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CVE-2023-54080: btrfs: zoned: skip splitting and logical rewriting on pre-alloc write

In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: skip splitting and logical rewriting on pre-alloc write When doing a relocation, there is a chance that at the time of btrfs_reloc_clone_csums(), there is no checksum for the corresponding region. In this case, btrfs_finish_ordered_zoned()'s sum points to an invalid item and so ordered_extent's logical is set to some invalid value. Then, btrfs_lookup_block_group() in btrfs_zone_finish_endio() failed to find a block group and will hit an assert or a null pointer dereference as following. This can be reprodcued by running btrfs/028 several times (e.g, 4 to 16 times) with a null_blk setup. The device's zone size and capacity is set to 32 MB and the storage size is set to 5 GB on my setup. KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] CPU: 6 PID: 3105720 Comm: kworker/u16:13 Tainted: G W 6.5.0-rc6-kts+ #1 Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015 Workqueue: btrfs-endio-write btrfs_work_helper [btrfs] RIP: 0010:btrfs_zone_finish_endio.part.0+0x34/0x160 [btrfs] Code: 41 54 49 89 fc 55 48 89 f5 53 e8 57 7d fc ff 48 8d b8 88 00 00 00 48 89 c3 48 b8 00 00 00 00 00 > 3c 02 00 0f 85 02 01 00 00 f6 83 88 00 00 00 01 0f 84 a8 00 00 RSP: 0018:ffff88833cf87b08 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000011 RSI: 0000000000000004 RDI: 0000000000000088 RBP: 0000000000000002 R08: 0000000000000001 R09: ffffed102877b827 R10: ffff888143bdc13b R11: ffff888125b1cbc0 R12: ffff888143bdc000 R13: 0000000000007000 R14: ffff888125b1cba8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88881e500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3ed85223d5 CR3: 00000001519b4005 CR4: 00000000001706e0 Call Trace: <TASK> ? die_addr+0x3c/0xa0 ? exc_general_protection+0x148/0x220 ? asm_exc_general_protection+0x22/0x30 ? btrfs_zone_finish_endio.part.0+0x34/0x160 [btrfs] ? btrfs_zone_finish_endio.part.0+0x19/0x160 [btrfs] btrfs_finish_one_ordered+0x7b8/0x1de0 [btrfs] ? rcu_is_watching+0x11/0xb0 ? lock_release+0x47a/0x620 ? btrfs_finish_ordered_zoned+0x59b/0x800 [btrfs] ? __pfx_btrfs_finish_one_ordered+0x10/0x10 [btrfs] ? btrfs_finish_ordered_zoned+0x358/0x800 [btrfs] ? __smp_call_single_queue+0x124/0x350 ? rcu_is_watching+0x11/0xb0 btrfs_work_helper+0x19f/0xc60 [btrfs] ? __pfx_try_to_wake_up+0x10/0x10 ? _raw_spin_unlock_irq+0x24/0x50 ? rcu_is_watching+0x11/0xb0 process_one_work+0x8c1/0x1430 ? __pfx_lock_acquire+0x10/0x10 ? __pfx_process_one_work+0x10/0x10 ? __pfx_do_raw_spin_lock+0x10/0x10 ? _raw_spin_lock_irq+0x52/0x60 worker_thread+0x100/0x12c0 ? __kthread_parkme+0xc1/0x1f0 ? __pfx_worker_thread+0x10/0x10 kthread+0x2ea/0x3c0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x30/0x70 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> On the zoned mode, writing to pre-allocated region means data relocation write. Such write always uses WRITE command so there is no need of splitting and rewriting logical address. Thus, we can just skip the function for the case.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel Btrfs zoned-mode crash bug. Under specific relocation and pre-allocated write conditions, the kernel can hit an assertion or null pointer dereference, affecting availability of systems using that storage configuration.

Executive priority

Treat this as a targeted availability risk for Linux storage systems using Btrfs zoned mode. Patch through normal kernel maintenance, faster where affected storage configurations support business-critical workloads.

Technical view

During Btrfs zoned relocation, missing checksums can leave an ordered extent with an invalid logical address. btrfs_lookup_block_group() can then fail in btrfs_zone_finish_endio(), leading to an assertion or null pointer dereference. The fix skips splitting and logical rewriting for pre-allocated zoned writes.

Likely exposure

Exposure appears limited to Linux systems using Btrfs in zoned mode with affected kernel versions identified in the source bundle, including 6.5, 6.5.3, and 6.6 entries. General Linux hosts not using Btrfs zoned mode are less likely to be exposed.

Exploitation context

No source in the bundle reports active exploitation, and the CVE is not marked KEV. The provided reproduction context is a repeated Btrfs test case using null_blk with specific zoned device sizing, indicating specialized local conditions rather than broad remote exploitability.

Researcher notes

The public record provides crash details and upstream stable commit references, but no CVSS, CWE, exploit report, or distribution-specific fixed package list. Version metadata is sparse, so validate exposure against actual kernel provenance and vendor backports.

Mitigation direction

  • Check your Linux distribution for kernel updates containing the referenced stable fixes.
  • Prioritize systems using Btrfs zoned mode or zoned block devices.
  • Confirm whether vendor kernels backported the Btrfs zoned pre-allocated write fix.
  • Follow vendor advisories if package names or fixed versions differ from upstream commits.

Validation and detection

  • Inventory Linux systems running Btrfs in zoned mode.
  • Compare deployed kernels against vendor fixed versions or the referenced upstream commits.
  • Review kernel crash logs for Btrfs zoned endio null pointer dereference patterns.
  • Test storage workloads in staging after applying the vendor kernel update.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors
3Timeline events
0ADP providers
3Source links

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  2. CVE publishedCVE Program

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  3. CVE updatedCVE Program

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxcbfce4c7fbde23cc8bcba44822a58c728caf6ec9, cbfce4c7fbde23cc8bcba44822a58c728caf6ec9unaffected
LinuxLinux6.5, 0, 6.5.3, 6.6affected
Weakness

CWE details

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