f51969795920733912bad •
CVSS: -EPSS: 0%CPEs: 9EXPL: 0CVE-2024-47740 – f2fs: Require FMODE_WRITE for atomic write ioctls
https://notcve.org/view.php?id=CVE-2024-47740
In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything. • https://git.kernel.org/stable/c/88b88a66797159949cec32eaab12b4968f6fae2d https://git.kernel.org/stable/c/700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653 https://git.kernel.org/stable/c/4ce87674c3a6b4d3b3d45f85b584ab8618a3cece https://git.kernel.org/stable/c/000bab8753ae29a259feb339b99ee759795a48ac https://git.kernel.org/stable/c/88ff021e1fea2d9b40b2d5efd9013c89f7be04ac https://git.kernel.org/stable/c/32f348ecc149e9ca70a1c424ae8fa9b6919d2713 https://git.kernel.org/stable/c/5e0de753bfe87768ebe6744d869caa92f35e5731 https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95 •
CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2024-47739 – padata: use integer wrap around to prevent deadlock on seq_nr overflow
https://notcve.org/view.php?id=CVE-2024-47739
In the Linux kernel, the following vulnerability has been resolved: padata: use integer wrap around to prevent deadlock on seq_nr overflow When submitting more than 2^32 padata objects to padata_do_serial, the current sorting implementation incorrectly sorts padata objects with overflowed seq_nr, causing them to be placed before existing objects in the reorder list. This leads to a deadlock in the serialization process as padata_find_next cannot match padata->seq_nr and pd->processed because the padata instance with overflowed seq_nr will be selected next. To fix this, we use an unsigned integer wrap around to correctly sort padata objects in scenarios with integer overflow. • https://git.kernel.org/stable/c/bfde23ce200e6d33291d29b9b8b60cc2f30f0805 https://git.kernel.org/stable/c/46c4079460f4dcaf445860679558eedef4e1bc91 https://git.kernel.org/stable/c/72164d5b648951684b1a593996b37a6083c61d7d https://git.kernel.org/stable/c/ab205e1c3846326f162180e56825b4ba38ce9c30 https://git.kernel.org/stable/c/1b8cf11b3ca593a8802a51802cd0c28c38501428 https://git.kernel.org/stable/c/9e279e6c1f012b82628b89e1b9c65dbefa8ca25a https://git.kernel.org/stable/c/1bd712de96ad7167fe0d608e706cd60587579f16 https://git.kernel.org/stable/c/9a22b2812393d93d84358a760c347c219 •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-47738 – wifi: mac80211: don't use rate mask for offchannel TX either
https://notcve.org/view.php?id=CVE-2024-47738
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: don't use rate mask for offchannel TX either Like the commit ab9177d83c04 ("wifi: mac80211: don't use rate mask for scanning"), ignore incorrect settings to avoid no supported rate warning reported by syzbot. The syzbot did bisect and found cause is commit 9df66d5b9f45 ("cfg80211: fix default HE tx bitrate mask in 2G band"), which however corrects bitmask of HE MCS and recognizes correctly settings of empty legacy rate plus HE MCS rate instead of returning -EINVAL. As suggestions [1], follow the change of SCAN TX to consider this case of offchannel TX as well. [1] https://lore.kernel.org/linux-wireless/6ab2dc9c3afe753ca6fdcdd1421e7a1f47e87b84.camel@sipsolutions.net/T/#m2ac2a6d2be06a37c9c47a3d8a44b4f647ed4f024 • https://git.kernel.org/stable/c/9df66d5b9f45c39b3925d16e8947cc10009b186d https://git.kernel.org/stable/c/1b728869a13470e4c25e8faf0dbb95a009c6850b https://git.kernel.org/stable/c/ccedf8163fa66f2db85d863a43f056ac69a5fef5 https://git.kernel.org/stable/c/5924678a442d0f5ebf33ebb76b470e68414f1318 https://git.kernel.org/stable/c/aafca50e71dc8f3192a5bfb325135a7908f3ef9e https://git.kernel.org/stable/c/d54455a3a965feb547711aff7afd2ca5deadb99c https://git.kernel.org/stable/c/3565ef215101ffadb5fe5394c70b1fca51376b25 https://git.kernel.org/stable/c/43897111481b679508711d3ca881c4c65 •
CVSS: -EPSS: 0%CPEs: 9EXPL: 0CVE-2024-47737 – nfsd: call cache_put if xdr_reserve_space returns NULL
https://notcve.org/view.php?id=CVE-2024-47737
In the Linux kernel, the following vulnerability has been resolved: nfsd: call cache_put if xdr_reserve_space returns NULL If not enough buffer space available, but idmap_lookup has triggered lookup_fn which calls cache_get and returns successfully. Then we missed to call cache_put here which pairs with cache_get. Reviwed-by: Jeff Layton <jlayton@kernel.org> • https://git.kernel.org/stable/c/ddd1ea56367202f6c99135cd59de7a97af4c4ffd https://git.kernel.org/stable/c/3e8081ebff12bec1347deaceb6bce0765cce54df https://git.kernel.org/stable/c/c6b16e700cf4d959af524bd9d3978407ff7ce462 https://git.kernel.org/stable/c/9f03f0016ff797932551881c7e06ae50e9c39134 https://git.kernel.org/stable/c/9803ab882d565a8fb2dde5999d98866d1c499dfd https://git.kernel.org/stable/c/81821617312988096f5deccf0f7da6f888e98056 https://git.kernel.org/stable/c/a1afbbb5276f943ad7173d0b4c626b8c75a260da https://git.kernel.org/stable/c/e32ee6a61041925d1a05c14d10352dcfc •