btrfs_fixes

btrfsfixes: Custom BTRFS Repair Tools Custom tools written during recovery of a 12TB multi-device BTRFS pool with severe extent tree corruption that the native commands btrfs check --repair, --init-extent-tree, etc. could not repair. SeeINCIDENT-ANALYSIS.md for a structured case study of the...

ffs

FFS - F File System This is a cli tool for searching files like grep that does not use the OS kernel to read files, but reads your disks directly. It is practically useless, but insanely cool. this is just 1.5k lines of C code that: requires sudo only when reading a raw device node e.g. /dev/rdis...

USN-9018-1 linux, linux-aws, linux-gcp, linux-ibm, linux-oem-7.0, linux-oracle vulnerabilities

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Network file systems library; - Stream parser; - ARM64 architecture; - PowerPC architecture; - RISC-V architecture;...

SUSE SLES12: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:5121-1)

The remote SUSE Linux SLES12 / SLESSAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:5121-1 advisory. The SUSE Linux Enterprise 12 SP5 kernel was updated to fix various security issues: The following security issues were fixed: -...

CVE-2026-98959

A flaw was found in the Linux kernel's Btrfs file system. A local user can cause a Denial of Service DoS and file system corruption by replacing an extended attribute xattr with a value of a different size on files where multiple attributes share the same directory item. Because the kernel fails ...

Astra Linux – vulnerability in linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: always return -EIOCBQUEUED after btrfsuringreadextentendio If all bios finish before btrfsencodedreadregularfillpages returns, it calls btrfsuringreadextentendio and previously returned the I/O status. A negative errno the...

Astra Linux – vulnerability in linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix extent map leak in NOCOW direct I/O write btrfsdioiomapbegin calls btrfsgetextent, which returns an extent map reference that must be dropped on all exit paths. For direct writes into a NOCOW range,...

Astra Linux – vulnerability in linux-6.1, linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: fixed memory leak in btrfsdoencodedwrite Local fuzzing of 6.12.94 identified the following memory leak: Unreferenced object 0xffff888018050a80 size 64: comm "syz.0.17", pid 10297, jiffies 4294953601 hex dump first 32 bytes...

Astra Linux – vulnerability in linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix transaction use-after-free in raid stripe insertion If allocation of a RAID stripe extent fails, btrfsinsertoneraidextent aborts and ends the transaction before returning -ENOMEM. btrfsfinishoneordered, the production...

Astra Linux – vulnerability in linux-6.1

In the Linux kernel, the following vulnerability has been resolved: btrfs: balance: fix potential bg lookup failure in btrfsmayallocdatachunk BUG Running btrfs balance can trigger a null-ptr-deref before relocating a data chunk when metadata corruption leaves a chunk in the chunk tree without a...

Astra Linux – vulnerability in linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix deadlock between metadata writeback and transaction commit When writing out metadata extent buffers in a zoned filesystem, btreewritepages holds fsinfo-zonedmetaiolock across the entire writeback loop, including...

Astra Linux – vulnerability in linux-6.1, linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix root leak if its reloc root is unexpected in mergerelocroots If we have an unexpected relocroot for our root, we jump to the out label but never drop the reference we obtained for root, resulting in a leak. Add a missi...

Astra Linux – vulnerability in linux-6.12

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix EEXIST abort due to non-consecutive gaps in chunk allocation I have observed that several systems abort at insertdevextents within btrfscreatependingblockgroups. Below is a sample stack trace of such an abort occurring...

Astra Linux – vulnerability in linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: initialize inode mapping flags for cached inodes BUG When running generic/795 with 8K block size, 4K page size, the test always fails, triggering some ASSERTs related to folio size: 795 241074: dropcaches: 3 assertion...

Astra Linux – vulnerability in linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: clear free space tree creation state on rebuild failure btrfsrebuildfreespacetree sets BTRFSFSCREATINGFREESPACETREE before rebuilding the free space tree. Several error paths return without clearing this flag. The...

Astra Linux – vulnerability in linux-6.1

In the Linux kernel, the following vulnerability has been resolved: btrfs: tree-checker: validate names in ROOTREF and ROOTBACKREF ROOTREF and ROOTBACKREF entries contain a struct btrfsrootref followed by the subvolume name. Several readers assume that this layout is already valid and then use th...

Astra Linux – vulnerability in linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: check if root is readonly when setting posix acl For a filesystem where the btrfs read-only property is set to true, all write operations including acl and xattr should be denied. However, anacl can still be set even if...

Astra Linux – vulnerability in linux-6.1, linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not trim a device which is not writeable BUG There is a bug report indicating that btrfs/242 may randomly fail due to a NULL pointer dereference: run fstests btrfs/242 at 2026-06-01 10:25:08 BTRFS: device fsid...

Astra Linux – vulnerability in linux-6.1, linux-6.12, linux-6.18

In the Linux kernel, the following vulnerability has been resolved: btrfs: tree-checker: validate INODEREF's namelen BUG A crafted btrfs image can trigger the following crash: BUG: unable to handle page fault for address: ffffd1dc42884000 PF: supervisor write access in kernel mode PF:...

Security update for the Linux Kernel

The SUSE Linux Enterprise 12 SP5 kernel was updated to fix various security issues: The following security issues were fixed: CVE-2025-40100: btrfs: do not assert we found block group item when creating free space tree bsc1252918. CVE-2025-68741: scsi: qla2xxx: Fix improper freeing of purex item...