{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-93039", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2026-93039" ], "published": "2026-09-17T16:10:40Z", "summary": "ASoC: meson: Keep link pointers valid on realloc failure", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: meson: Keep link pointers valid on realloc failure\n\nmeson_card_reallocate_links() grows the DAI link and private data\narrays with two consecutive krealloc() calls and updates the owner\npointers only after both calls have succeeded.\n\nA successful krealloc() may move the data: it frees the old block and\nreturns a new one. When that happens for the link array and the second\nkrealloc() then fails, card->dai_link still points to the block that\nkrealloc() already freed, and the error path frees the new block too.\nThe probe error path then calls meson_card_clean_references(), which\ndereferences card->dai_link and kfree()s it again, resulting in a\nuse-after-free and a double free.\n\nCommit card->dai_link and card->num_links right after the first\nkrealloc() succeeds, so the pointer always refers to a valid allocation\nthat meson_card_clean_references() can walk and free. krealloc() with\n__GFP_ZERO zero-initializes the added entries, so walking them on the\nerror path is safe. With both failure paths reduced to a plain return,\ndrop the goto labels and the error message.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.47-1+rpt4" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi3-rpi-2712", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v6", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l", "binary_version": "1:6.1.47-1+rpt4" }, { "binary_name": "linux-image-6.1.0-rpi3-rpi-v8", "binary_version": "1:6.1.47-1+rpt4" } ] }, "database_specific": { "per_version": { "1:6.1.47-1+rpt4": { "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e", "upstream_version": "6.1.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.188", "compiled_filter": false } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2026-93039" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/de33afc57f24538186bccf4c4f6c65dd38634fd8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1c1485343b7c1c39dab7ecb9cd16ba49fd0ce642" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8db0a0fc84e80aa9924e0833aef6cc95df94e5a7" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/41e92e0caa1fe3df2efaca346bfcaeb7fb9826ab" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0b30fbe6bf7cf6499b19dd886f466e7c9e820089" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8fec16898f184e5f8f8fdd09ff1ced2bd7ffc13d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/5ed1b048527bebe4529eb6e01c34dcc5d97ba5fe" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2aaa41cf974f83a6fb105422bac4e2f107150774" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-09-18T17:55:42Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.4, "cvss_v3_severity": "High", "scenario": "AV:L - meson_card_reallocate_links() is reached only from meson_card_probe() (axg_card_pdrv.probe for compatible \"amlogic,axg-sound-card\") via meson_card_add_links() and axg_card_add_tdm_loopback(); no network protocol message or USB descriptor carries the dangling dai_link pointer.\nAC:H - The UAF fires only if meson_card_reallocate_links()'s krealloc of card->dai_link succeeds and the following krealloc of priv->link_data returns NULL. Both are GFP_KERNEL (reclaim allowed). meson_card_probe() then returns -ENOMEM; snd_soc_bind_card() maps DAI-component -EPROBE_DEFER to 0, so driver core does not retry axg_card_add_tdm_loopback().\nPR:N - meson_card_probe() and axg_card_add_tdm_loopback() have no capable() check. On Amlogic boards whose DT includes amlogic,axg-sound-card with a TDM playback link (meson-axg-s400.dts dai-link-6 / meson-khadas-vim3.dtsi dai-link-6), of_platform or udev autoload of snd-soc-meson-axg-sound-card runs this probe without an OS account.\nUI:N - axg_card_add_tdm_loopback() runs inside meson_card_probe() during automatic platform bind of the DT sound node; no victim must open /dev/snd/*, mount media, or plug extra hardware.\nS:U - meson_card_clean_references() use-after-frees and double-frees the host-kernel card->dai_link array from meson_card_reallocate_links(); impact stays in this kernel and is not a VM escape or IOMMU/DMA bypass.\nC:H - On the second-krealloc failure, meson_card_clean_references() walks the stale card->dai_link with for_each_card_prelinks() and reads link->cpus and link->codecs from the already-freed snd_soc_dai_link array, a heap UAF read.\nI:H - The same path kfree()s card->dai_link again (the old block krealloc may already have freed, or err_ldata's kfree(links) already released) and of_node_put()s pointers loaded from that freed array, a double-free/UAF write primitive.\nA:H - meson_card_clean_references() dereferences and kfree()s the freed dai_link array after meson_card_reallocate_links() returns -ENOMEM, causing a kernel oops or panic (slab UAF / invalid-free)." } } }