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CVE-2026-93053— speakup: keyhelp: guard letter_offsets possible out-of-range indexing

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，已修复以下漏洞： speakup: keyhelp：防止 letter_offsets 发生越界索引 help_init() 通过以每个函数名的首字节作为索引来构建 letter_offsets[]，索引计算方式为 。如果 root 用户通过 sysfs 覆盖了函数名，且名称的首字符不在 [a–z] 范围内，该索引可能会发生下溢或超出数组范围，从而导致越界写入（OOB write）。 root 用户可通过以下命令覆盖函数名： modprobe speakup_soft echo "0 _ba

AI Predicted 7.8 Difficulty: Moderate

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c6e3fd22cd538365bfeb82997d5b89562e077d42< fd339b9ef0accb2c24a5285df842552ebf5eb146 affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< 900cd6e5ef46bd15153762fb26bb03f874fccc52 affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< 6b39969c724d39b6062efa354dc2d38442bfd021 affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< 2e91ab73f9beb659f581e2a6a09f79ace1140905 affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< d7deb90c4cd086cb111f0ecc9da021218fbde1b0 affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< 5310334762c3f08f51dc2414344dd47492c07d1d affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< ca4489b3e54666a7cac7294e71a3cf64e5e95286 affected
c6e3fd22cd538365bfeb82997d5b89562e077d42< 6a19ad4d68c95185308cd9e5d169b10a2cf236c8 affected
… +10 more rows
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I. Basic Information for CVE-2026-93053

Vulnerability Information
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Vulnerability Title
speakup: keyhelp: guard letter_offsets possible out-of-range indexing
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: speakup: keyhelp: guard letter_offsets possible out-of-range indexing help_init() builds letter_offsets[] by using the first byte of each function name as an index via `(start & 31) - 1`. If function_names are overridden from sysfs (root) with a name starting outside [a–z], the index underflows or exceeds the array, leading to OOB write. Function names can be overridden with the following commands as root: modprobe speakup_soft echo "0 _bad" > /sys/accessibility/speakup/i18n/function_names # then press Insert+2 on /dev/tty This fix checks the first letter in help_init(), and if it is not in the [a–z] range the function returns an error to the caller. Eventually this error is propagated to drivers/accessibility/speakup/main.c:2217, which causes a bleep sound.
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 c6e3fd22cd538365bfeb82997d5b89562e077d42 ~ fd339b9ef0accb2c24a5285df842552ebf5eb146 -
Linux Linux 2.6.37 -

II. Public POCs for CVE-2026-93053

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III. Intelligence Information for CVE-2026-93053

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Patches & Fixes for CVE-2026-93053 (8)

Same Patch Batch · Linux · 2026-09-17 · 602 CVEs total

CVE-2026-90255 Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90238 media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
CVE-2026-90240 iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90239 media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
CVE-2026-90241 iommu/vt-d: Tear down scalable-mode context on probe failure
CVE-2026-90243 iommu/vt-d: Clear Present bit before tearing down copied context entry
CVE-2026-90242 iommu/vt-d: Fix iopf_refcount leak on RID domain replacement
CVE-2026-90244 iommu/dma: Restore locking around msi_page_list
CVE-2026-90245 fbdev: kyro: Validate overlay viewport coordinates
CVE-2026-90246 apparmor: fix integer overflow in verify_tags() bounds check
CVE-2026-90247 bpf: Fix mmap_lock leak in irq_work path
CVE-2026-90248 net/sched: cls_api: fix teardown of an adopted proto on insert-race loss
CVE-2026-90249 iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes
CVE-2026-90250 bpf, cgroup: Fix storage null-ptr-deref after replacing prog
CVE-2026-90251 Bluetooth: MSFT: validate evt_prefix_len against the response length
CVE-2026-90253 Bluetooth: MGMT: free the mesh send cancel command when it is cancelled
CVE-2026-90252 Bluetooth: MGMT: free the HCI command when it is cancelled
CVE-2026-90254 Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
CVE-2026-90256 Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90268 scsi: sd: Fix error handling in sd_probe() after large pool creation failure

Showing top 20 of 602 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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