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NVD / CVE Program· CNA Linux

CVE-2024-40959: xfrm6: check ip6_dst_idev() return value in xfrm6_get_saddr()

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: 0.27% (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 20427b85781aca0ad072851f6907a3d4b2fed8d1, 600a62b4232ac027f788c3ca395bc2333adeaacf, 83c02fb2cc0afee5bb53cddf3f34f045f654ad6a.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 20427b85781aca0ad072851f6907a3d4b2fed8d1, 600a62b4232ac027f788c3ca395bc2333adeaacf, 83c02fb2cc0afee5bb53cddf3f34f045f654ad6a 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: xfrm6: check ip6_dst_idev() return value in xfrm6_get_saddr() ip6_dst_idev() can return NULL, xfrm6_get_saddr() must act accordingly. syzbot reported: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 12 Comm: kworker/u8:1 Not tainted 6.10.0-rc2-syzkaller-00383-gb8481381d4e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker RIP: 0010:xfrm6_get_saddr+0x93/0x130 net/ipv6/xfrm6_policy.c:64 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 97 00 00 00 4c 8b ab d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 86 00 00 00 4d 8b 6d 00 e8 ca 13 47 01 48 b8 00 RSP: 0018:ffffc90000117378 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88807b079dc0 RCX: ffffffff89a0d6d7 RDX: 0000000000000000 RSI: ffffffff89a0d6e9 RDI: ffff88807b079e98 RBP: ffff88807ad73248 R08: 0000000000000007 R09: fffffffffffff000 R10: ffff88807b079dc0 R11: 0000000000000007 R12: ffffc90000117480 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4586d00440 CR3: 0000000079042000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> xfrm_get_saddr net/xfrm/xfrm_policy.c:2452 [inline] xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2481 [inline] xfrm_tmpl_resolve+0xa26/0xf10 net/xfrm/xfrm_policy.c:2541 xfrm_resolve_and_create_bundle+0x140/0x2570 net/xfrm/xfrm_policy.c:2835 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:3070 [inline] xfrm_lookup_with_ifid+0x4d1/0x1e60 net/xfrm/xfrm_policy.c:3201 xfrm_lookup net/xfrm/xfrm_policy.c:3298 [inline] xfrm_lookup_route+0x3b/0x200 net/xfrm/xfrm_policy.c:3309 ip6_dst_lookup_flow+0x15c/0x1d0 net/ipv6/ip6_output.c:1256 send6+0x611/0xd20 drivers/net/wireguard/socket.c:139 wg_socket_send_skb_to_peer+0xf9/0x220 drivers/net/wireguard/socket.c:178 wg_socket_send_buffer_to_peer+0x12b/0x190 drivers/net/wireguard/socket.c:200 wg_packet_send_handshake_initiation+0x227/0x360 drivers/net/wireguard/send.c:40 wg_packet_handshake_send_worker+0x1c/0x30 drivers/net/wireguard/send.c:51 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 12, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 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.

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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 4.19.317
  • linux linux kernel4.20 and later · before 5.4.279
  • linux linux kernel5.5 and later · before 5.10.221
  • linux linux kernel5.11 and later · before 5.15.162
  • linux linux kernel5.16 and later · before 6.1.96
  • linux linux kernel6.2 and later · before 6.6.36
  • linux linux kernel6.7 and later · before 6.9.7
  • linux linux kernel6.10

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 c71761292d4d002a8eccb57b86792c4e3b3eb3c7affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before caf0bec84c62fb1cf6f7c9f0e8c857c87f8adbc3affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 20427b85781aca0ad072851f6907a3d4b2fed8d1affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9f30f1f1a51d91e19f5a09236bb0b59e6a07ad08affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 83c02fb2cc0afee5bb53cddf3f34f045f654ad6aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f897d7171652fcfc76d042bfec798b010ee89e41affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 600a62b4232ac027f788c3ca395bc2333adeaacfaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d46401052c2d5614da8efea5788532f0401cb164affected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9bpftoolbefore 7.3.0-427.40.1.el9_47.3.0-427.40.1.el9_4
AlmaLinux:9kernelbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64kbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-corebefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debugbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-develbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-corebefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-cross-headersbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-debugbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-debug-corebefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-debug-develbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.el9_4
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-427.40.1.el9_45.14.0-427.40.1.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-2024-40945Jul 12, 2024 · iommu: Return right value in iommu_sva_bind_device()
    22Monitor
  • ← EarlierCVE-2024-40958Jul 12, 2024 · netns: Make get_net_ns() handle zero refcount net
    31Monitor
  • Later →CVE-2024-40960Jul 12, 2024 · ipv6: prevent possible NULL dereference in rt6_probe()
    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 Linux20427b85781aca0ad072851f6907a3d4b2fed8d1Vendor (CNA)
Linux Linux600a62b4232ac027f788c3ca395bc2333adeaacfVendor (CNA)
Linux Linux83c02fb2cc0afee5bb53cddf3f34f045f654ad6aVendor (CNA)
Linux Linux9f30f1f1a51d91e19f5a09236bb0b59e6a07ad08Vendor (CNA)
Linux Linuxc71761292d4d002a8eccb57b86792c4e3b3eb3c7Vendor (CNA)
Linux Linuxcaf0bec84c62fb1cf6f7c9f0e8c857c87f8adbc3Vendor (CNA)
Linux Linuxd46401052c2d5614da8efea5788532f0401cb164Vendor (CNA)
Linux Linuxf897d7171652fcfc76d042bfec798b010ee89e41Vendor (CNA)
almalinux:bpftool7.3.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-427.40.1.el9_4 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.99-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-427.40.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+4

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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 Dereference

CVSS 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

  1. Fix✗ → ✓

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

References

Show all references (12 more)

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

All records