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CVE-2026-98728— tpm: fix off-by-four bounds check in tpm2_get_random()

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： tpm：修复 tpm2_get_random() 中差四的边界检查漏洞 当响应携带 TPM2_ST_SESSIONS 标签时，tpm2_get_random() 会跳过 4 字节的参数长度字段以定位随机数据，但其边界检查仍使用 TPM_HEADER_SIZE 来验证响应长度。若响应被截断，仍可能通过该检查，导致 memcpy() 读取超出响应末尾多达 4 字节的数据，从而使陈旧缓冲区内容混入调用方获取的随机字节中。 修复方法是：将响应长度与“偏移量（offset）”进行

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497< be54101992c2c5218be0e0a87827ccc96e3089af affected
1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497< e30a2406408d2df6d9cd48c2e59e913cf266a05a affected
1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497< 42bb6216b861e892512128219ff23010d656ba14 affected
1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497< 9b522400bf5c082feb9a0037a053ea822a2c7e4d affected
6.10 affected
< 6.10 unaffected
6.12.113≤ 6.12.* unaffected
6.18.56≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-98728

Vulnerability Information
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Vulnerability Title
tpm: fix off-by-four bounds check in tpm2_get_random()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tpm: fix off-by-four bounds check in tpm2_get_random() When the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random() skips the 4-byte parameter size field before locating the random data, but the bounds check still validates the response length against TPM_HEADER_SIZE. A truncated response can pass the check and make memcpy() read up to 4 bytes past the response end, so stale buffer contents end up in the caller's random bytes. Fix this by checking the response length against 'offset', which already includes the skipped parameter size field.
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 ~ be54101992c2c5218be0e0a87827ccc96e3089af -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-98728

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III. Intelligence Information for CVE-2026-98728

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Patches & Fixes for CVE-2026-98728 (4)

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98719 KVM: SEV: Nullify "have run CPUs" mask pointer when freeing it
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-2026-98727 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-2026-98720 KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified
CVE-2026-98707 wifi: mac80211: shut down RX BA session timer on teardown
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-2026-98709 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-2026-98708 wifi: mac80211: keep paired old chanctx alive

Showing top 20 of 435 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98728

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