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CVE-2026-98020— pds_core: fix cmd_regs access racing BAR unmap on reset

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： pds_core: 修复在重置过程中，cmd_regs 访问与 BAR 解映射之间的竞态条件 pdsc_reset_prepare() 和 pdsc_reset_done() 中 pdsc_map_bars() 的错误处理路径，在未持有 devcmd_lock 锁的情况下清除了 iounmap cmd_regs；而 pdsc_legacy_firmware_update() 中的下载循环在释放并重新获取锁之后，未重新检查就直接解引用 cmd_regs。当 FLR（功能级

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux f6ec6ac9432941ec85a2221c91b1ecfc85680d89< 0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9 affected
e96094c1d11cce4deb5da3c0500d49041ab845b8< 2cc697565fd19b5ba2d100cdd4a20dd6d263abc2 affected
e96094c1d11cce4deb5da3c0500d49041ab845b8< fa31bd14c5042c6315bb2182c963f03ca6e79ca4 affected
e96094c1d11cce4deb5da3c0500d49041ab845b8< 09f831bfe39de5b8026fefb3d106b5cc93272170 affected
e96094c1d11cce4deb5da3c0500d49041ab845b8< 7980325b2f71e3f65c1323c39792e2455da6fab6 affected
692488941283d72362274620b9abd28109fc459f affected
6.6.16< 6.6.158 affected
6.7.4< 6.8 affected
… +7 more rows
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I. Basic Information for CVE-2026-98020

Vulnerability Information
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Vulnerability Title
pds_core: fix cmd_regs access racing BAR unmap on reset
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pds_core: fix cmd_regs access racing BAR unmap on reset pdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path clear/iounmap cmd_regs without devcmd_lock, and pdsc_legacy_firmware_update()'s download loop derefs cmd_regs after dropping and retaking the lock without re-checking. An FLR concurrent with a devlink flash can unmap cmd_regs under an in-flight devcmd, causing a NULL deref or a write to unmapped MMIO. Take devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in the download loop. Only the PF maps cmd_regs and runs devcmd, so skip the unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do. A reset that completes entirely within the unlocked window is not a correctness problem for the image: the device clears its update session, so a resumed download is rejected, and it verifies the staged image before writing a flash slot, reporting PDS_RC_BAD_FW rather than activating it. pdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The interrupt and start/stop readers of those are quiesced before the unmap by pdsc_fw_down(), which frees the interrupts and tears down the queues. The debugfs readers are not, since those files outlive a reset; that is pre-existing and out of scope here.
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 f6ec6ac9432941ec85a2221c91b1ecfc85680d89 ~ 0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-98020

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III. Intelligence Information for CVE-2026-98020

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Patches & Fixes for CVE-2026-98020 (4)

Other References for CVE-2026-98020 (1)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98020

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