CVE-2024-46763: fou: Fix null-ptr-deref in GRO.
Noroxi assessment
Priority: Monitor (action score 22/100)
- 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: 0.71% (FIRST EPSS); higher than 53.6% of all records.
- 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 1df42be305fe478ded1ee0c1d775f4ece713483b, 231c235d2f7a66f018f172e26ffd47c363f244ef, 4494bccb52ffda22ce5a1163a776d970e6229e08.
- Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 1df42be305fe478ded1ee0c1d775f4ece713483b, 231c235d2f7a66f018f172e26ffd47c363f244ef, 4494bccb52ffda22ce5a1163a776d970e6229e08 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: fou: Fix null-ptr-deref in GRO. We observed a null-ptr-deref in fou_gro_receive() while shutting down a host. [0] The NULL pointer is sk->sk_user_data, and the offset 8 is of protocol in struct fou. When fou_release() is called due to netns dismantle or explicit tunnel teardown, udp_tunnel_sock_release() sets NULL to sk->sk_user_data. Then, the tunnel socket is destroyed after a single RCU grace period. So, in-flight udp4_gro_receive() could find the socket and execute the FOU GRO handler, where sk->sk_user_data could be NULL. Let's use rcu_dereference_sk_user_data() in fou_from_sock() and add NULL checks in FOU GRO handlers. [0]: BUG: kernel NULL pointer dereference, address: 0000000000000008 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 80000001032f4067 P4D 80000001032f4067 PUD 103240067 PMD 0 SMP PTI CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.216-204.855.amzn2.x86_64 #1 Hardware name: Amazon EC2 c5.large/, BIOS 1.0 10/16/2017 RIP: 0010:fou_gro_receive (net/ipv4/fou.c:233) [fou] Code: 41 5f c3 cc cc cc cc e8 e7 2e 69 f4 0f 1f 80 00 00 00 00 0f 1f 44 00 00 49 89 f8 41 54 48 89 f7 48 89 d6 49 8b 80 88 02 00 00 <0f> b6 48 08 0f b7 42 4a 66 25 fd fd 80 cc 02 66 89 42 4a 0f b6 42 RSP: 0018:ffffa330c0003d08 EFLAGS: 00010297 RAX: 0000000000000000 RBX: ffff93d9e3a6b900 RCX: 0000000000000010 RDX: ffff93d9e3a6b900 RSI: ffff93d9e3a6b900 RDI: ffff93dac2e24d08 RBP: ffff93d9e3a6b900 R08: ffff93dacbce6400 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffffb5f369b0 R12: ffff93dacbce6400 R13: ffff93dac2e24d08 R14: 0000000000000000 R15: ffffffffb4edd1c0 FS: 0000000000000000(0000) GS:ffff93daee800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000102140001 CR4: 00000000007706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <IRQ> ? show_trace_log_lvl (arch/x86/kernel/dumpstack.c:259) ? __die_body.cold (arch/x86/kernel/dumpstack.c:478 arch/x86/kernel/dumpstack.c:420) ? no_context (arch/x86/mm/fault.c:752) ? exc_page_fault (arch/x86/include/asm/irqflags.h:49 arch/x86/include/asm/irqflags.h:89 arch/x86/mm/fault.c:1435 arch/x86/mm/fault.c:1483) ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:571) ? fou_gro_receive (net/ipv4/fou.c:233) [fou] udp_gro_receive (include/linux/netdevice.h:2552 net/ipv4/udp_offload.c:559) udp4_gro_receive (net/ipv4/udp_offload.c:604) inet_gro_receive (net/ipv4/af_inet.c:1549 (discriminator 7)) dev_gro_receive (net/core/dev.c:6035 (discriminator 4)) napi_gro_receive (net/core/dev.c:6170) ena_clean_rx_irq (drivers/amazon/net/ena/ena_netdev.c:1558) [ena] ena_io_poll (drivers/amazon/net/ena/ena_netdev.c:1742) [ena] napi_poll (net/core/dev.c:6847) net_rx_action (net/core/dev.c:6917) __do_softirq (arch/x86/include/asm/jump_label.h:25 include/linux/jump_label.h:200 include/trace/events/irq.h:142 kernel/softirq.c:299) asm_call_irq_on_stack (arch/x86/entry/entry_64.S:809) </IRQ> do_softirq_own_stack (arch/x86/include/asm/irq_stack.h:27 arch/x86/include/asm/irq_stack.h:77 arch/x86/kernel/irq_64.c:77) irq_exit_rcu (kernel/softirq.c:393 kernel/softirq.c:423 kernel/softirq.c:435) common_interrupt (arch/x86/kernel/irq.c:239) asm_common_interrupt (arch/x86/include/asm/idtentry.h:626) RIP: 0010:acpi_idle_do_entry (arch/x86/include/asm/irqflags.h:49 arch/x86/include/asm/irqflags.h:89 drivers/acpi/processor_idle.c:114 drivers/acpi/processor_idle.c:575) Code: 8b 15 d1 3c c4 02 ed c3 cc cc cc cc 65 48 8b 04 25 40 ef 01 00 48 8b 00 a8 08 75 eb 0f 1f 44 00 00 0f 00 2d d5 09 55 00 fb f4 <fa> c3 cc cc cc cc e9 be fc ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 RSP: 0018:ffffffffb5603e58 EFLAGS: 00000246 RAX: 0000000000004000 RBX: ffff93dac0929c00 RCX: ffff93daee833900 RDX: ffff93daee800000 RSI: ffff93d ---truncated---
- Published
- Sep 18, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.7% · 53th percentile
- CWE
- CWE-476
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.7%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 7.5
- 2.0 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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
If any of these changes, we'll tell you in the daily email digest.
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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.
We use this product, ask for helpAffected 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.
| 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 kernel4.7 and later · before 5.10.226
- linux linux kernel5.11 and later · before 5.15.167
- linux linux kernel5.16 and later · before 6.1.110
- linux linux kernel6.2 and later · before 6.6.51
- linux linux kernel6.7 and later · before 6.10.10
- linux linux kernel6.11
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
- 4.7affected
- d92283e338f6d6503b7417536bf3478f466cbc01 and later · before 231c235d2f7a66f018f172e26ffd47c363f244efaffected · git
- d92283e338f6d6503b7417536bf3478f466cbc01 and later · before 4494bccb52ffda22ce5a1163a776d970e6229e08affected · git
- d92283e338f6d6503b7417536bf3478f466cbc01 and later · before d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3affected · git
- d92283e338f6d6503b7417536bf3478f466cbc01 and later · before 1df42be305fe478ded1ee0c1d775f4ece713483baffected · git
- d92283e338f6d6503b7417536bf3478f466cbc01 and later · before c46cd6aaca81040deaea3500ba75126963294bd9affected · git
- d92283e338f6d6503b7417536bf3478f466cbc01 and later · before 7e4196935069947d8b70b09c1660b67b067e75cbaffected · git
- before 4.7not affected · semver
- 5.10.226 and later · up to and including 5.10.*not affected · semver
- 5.15.167 and later · up to and including 5.15.*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:12 | linux | before 6.1.112-1 | 6.1.112-1 |
| Debian:13 | linux | before 6.10.11-1 | 6.10.11-1 |
| openSUSE:Leap 15.6 | dtb-aarch64 | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-64kb | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-azure | before 6.4.0-150600.8.37.1 | 6.4.0-150600.8.37.1 |
| openSUSE:Leap 15.6 | kernel-debug | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-default | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-default-base | before 6.4.0-150600.23.50.1.150600.12.22.1 | 6.4.0-150600.23.50.1.150600.12.22.1 |
| openSUSE:Leap 15.6 | kernel-docs | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-kvmsmall | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-obs-build | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-obs-qa | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-rt | before 6.4.0-150600.10.39.1 | 6.4.0-150600.10.39.1 |
| openSUSE:Leap 15.6 | kernel-rt_debug | before 6.4.0-150600.10.39.1 | 6.4.0-150600.10.39.1 |
| openSUSE:Leap 15.6 | kernel-source | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-source-azure | before 6.4.0-150600.8.37.1 | 6.4.0-150600.8.37.1 |
| openSUSE:Leap 15.6 | kernel-source-rt | before 6.4.0-150600.10.39.1 | 6.4.0-150600.10.39.1 |
| openSUSE:Leap 15.6 | kernel-syms | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-syms-azure | before 6.4.0-150600.8.37.1 | 6.4.0-150600.8.37.1 |
| openSUSE:Leap 15.6 | kernel-syms-rt | before 6.4.0-150600.10.39.1 | 6.4.0-150600.10.39.1 |
| openSUSE:Leap 15.6 | kernel-zfcpdump | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_11 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_11 | before 1-150600.1.3.2 | 1-150600.1.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_1 | before 1-150700.15.3.1 | 1-150700.15.3.1 |
+39
Same product
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- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2024-46761Sep 18, 2024 · pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv22Monitor
- ← EarlierCVE-2024-46762Sep 18, 2024 · xen: privcmd: Fix possible access to a freed kirqfd instance22Monitor
- Later →CVE-2024-46764Sep 18, 2024 · bpf: add check for invalid name in btf_name_valid_section()28Monitor
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 | 1df42be305fe478ded1ee0c1d775f4ece713483b | Vendor (CNA) |
| Linux Linux | 231c235d2f7a66f018f172e26ffd47c363f244ef | Vendor (CNA) |
| Linux Linux | 4494bccb52ffda22ce5a1163a776d970e6229e08 | Vendor (CNA) |
| Linux Linux | 7e4196935069947d8b70b09c1660b67b067e75cb | Vendor (CNA) |
| Linux Linux | c46cd6aaca81040deaea3500ba75126963294bd9 | Vendor (CNA) |
| Linux Linux | d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3 | Vendor (CNA) |
| debian:linux | 6.1.112-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-debug | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-default | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-default-base | 6.4.0-150600.23.50.1.150600.12.22.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-docs | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-obs-build | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-source | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-syms | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-zfcpdump | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-azure | 6.4.0-150600.8.37.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.50.1.150600.12.22.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-docs | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_11 | 1-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-source | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-source-azure | 6.4.0-150600.8.37.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | Package registry (OSV) |
| suse:kernel-syms | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-syms-azure | 6.4.0-150600.8.37.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | Package registry (OSV) |
+1
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 researchersFinders, 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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-1498 · Sep 19, 2024(Linux Kernel Güvenlik Bildirimi)
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
- none
- 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
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/231c235d2f7a66f018f172e26ffd47c363f244ef
- git.kernel.org/stable/c/4494bccb52ffda22ce5a1163a776d970e6229e08
- git.kernel.org/stable/c/7e4196935069947d8b70b09c1660b67b067e75cb
- git.kernel.org/stable/c/c46cd6aaca81040deaea3500ba75126963294bd9
- git.kernel.org/stable/c/d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3
- lists.debian.org/debian-lts-announce/2024/10/msg00003.html
- lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.