{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-56557","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-12-27T14:03:05.992Z","datePublished":"2024-12-27T14:23:03.251Z","dateUpdated":"2026-08-05T11:45:05.174Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:45:05.174Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niio: adc: ad7923: Fix buffer overflow for tx_buf and ring_xfer\n\nThe AD7923 was updated to support devices with 8 channels, but the size\nof tx_buf and ring_xfer was not increased accordingly, leading to a\npotential buffer overflow in ad7923_update_scan_mode()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The overflow is reached only through local sysfs writes on the IIO device (`scan_elements/in_voltageN_en` then `buffer/enable`), which drive `iio_enable_buffers()` into `ad7923_update_scan_mode()`. No remote or adjacent network data reaches this code, and no physical access to the board is required.\nAC:L - The attacker fully controls the trigger — enabling five or more scan elements on an ad7908/ad7918/ad7928 and starting the buffer deterministically overflows `tx_buf` and `ring_xfer` on the first attempt, with no race to win and no state the attacker cannot set.\nPR:L - Nothing on the path checks any capability; only sysfs file permissions gate it, and on the embedded/industrial/Android systems where these SPI ADCs are deployed the IIO nodes are routinely handed to a non-root sensor or data-acquisition user or group by udev/ueventd rules. This matches the established scoring of the other IIO triggered-buffer CVEs reachable through the same interface.\nUI:N - The attacker performs the entire sequence — enabling scan elements, attaching a trigger, enabling the buffer — from their own process, and no other user needs to act.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel that contains the flaw, with no crossing of a hypervisor, IOMMU, or other security-authority boundary.\nC:H - The overflow overwrites `spi_message`/`spi_transfer` fields, so `spi_sync()` walks a corrupted transfer list and honors `tx_buf`/`rx_buf`/`len` values taken from smashed memory, and the resulting heap corruption is a general primitive that can be groomed into arbitrary kernel-memory disclosure.\nI:H - This is an out-of-bounds heap write of hundreds of bytes past `ring_xfer[4]`, including pointer values, that also clobbers `ring_msg.transfers.prev` mid-construction so `list_add_tail()` writes kernel pointers through an attacker-influenced address — a classic corruption-to-control-flow path.\nA:H - The clobbered `spi_message` list is immediately traversed by `spi_sync()` in `ad7923_trigger_handler()`, dereferencing wild `transfer_list` links, and the write past the end of the `iio_priv()` allocation corrupts adjacent slab state — a repeatable kernel oops or panic."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad7923.c"],"versions":[{"version":"851644a60d200c9a294de5a5594004bcf13d34c7","lessThan":"6e4d236d9c4b38571c394d3ab6e85dfb71c33ed3","status":"affected","versionType":"git"},{"version":"851644a60d200c9a294de5a5594004bcf13d34c7","lessThan":"00663d3e000c31d0d49ef86a809f5c107c2d09cd","status":"affected","versionType":"git"},{"version":"851644a60d200c9a294de5a5594004bcf13d34c7","lessThan":"e5cac32721997cb8bcb208a29f4598b3faf46338","status":"affected","versionType":"git"},{"version":"851644a60d200c9a294de5a5594004bcf13d34c7","lessThan":"218ecc35949129171ca39bcc0d407c8dc4cd0bbc","status":"affected","versionType":"git"},{"version":"851644a60d200c9a294de5a5594004bcf13d34c7","lessThan":"3a4187ec454e19903fd15f6e1825a4b84e59a4cd","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iio/adc/ad7923.c"],"versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.120","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.64","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.4","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/6e4d236d9c4b38571c394d3ab6e85dfb71c33ed3"},{"url":"https://git.kernel.org/stable/c/00663d3e000c31d0d49ef86a809f5c107c2d09cd"},{"url":"https://git.kernel.org/stable/c/e5cac32721997cb8bcb208a29f4598b3faf46338"},{"url":"https://git.kernel.org/stable/c/218ecc35949129171ca39bcc0d407c8dc4cd0bbc"},{"url":"https://git.kernel.org/stable/c/3a4187ec454e19903fd15f6e1825a4b84e59a4cd"}],"title":"iio: adc: ad7923: Fix buffer overflow for tx_buf and ring_xfer","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2024-56557","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-02-18T16:03:56.635182Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-120","description":"CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-02-18T16:06:09.556Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T20:49:26.305Z"}}]}}