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NVD / CVE Program· CNA Linux

CVE-2024-38538: net: bridge: xmit: make sure we have at least eth header len bytes

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.28% (FIRST EPSS).
  • Someone with local access to the system 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 1abb371147905ba250b4cc0230c4be7e90bea4d5, 28126b83f86ab9cc7936029c2dff845d3dcedba2, 3e01fc3c66e65d9afe98f1489047a1b2dd8741ca.

Low priority for now. Upgrade to Linux Linux 1abb371147905ba250b4cc0230c4be7e90bea4d5, 28126b83f86ab9cc7936029c2dff845d3dcedba2, 3e01fc3c66e65d9afe98f1489047a1b2dd8741ca 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: net: bridge: xmit: make sure we have at least eth header len bytes syzbot triggered an uninit value[1] error in bridge device's xmit path by sending a short (less than ETH_HLEN bytes) skb. To fix it check if we can actually pull that amount instead of assuming. Tested with dropwatch: drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3) origin: software timestamp: Mon May 13 11:31:53 2024 778214037 nsec protocol: 0x88a8 length: 2 original length: 2 drop reason: PKT_TOO_SMALL [1] BUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65 br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65 __netdev_start_xmit include/linux/netdevice.h:4903 [inline] netdev_start_xmit include/linux/netdevice.h:4917 [inline] xmit_one net/core/dev.c:3531 [inline] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547 __dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341 dev_queue_xmit include/linux/netdevice.h:3091 [inline] __bpf_tx_skb net/core/filter.c:2136 [inline] __bpf_redirect_common net/core/filter.c:2180 [inline] __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425 bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765 x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Jun 19, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.1
CNA · Linux
7.3
0.2 point gap

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-38538

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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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

Affected versions

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

  • linux linux kernel2.6.12 and later · before 6.1.93
  • linux linux kernel6.2 and later · before 6.6.33
  • linux linux kernel6.7 and later · before 6.8.12
  • linux linux kernel6.9 and later · before 6.9.3

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3e01fc3c66e65d9afe98f1489047a1b2dd8741caaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before b2b7c43cd32080221bb233741bd6011983fe7c11affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 82090f94c723dab724b1c32db406091d40448a17affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c964429ef53f42098a6545a5dabeb1441c1e821daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 28126b83f86ab9cc7936029c2dff845d3dcedba2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1abb371147905ba250b4cc0230c4be7e90bea4d5affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f482fd4ce919836a49012b2d31b00fc36e2488f2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 5b5d669f569807c7ab07546e73c0741845a2547aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afcaffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.33.1.el9_47.3.0-427.33.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.33.1.el9_45.14.0-427.33.1.el9_4

+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-2024-36978Jun 19, 2024 · net: sched: sch_multiq: fix possible OOB write in multiq_tune()
    31Monitor
  • ← EarlierCVE-2024-36979Jun 19, 2024 · net: bridge: mst: fix vlan use-after-free
    31Monitor
  • Later →CVE-2024-38539Jun 19, 2024 · RDMA/cma: Fix kmemleak in rdma_core observed during blktests nvme/rdma use siw
    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 Linux1abb371147905ba250b4cc0230c4be7e90bea4d5Vendor (CNA)
Linux Linux28126b83f86ab9cc7936029c2dff845d3dcedba2Vendor (CNA)
Linux Linux3e01fc3c66e65d9afe98f1489047a1b2dd8741caVendor (CNA)
Linux Linux5b5d669f569807c7ab07546e73c0741845a2547aVendor (CNA)
Linux Linux82090f94c723dab724b1c32db406091d40448a17Vendor (CNA)
Linux Linux8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afcVendor (CNA)
Linux Linuxb2b7c43cd32080221bb233741bd6011983fe7c11Vendor (CNA)
Linux Linuxc964429ef53f42098a6545a5dabeb1441c1e821dVendor (CNA)
Linux Linuxf482fd4ce919836a49012b2d31b00fc36e2488f2Vendor (CNA)
almalinux:bpftool7.3.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.33.1.el9_4 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.94-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.14.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.25.1.150600.12.10.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.25.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.25.1 · openSUSE:Leap 15.6Package registry (OSV)

+29

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.

  • CVE-2024-50302153 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2024-47685124 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2024-3689820 days apartgpiolib: cdev: fix uninitialised kfifo
    31Monitor
  • CVE-2021-4755326 days apartsched/scs: Reset task stack state in bringup_cpu()
    31Monitor
  • CVE-2024-2702249 days apartfork: defer linking file vma until vma is fully initialized
    31Monitor
  • CVE-2024-50143141 days apartudf: fix uninit-value use in udf_get_fileshortad
    31Monitor

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

  • Someone with local access to the system 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
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

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

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (9 more)

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

All records