CVE-2026-98555— llc: fix skb UAF and leaks on llc_mac_hdr_init() failure
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Linux 内核中，以下漏洞已得到修复： llc：修复 llc_mac_hdr_init() 失败时引发的 skb 释放后使用（UAF）及内存泄漏问题 在 llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr() 函数中，若 llc_mac_hdr_init() 调用失败，代码错误地调用了 kfree_skb(skb)，而非 kfree_skb(nskb)。这导致新分配的 nskb 发生内存泄漏，同时通过 LLC_I_GET_NR(pdu) 读取了已被释放的 skb，并在 ll
Possible ATT&CK Techniques 1 AI
T1069 · Permission Groups DiscoveryAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fec0fe6838a7f45175667701fb51abb23a6ffb1e |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b859ba18b5a1067f71db5618c6a4a70d55fa308b |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8b855b645841b5a04e20339a22bb6d593c9b790d |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d360b31f1a3666579422872aa7d1a751e20b76f9 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 060f827aa3dc47939ee306da715cd6700d129616 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 41dcae82bece9f106b4dff0ee777bba8d157c8a8 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cb3528ad8bb46fa6252f5d14ced7febddc18515d |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 72f9dd522f8d6c5a00be9695c7bb74631eb5069e |
affected | ||
| … +10 more rows | |||
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-98555
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
llc: fix skb UAF and leaks on llc_mac_hdr_init() failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
llc: fix skb UAF and leaks on llc_mac_hdr_init() failure
In llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()
fails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks
the newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu),
and double-frees skb when llc_conn_state_process() drops its reference.
In llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is
leaked if llc_mac_hdr_init() returns an error.
Free nskb in all three error paths.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-98555
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-98555
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-98555 (6)
Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total
| CVE-2026-98720 | KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified | |
| CVE-2026-98733 | Bluetooth: hci_core: Serialize fragmented ISO packet queueing | |
| CVE-2026-98732 | Bluetooth: btintel: fix buffer over-read in btintel_hw_error() | |
| CVE-2026-98731 | Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame() | |
| CVE-2026-98730 | Bluetooth: btintel_pcie: reject oversized TX packets in send_frame() | |
| CVE-2026-98729 | x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h | |
| CVE-2026-98728 | tpm: fix off-by-four bounds check in tpm2_get_random() | |
| CVE-2026-98727 | nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known | |
| CVE-2026-98726 | nvme-multipath: fix underflow in ANA log bounds checks | |
| CVE-2026-98725 | nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge() | |
| CVE-2026-98724 | nvmet: pci-epf: reject too-short SGL segments | |
| CVE-2026-98723 | nvmet: copy the hostid into the ctrl before creating PR pc_refs | |
| CVE-2026-98722 | mtd: block2mtd: Fix divide error when erase_size is zero | |
| CVE-2026-98721 | mtd: rawnand: cadence: Initialize IRQ state before requesting IRQ | |
| CVE-2026-98709 | wifi: mac80211: count only matching reservations in reserved switch | |
| CVE-2026-98712 | KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq | |
| CVE-2026-98711 | wifi: cw1200: fix TX padding OOB read leaking heap data to device | |
| CVE-2026-98710 | wifi: iwlegacy: 3945: free EEPROM data on remove | |
| CVE-2026-98713 | KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT | |
| CVE-2026-98707 | wifi: mac80211: shut down RX BA session timer on teardown |
Showing top 20 of 435 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2026-98555
No comments yet