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NVD / CVE Program· CNA Linux

CVE-2023-52434: smb: client: fix potential OOBs in smb2_parse_contexts()

HighCVSS 8.0 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 1% (FIRST EPSS); higher than 63.8% of all records.
  • Someone on the same network segment can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 13fb0fc4917621f3dfa285a27eaf7151d770b5e5, 17a0f64cc02d4972e21c733d9f21d1c512963afa, 1ae3c59355dc9882e09c020afe8ffbd895ad0f29.

Low priority for now. Upgrade to Linux Linux 13fb0fc4917621f3dfa285a27eaf7151d770b5e5, 17a0f64cc02d4972e21c733d9f21d1c512963afa, 1ae3c59355dc9882e09c020afe8ffbd895ad0f29 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: client: fix potential OOBs in smb2_parse_contexts() Validate offsets and lengths before dereferencing create contexts in smb2_parse_contexts(). This fixes following oops when accessing invalid create contexts from server: BUG: unable to handle page fault for address: ffff8881178d8cc3 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 4a01067 P4D 4a01067 PUD 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 3 PID: 1736 Comm: mount.cifs Not tainted 6.7.0-rc4 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 RIP: 0010:smb2_parse_contexts+0xa0/0x3a0 [cifs] Code: f8 10 75 13 48 b8 93 ad 25 50 9c b4 11 e7 49 39 06 0f 84 d2 00 00 00 8b 45 00 85 c0 74 61 41 29 c5 48 01 c5 41 83 fd 0f 76 55 <0f> b7 7d 04 0f b7 45 06 4c 8d 74 3d 00 66 83 f8 04 75 bc ba 04 00 RSP: 0018:ffffc900007939e0 EFLAGS: 00010216 RAX: ffffc90000793c78 RBX: ffff8880180cc000 RCX: ffffc90000793c90 RDX: ffffc90000793cc0 RSI: ffff8880178d8cc0 RDI: ffff8880180cc000 RBP: ffff8881178d8cbf R08: ffffc90000793c22 R09: 0000000000000000 R10: ffff8880180cc000 R11: 0000000000000024 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000000 R15: ffffc90000793c22 FS: 00007f873753cbc0(0000) GS:ffff88806bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8881178d8cc3 CR3: 00000000181ca000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ? __die+0x23/0x70 ? page_fault_oops+0x181/0x480 ? search_module_extables+0x19/0x60 ? srso_alias_return_thunk+0x5/0xfbef5 ? exc_page_fault+0x1b6/0x1c0 ? asm_exc_page_fault+0x26/0x30 ? smb2_parse_contexts+0xa0/0x3a0 [cifs] SMB2_open+0x38d/0x5f0 [cifs] ? smb2_is_path_accessible+0x138/0x260 [cifs] smb2_is_path_accessible+0x138/0x260 [cifs] cifs_is_path_remote+0x8d/0x230 [cifs] cifs_mount+0x7e/0x350 [cifs] cifs_smb3_do_mount+0x128/0x780 [cifs] smb3_get_tree+0xd9/0x290 [cifs] vfs_get_tree+0x2c/0x100 ? capable+0x37/0x70 path_mount+0x2d7/0xb80 ? srso_alias_return_thunk+0x5/0xfbef5 ? _raw_spin_unlock_irqrestore+0x44/0x60 __x64_sys_mount+0x11a/0x150 do_syscall_64+0x47/0xf0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f8737657b1e

Published
Feb 20, 2024
Updated
Aug 5, 2026
EPSS
1.0% · 63th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.0
CNA · Linux
8.1
0.1 point gap

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

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

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • 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.

VendorProduct
linuxlinux kernel
debiandebian linux

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

    • 3.7affected
    • b8c32dbb0deb287a5fcb78251e4eae6c7275760d and later · before 6726429c18c62dbf5e96ebbd522f262e016553fbaffected · git
    • b8c32dbb0deb287a5fcb78251e4eae6c7275760d and later · before 13fb0fc4917621f3dfa285a27eaf7151d770b5e5affected · git
    • b8c32dbb0deb287a5fcb78251e4eae6c7275760d and later · before 890bc4fac3c0973a49cac35f634579bebba7fe48affected · git
    • b8c32dbb0deb287a5fcb78251e4eae6c7275760d and later · before 1ae3c59355dc9882e09c020afe8ffbd895ad0f29affected · git
    • b8c32dbb0deb287a5fcb78251e4eae6c7275760d and later · before 17a0f64cc02d4972e21c733d9f21d1c512963afaaffected · git
    • b8c32dbb0deb287a5fcb78251e4eae6c7275760d and later · before af1689a9b7701d9907dfc84d2a4b57c4bc907144affected · git
    • before 3.7not affected · semver
    • 5.4.277 and later · up to and including 5.4.*not affected · semver
    • 5.10.211 and later · up to and including 5.10.*not affected · semver
Affected versions · NVD (7)

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

  • debian debian linux10.0
  • linux linux kernel5.5 and later · before 5.10.211
  • linux linux kernel5.11 and later · before 5.15.150
  • linux linux kernel5.3 and later · before 5.4.277
  • linux linux kernel6.2 and later · before 6.6.8
  • linux linux kernel5.16 and later · up to 6.1.79 inclusive
  • linux linux kernel6.7

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:10linux-5.10before 5.10.216-1~deb10u15.10.216-1~deb10u1
Debian:11linuxbefore 5.10.216-15.10.216-1
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.6.8-16.6.8-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.7.16.4.0-150600.23.7.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.5.46.4.0-150600.8.5.4
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.7.3.150600.12.2.76.4.0-150600.23.7.3.150600.12.2.7
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.7.46.4.0-150600.23.7.4
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.7.16.4.0-150600.23.7.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.7.26.4.0-150600.23.7.2
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.5.46.4.0-150600.8.5.4
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.7.16.4.0-150600.23.7.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.5.16.4.0-150600.8.5.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.7.36.4.0-150600.23.7.3
Red Hat:rhel_aus:8.6::baseosbpftoolbefore 0:4.18.0-372.119.1.el8_60:4.18.0-372.119.1.el8_6
Red Hat:rhel_aus:8.6::baseosbpftool-debuginfobefore 0:4.18.0-372.119.1.el8_60:4.18.0-372.119.1.el8_6
Red Hat:rhel_aus:8.6::baseoskernelbefore 0:4.18.0-372.119.1.el8_60:4.18.0-372.119.1.el8_6
Red Hat:rhel_aus:8.6::baseoskernel-abi-stablelistsbefore 0:4.18.0-372.119.1.el8_60:4.18.0-372.119.1.el8_6
Red Hat:rhel_aus:8.6::baseoskernel-corebefore 0:4.18.0-372.119.1.el8_60:4.18.0-372.119.1.el8_6

+96

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-2023-52433Feb 20, 2024 · netfilter: nft_set_rbtree: skip sync GC for new elements in this transaction
    31Monitor
  • ← EarlierCVE-2024-26581Feb 20, 2024 · netfilter: nft_set_rbtree: skip end interval element from gc
    32Monitor
  • Later →CVE-2023-52435Feb 20, 2024 · net: prevent mss overflow in skb_segment()
    22Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Linux Linux13fb0fc4917621f3dfa285a27eaf7151d770b5e5Vendor (CNA)
Linux Linux17a0f64cc02d4972e21c733d9f21d1c512963afaVendor (CNA)
Linux Linux1ae3c59355dc9882e09c020afe8ffbd895ad0f29Vendor (CNA)
Linux Linux6726429c18c62dbf5e96ebbd522f262e016553fbVendor (CNA)
Linux Linux890bc4fac3c0973a49cac35f634579bebba7fe48Vendor (CNA)
Linux Linuxaf1689a9b7701d9907dfc84d2a4b57c4bc907144Vendor (CNA)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)
debian:linux-5.105.10.216-1~deb10u1 · Debian:10Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.7.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.5.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.7.3.150600.12.2.7 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.7.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.7.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.7.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.5.4 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.5.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:kernel-rt0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-core0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)
red hat:kernel-rt-debuginfo0:5.14.0-70.105.1.rt21.177.el9_0 · Red Hat:rhel_e4s:9.0::nfvPackage registry (OSV)

+14

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.

Variant candidates

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

  • CVE-2023-524401 days apartksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
    38Monitor
  • CVE-2021-4734891 days apartdrm/amd/display: Avoid HDCP over-read and corruption
    36Monitor
  • CVE-2022-3640487 days apartLinux Kernel Bluetooth l2cap_core.c l2cap_conn_del use after free
    35Monitor
  • CVE-2023-524411 days apartksmbd: fix out of bounds in init_smb2_rsp_hdr()
    31Monitor
  • CVE-2023-524442 days apartf2fs: fix to avoid dirent corruption
    31Monitor
  • CVE-2024-265882 days apartLoongArch: BPF: Prevent out-of-bounds memory access
    31Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • A low-privileged account is enough.
  • 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
Adjacent
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

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

nvd-primary

Attack context

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

ATT&CK techniques

—

References

Show all references (7 more)

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

All records