NVD / CVE Program· CNA Linux

CVE-2024-53177: smb: prevent use-after-free due to open_cached_dir error paths

Noroxi assessment

Priority: Monitor (action score 39/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.55% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 47655a12c6b1bca8fa230085eab2e85a076932b7, 6.2, 6.6.

Low priority for now. Upgrade to Linux Linux 47655a12c6b1bca8fa230085eab2e85a076932b7, 6.2, 6.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: smb: prevent use-after-free due to open_cached_dir error paths If open_cached_dir() encounters an error parsing the lease from the server, the error handling may race with receiving a lease break, resulting in open_cached_dir() freeing the cfid while the queued work is pending. Update open_cached_dir() to drop refs rather than directly freeing the cfid. Have cached_dir_lease_break(), cfids_laundromat_worker(), and invalidate_all_cached_dirs() clear has_lease immediately while still holding cfids->cfid_list_lock, and then use this to also simplify the reference counting in cfids_laundromat_worker() and invalidate_all_cached_dirs(). Fixes this KASAN splat (which manually injects an error and lease break in open_cached_dir()): ================================================================== BUG: KASAN: slab-use-after-free in smb2_cached_lease_break+0x27/0xb0 Read of size 8 at addr ffff88811cc24c10 by task kworker/3:1/65 CPU: 3 UID: 0 PID: 65 Comm: kworker/3:1 Not tainted 6.12.0-rc6-g255cf264e6e5-dirty #87 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Workqueue: cifsiod smb2_cached_lease_break Call Trace: <TASK> dump_stack_lvl+0x77/0xb0 print_report+0xce/0x660 kasan_report+0xd3/0x110 smb2_cached_lease_break+0x27/0xb0 process_one_work+0x50a/0xc50 worker_thread+0x2ba/0x530 kthread+0x17c/0x1c0 ret_from_fork+0x34/0x60 ret_from_fork_asm+0x1a/0x30 </TASK> Allocated by task 2464: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0xaa/0xb0 open_cached_dir+0xa7d/0x1fb0 smb2_query_path_info+0x43c/0x6e0 cifs_get_fattr+0x346/0xf10 cifs_get_inode_info+0x157/0x210 cifs_revalidate_dentry_attr+0x2d1/0x460 cifs_getattr+0x173/0x470 vfs_statx_path+0x10f/0x160 vfs_statx+0xe9/0x150 vfs_fstatat+0x5e/0xc0 __do_sys_newfstatat+0x91/0xf0 do_syscall_64+0x95/0x1a0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 2464: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x51/0x70 kfree+0x174/0x520 open_cached_dir+0x97f/0x1fb0 smb2_query_path_info+0x43c/0x6e0 cifs_get_fattr+0x346/0xf10 cifs_get_inode_info+0x157/0x210 cifs_revalidate_dentry_attr+0x2d1/0x460 cifs_getattr+0x173/0x470 vfs_statx_path+0x10f/0x160 vfs_statx+0xe9/0x150 vfs_fstatat+0x5e/0xc0 __do_sys_newfstatat+0x91/0xf0 do_syscall_64+0x95/0x1a0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Last potentially related work creation: kasan_save_stack+0x33/0x60 __kasan_record_aux_stack+0xad/0xc0 insert_work+0x32/0x100 __queue_work+0x5c9/0x870 queue_work_on+0x82/0x90 open_cached_dir+0x1369/0x1fb0 smb2_query_path_info+0x43c/0x6e0 cifs_get_fattr+0x346/0xf10 cifs_get_inode_info+0x157/0x210 cifs_revalidate_dentry_attr+0x2d1/0x460 cifs_getattr+0x173/0x470 vfs_statx_path+0x10f/0x160 vfs_statx+0xe9/0x150 vfs_fstatat+0x5e/0xc0 __do_sys_newfstatat+0x91/0xf0 do_syscall_64+0x95/0x1a0 entry_SYSCALL_64_after_hwframe+0x76/0x7e The buggy address belongs to the object at ffff88811cc24c00 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 16 bytes inside of freed 1024-byte region [ffff88811cc24c00, ffff88811cc25000)

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Published: Dec 27, 2024
Updated: Oct 30, 2026
EPSS: 0.5% · 46th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 9.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

ProductVersion

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernelbefore 6.6.64
linux linux kernel6.7 and later · before 6.11.11
linux linux kernel6.12 and later · before 6.12.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 06c106e1e8568e840c946cc0222579e3d29dab8e, 6db94d08359c43f2c8fe372811cdee04564a41b9, 6.7affected
- 93877b9afc2994c89362007aac480a7b150f386f and later · before 791f833053578b9fd24252ebb7162a61bc3f805baffected · git
- 5c86919455c1edec99ebd3338ad213b59271a71b and later · before 97e2afcac0bebfef6a5360f4267ce4c44507b845affected · git
- 5c86919455c1edec99ebd3338ad213b59271a71b and later · before 47655a12c6b1bca8fa230085eab2e85a076932b7affected · git
- 5c86919455c1edec99ebd3338ad213b59271a71b and later · before a9685b409a03b73d2980bbfa53eb47555802d0a9affected · git
- 6.6.3 and later · before 6.6.64affected · semver
- 6.1.191 and later · before 6.2affected · semver
- 6.5.13 and later · before 6.6affected · semver
- before 6.7not affected · semver
- 6.6.64 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:13	linux	before 6.12.3-1	6.12.3-1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-64kb	before 5.14.21-150400.24.176.1	5.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-64kb	before 5.14.21-150400.24.150.1	5.14.21-150400.24.150.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-docs	before 5.14.21-150400.24.176.1	5.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-docs	before 5.14.21-150400.24.150.1	5.14.21-150400.24.150.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-obs-build	before 5.14.21-150400.24.176.1	5.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-obs-build	before 5.14.21-150400.24.150.1	5.14.21-150400.24.150.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-source	before 5.14.21-150400.24.176.1	5.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-source	before 5.14.21-150400.24.150.1	5.14.21-150400.24.150.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-syms	before 5.14.21-150400.24.176.1	5.14.21-150400.24.176.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-syms	before 5.14.21-150400.24.150.1	5.14.21-150400.24.150.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS	kernel-64kb	before 5.14.21-150500.55.121.2	5.14.21-150500.55.121.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS	kernel-docs	before 5.14.21-150500.55.121.1	5.14.21-150500.55.121.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS	kernel-obs-build	before 5.14.21-150500.55.121.1	5.14.21-150500.55.121.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS	kernel-syms	before 5.14.21-150500.55.121.1	5.14.21-150500.55.121.1
SUSE:Linux Enterprise Live Patching 15 SP4	kernel-livepatch-SLE15-SP4_Update_36	before 1-150400.9.3.1	1-150400.9.3.1
SUSE:Linux Enterprise Live Patching 15 SP5	kernel-livepatch-SLE15-SP5_Update_30	before 1-150500.11.5.1	1-150500.11.5.1
SUSE:Linux Enterprise Micro 5.3	kernel-default	before 5.14.21-150400.24.150.1	5.14.21-150400.24.150.1
SUSE:Linux Enterprise Micro 5.3	kernel-default	before 5.14.21-150400.24.176.1	5.14.21-150400.24.176.1
SUSE:Linux Enterprise Micro 5.3	kernel-default-base	before 5.14.21-150400.24.176.1.150400.24.90.1	5.14.21-150400.24.176.1.150400.24.90.1
SUSE:Linux Enterprise Micro 5.3	kernel-default-base	before 5.14.21-150400.24.150.1.150400.24.74.1	5.14.21-150400.24.150.1.150400.24.74.1
SUSE:Linux Enterprise Micro 5.3	kernel-rt	before 5.14.21-150400.15.130.1	5.14.21-150400.15.130.1
SUSE:Linux Enterprise Micro 5.3	kernel-rt	before 5.14.21-150400.15.109.1	5.14.21-150400.15.109.1
SUSE:Linux Enterprise Micro 5.3	kernel-source-rt	before 5.14.21-150400.15.109.1	5.14.21-150400.15.109.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2024-53170Dec 27, 2024 · block: fix uaf for flush rq while iterating tags
31Monitor
← EarlierCVE-2024-53172Dec 27, 2024 · ubi: fastmap: Fix duplicate slab cache names while attaching
22Monitor
Later →CVE-2024-53178Dec 27, 2024 · smb: Don't leak cfid when reconnect races with open_cached_dir
18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	47655a12c6b1bca8fa230085eab2e85a076932b7	Vendor (CNA)
Linux Linux	6.2	Vendor (CNA)
Linux Linux	6.6	Vendor (CNA)
Linux Linux	6.6.64	Vendor (CNA)
Linux Linux	791f833053578b9fd24252ebb7162a61bc3f805b	Vendor (CNA)
Linux Linux	97e2afcac0bebfef6a5360f4267ce4c44507b845	Vendor (CNA)
Linux Linux	a9685b409a03b73d2980bbfa53eb47555802d0a9	Vendor (CNA)
debian:linux	6.12.3-1 · Debian:13	Package registry (OSV)
suse:kernel-64kb	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:kernel-default	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise Micro 5.3	Package registry (OSV)
suse:kernel-default-base	5.14.21-150400.24.176.1.150400.24.90.1 · SUSE:Linux Enterprise Micro 5.3	Package registry (OSV)
suse:kernel-docs	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP4_Update_36	1-150400.9.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP5_Update_30	1-150500.11.5.1 · SUSE:Linux Enterprise Live Patching 15 SP5	Package registry (OSV)
suse:kernel-obs-build	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:kernel-rt	5.14.21-150500.13.106.1 · SUSE:Linux Enterprise Micro 5.5	Package registry (OSV)
suse:kernel-source	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:kernel-source-rt	5.14.21-150500.13.106.1 · SUSE:Linux Enterprise Micro 5.5	Package registry (OSV)
suse:kernel-syms	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:kernel-zfcpdump	5.14.21-150400.24.176.1 · SUSE:Linux Enterprise Server 15 SP4-LTSS	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/47655a12c6b1bca8fa230085eab2e85a076932b7

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records