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CVE-2026-89440— mmc: via-sdmmc: stop card-detect handling on probe 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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于mmc via-sdmmc驱动在mmc_add_host()失败时未释放已注册的SD卡检测中断，导致via_sdc_isr()和carddet_work在主机内存释放后继续运行并访问已释放内存，可能造成释放后重用。

CVSS 7.8 · High EPSS 0.17% · P6

Affected Version Matrix 31

VendorProduct Version RangeStatus
Linux Linux 63400da6cd37a9793c19bb6aed7131b58b975a04< 5bb5327b92aae17e91c7228953c350a6ee3c94e8 affected
0959cc1685eb19774300d43ef25e318b457b156b< d045596706d1b25d38af4a79980b017639fea9d1 affected
ba91b413983a9235792523c6b9f7ba2586c4d75d< 806409f12fdb14c9e4c56a64494c9b75f356cd49 affected
e4e46fb61e3bb4628170810d3f2b996b709b90d9< dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02 affected
e4e46fb61e3bb4628170810d3f2b996b709b90d9< efe7f25dd27e35063477b4b0e7eed3675669fd99 affected
e4e46fb61e3bb4628170810d3f2b996b709b90d9< 2550f89589caad7402d618d7dffc038582c94b6b affected
e4e46fb61e3bb4628170810d3f2b996b709b90d9< c2b8a624911999399cc14822fec3e35032b3cee4 affected
e4e46fb61e3bb4628170810d3f2b996b709b90d9< 088eaa92fcebaa6b957ccf9635afdf39643a577d affected
… +23 more rows
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I. Basic Information for CVE-2026-89440

Vulnerability Information
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Vulnerability Title
mmc: via-sdmmc: stop card-detect handling on probe failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: stop card-detect handling on probe failure request_irq() registers the SD card-detect interrupt and the probe enables it before mmc_add_host() runs. If mmc_add_host() fails, the error path only unmaps the registers and returns: the interrupt stays registered, so the handler keeps running against the host once it is freed. via_sdc_isr() dereferences sdhost and its MMIO base and schedules carddet_work, which via_sdc_card_detect() also runs against freed memory through its container_of() dereference. Add a probe-error path that disables and frees the interrupt and cancels carddet_work before unmapping. carddet_work can re-enable the device interrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it again after cancelling the work. This issue was found by an in-house static analysis tool and confirmed by manual code review.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于mmc via-sdmmc驱动在mmc_add_host()失败时未释放已注册的SD卡检测中断，导致via_sdc_isr()和carddet_work在主机内存释放后继续运行并访问已释放内存，可能造成释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 63400da6cd37a9793c19bb6aed7131b58b975a04 ~ 5bb5327b92aae17e91c7228953c350a6ee3c94e8 -
Linux Linux 6.2 -

II. Public POCs for CVE-2026-89440

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III. Intelligence Information for CVE-2026-89440

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Patches & Fixes for CVE-2026-89440 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89440

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