{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-26994", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-26994" ], "published": "2024-05-01T05:31:05Z", "summary": "speakup: Avoid crash on very long word", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nspeakup: Avoid crash on very long word\n\nIn case a console is set up really large and contains a really long word\n(> 256 characters), we have to stop before the length of the word buffer.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { 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"linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.88" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.29" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.29" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-26994" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/756c5cb7c09e537b87b5d3acafcb101b2ccf394f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8f6b62125befe1675446923e4171eac2c012959c" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/6401038acfa24cba9c28cce410b7505efadd0222" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0d130158db29f5e0b3893154908cf618896450a8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/89af25bd4b4bf6a71295f07e07a8ae7dc03c6595" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8defb1d22ba0395b81feb963b96e252b097ba76f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0efb15c14c493263cb3a5f65f5ddfd4603d19a76" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - The overflow is reached only through the speakup console screen-reader command path (`keyboard_notifier_call` \u2192 `speakup_key` \u2192 `do_spkup` \u2192 `get_word`) combined with `VT_RESIZE`/`PIO_UNIMAP`/`KDFONTOP` ioctls on the attacker's own virtual console, all of which require a local session on the machine. There is no network or remote protocol handler involved, but console/VT access is standard local access rather than physical device attachment.\nAC:L - Every precondition is under the attacker's control: `vt_ioctl()` grants `perm=1` to the tty owner, so an unprivileged console user can `VT_RESIZE` the console past 257 columns (up to `VC_MAXCOL`=32767 outright when the VC is bound to dummycon, which has no `con_resize` clamp, or via a narrow `KDFONTOP` font under fbcon), then print a >256-character word and press the say-word key. No race, no memory-layout luck, and on 4K framebuffer consoles the stock 8x16 font already yields 480 columns by default.\nPR:L - The attacker needs an ordinary unprivileged local account owning a virtual console \u2014 `current->signal->tty == tty` alone satisfies the VT ioctl permission check, so no CAP_SYS_TTY_CONFIG or root is required, and `do_spkup()` performs no capability check before invoking `get_word()`.\nUI:N - The attacker performs every step themselves \u2014 resizing their own VT, loading the unimap, painting the long word, and issuing the speakup say-word/spell-word command; no separate victim needs to be induced into any action.\nS:U - The out-of-bounds write corrupts kernel `.bss` belonging to the same kernel security authority that contains the vulnerable code; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The linear overflow lands on `spk_characters[256]`, a pointer array immediately following `buf` in `.bss`, whose entries are dereferenced and printed via `synth_printf(\"%s\", cp)` into the synth buffer that userspace reads from `/dev/softsynth` \u2014 giving an arbitrary kernel-memory read primitive disclosed to the attacker, well beyond a bounded leak.\nI:H - This is an out-of-bounds write of fully attacker-chosen 16-bit values (sourced from an attacker-loaded `inverse_trans_unicode` table) with attacker-chosen length, overwriting adjacent `.bss` pointer arrays such as `spk_our_keys[]` and `speakup_console[]`, the latter being dereferenced for writes (`speakup_console[vc_num]->ht.highbuf[bi][hi] = ic[i]`) \u2014 an arbitrary-write and control-flow-influence primitive.\nA:H - Even without careful exploitation, smashing kilobytes of `.bss` past `buf[256]` corrupts live pointer arrays that speakup dereferences on the next key event, producing an immediate kernel oops/panic \u2014 the crash the commit title explicitly refers to." } } }