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🛡️ CVE-2023-53306 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

fsdax: force clear dirty mark if CoW

In the Linux kernel, the following vulnerability has been resolved:

fsdax: force clear dirty mark if CoW

XFS allows CoW on non-shared extents to combat fragmentation[1]. The old

non-shared extent could be mwrited before, its dax entry is marked dirty.

This results in a WARNing:

[ 28.512349] ------------[ cut here ]------------

[ 28.512622] WARNING: CPU: 2 PID: 5255 at fs/dax.c:390 dax_insert_entry+0x342/0x390

[ 28.513050] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache netfs nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables

[ 28.515462] CPU: 2 PID: 5255 Comm: fsstress Kdump: loaded Not tainted 6.3.0-rc1-00001-g85e1481e19c1-dirty #117

[ 28.515902] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS Arch Linux 1.16.1-1-1 04/01/2014

[ 28.516307] RIP: 0010:dax_insert_entry+0x342/0x390

[ 28.516536] Code: 30 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 8b 45 20 48 83 c0 01 e9 e2 fe ff ff 48 8b 45 20 48 83 c0 01 e9 cd fe ff ff <0f> 0b e9 53 ff ff ff 48 8b 7c 24 08 31 f6 e8 1b 61 a1 00 eb 8c 48

[ 28.517417] RSP: 0000:ffffc9000845fb18 EFLAGS: 00010086

[ 28.517721] RAX: 0000000000000053 RBX: 0000000000000155 RCX: 000000000018824b

[ 28.518113] RDX: 0000000000000000 RSI: ffffffff827525a6 RDI: 00000000ffffffff

[ 28.518515] RBP: ffffea00062092c0 R08: 0000000000000000 R09: ffffc9000845f9c8

[ 28.518905] R10: 0000000000000003 R11: ffffffff82ddb7e8 R12: 0000000000000155

[ 28.519301] R13: 0000000000000000 R14: 000000000018824b R15: ffff88810cfa76b8

[ 28.519703] FS: 00007f14a0c94740(0000) GS:ffff88817bd00000(0000) knlGS:0000000000000000

[ 28.520148] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

[ 28.520472] CR2: 00007f14a0c8d000 CR3: 000000010321c004 CR4: 0000000000770ee0

[ 28.520863] PKRU: 55555554

[ 28.521043] Call Trace:

[ 28.521219] <TASK>

[ 28.521368] dax_fault_iter+0x196/0x390

[ 28.521595] dax_iomap_pte_fault+0x19b/0x3d0

[ 28.521852] __xfs_filemap_fault+0x234/0x2b0

[ 28.522116] __do_fault+0x30/0x130

[ 28.522334] do_fault+0x193/0x340

[ 28.522586] __handle_mm_fault+0x2d3/0x690

[ 28.522975] handle_mm_fault+0xe6/0x2c0

[ 28.523259] do_user_addr_fault+0x1bc/0x6f0

[ 28.523521] exc_page_fault+0x60/0x140

[ 28.523763] asm_exc_page_fault+0x22/0x30

[ 28.524001] RIP: 0033:0x7f14a0b589ca

[ 28.524225] Code: c5 fe 7f 07 c5 fe 7f 47 20 c5 fe 7f 47 40 c5 fe 7f 47 60 c5 f8 77 c3 66 0f 1f 84 00 00 00 00 00 40 0f b6 c6 48 89 d1 48 89 fa <f3> aa 48 89 d0 c5 f8 77 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90

[ 28.525198] RSP: 002b:00007fff1dea1c98 EFLAGS: 00010202

[ 28.525505] RAX: 000000000000001e RBX: 000000000014a000 RCX: 0000000000006046

[ 28.525895] RDX: 00007f14a0c82000 RSI: 000000000000001e RDI: 00007f14a0c8d000

[ 28.526290] RBP: 000000000000006f R08: 0000000000000004 R09: 000000000014a000

[ 28.526681] R10: 0000000000000008 R11: 0000000000000246 R12: 028f5c28f5c28f5c

[ 28.527067] R13: 8f5c28f5c28f5c29 R14: 0000000000011046 R15: 00007f14a0c946c0

[ 28.527449] </TASK>

[ 28.527600] ---[ end trace 0000000000000000 ]---

To be able to delete this entry, clear its dirty mark before

invalidate_inode_pages2_range().

[1] https://lore.kernel.org/linux-xfs/20230321151339.GA11376@frogsfrogsfrogs/

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-53306 is recorded against 2 packages.

  • kernel (from 6.2.0 up to 6.2.11)
  • linux-kernel

Timeline and source

Published on 16 September 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-53306 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-09-16
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.2.0 6.2.11
linux-kernel — —

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