{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-43877","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-08-17T09:11:59.281Z","datePublished":"2024-08-21T00:06:29.330Z","dateUpdated":"2026-08-05T11:36:53.441Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:36:53.441Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: pci: ivtv: Add check for DMA map result\n\nIn case DMA fails, 'dma->SG_length' is 0. This value is later used to\naccess 'dma->SGarray[dma->SG_length - 1]', which will cause out of\nbounds access.\n\nAdd check to return early on invalid value. Adjust warnings accordingly.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."}],"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 vulnerable code is reached only through local device nodes — `write()`/`ioctl(IVTVFB_IOC_DMA_FRAME)` on `/dev/fbN` and `write()`/`ioctl(IVTV_IOC_DMA_FRAME)` on the ivtv decoder video node. No remote or adjacent-network input reaches this path.\nAC:L - The attacker fully controls the userspace buffer address and the transfer size (up to 704 pages per call) and can retry the operation in an unbounded loop; because the card is 32-bit DMA-masked, every high page consumes shared swiotlb/32-bit IOVA resources that the attacker can pressure and exhaust, and once `dma_map_sg()` returns 0 the out-of-bounds write is deterministic.\nPR:L - There is no `capable()` or other privilege check anywhere along the path — access is governed solely by permissions on `/dev/video*` and `/dev/fb*`, which are held by ordinary console/desktop users in the `video` group and by non-root media daemons on set-top-box and embedded appliances.\nUI:N - The attacker triggers the bug entirely from their own process with a single `write()` or `ioctl()` call; no action by any other user is required.\nS:U - The corruption and its consequences stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed by the negative-index write itself.\nC:H - The corrupted `bouncemap[703]` page pointer is subsequently used as a bounce-buffer source, and the driver additionally programs the card with a stale SG array of already-unmapped DMA addresses, causing kernel memory the driver no longer owns to be copied into decoder RAM that userspace can read back — a memory-corruption primitive leveragable for arbitrary kernel disclosure.\nI:H - This is an out-of-bounds write that ORs bit 63 into an adjacent `struct page *`, and that poisoned pointer is later fed to `page_address()` + `memcpy()` with attacker-controlled data and to `__free_page()` — yielding a wild kernel write and page-allocator corruption suitable for control-flow hijacking.\nA:H - The failed transfer leaves no SG entry tagged with the completion-interrupt bit and arms no DMA timeout timer, so the caller loops forever in `schedule()` while holding `itv->udma.lock`, permanently wedging the driver; the wild `__free_page()`/`page_address()` dereferences additionally produce a kernel oops."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/pci/ivtv/ivtv-udma.c","drivers/media/pci/ivtv/ivtv-yuv.c","drivers/media/pci/ivtv/ivtvfb.c"],"versions":[{"version":"4551236b55e80b2c1720b10b77e9400118b2339e","lessThan":"38f72c7e7c6b55614f9407555fd5ce9d019b0fa4","status":"affected","versionType":"git"},{"version":"66c8a83bf1de2eb3eea4734c7eda22255a965f11","lessThan":"81d0664bed91a858c7b50c263954b59d65f1b414","status":"affected","versionType":"git"},{"version":"1932dc2f4cf6ac23e48e5fcc24d21adbe35691d1","lessThan":"24062aa7407091dee3e45a8e8037df437e848718","status":"affected","versionType":"git"},{"version":"1932dc2f4cf6ac23e48e5fcc24d21adbe35691d1","lessThan":"3d8fd92939e21ff0d45100ab208f8124af79402a","status":"affected","versionType":"git"},{"version":"1932dc2f4cf6ac23e48e5fcc24d21adbe35691d1","lessThan":"c766065e8272085ea9c436414b7ddf1f12e7787b","status":"affected","versionType":"git"},{"version":"1932dc2f4cf6ac23e48e5fcc24d21adbe35691d1","lessThan":"629913d6d79508b166c66e07e4857e20233d85a9","status":"affected","versionType":"git"},{"version":"1b00b7335000c0e107f774cc8ee4d5340f824f28","status":"affected","versionType":"git"},{"version":"5.4.301","lessThan":"5.5","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/pci/ivtv/ivtv-udma.c","drivers/media/pci/ivtv/ivtv-yuv.c","drivers/media/pci/ivtv/ivtvfb.c"],"versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"6.1.103","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.44","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.10.3","lessThanOrEqual":"6.10.*","status":"unaffected","versionType":"semver"},{"version":"6.11","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":"5.16","versionEndExcluding":"6.1.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.10.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.301"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/38f72c7e7c6b55614f9407555fd5ce9d019b0fa4"},{"url":"https://git.kernel.org/stable/c/81d0664bed91a858c7b50c263954b59d65f1b414"},{"url":"https://git.kernel.org/stable/c/24062aa7407091dee3e45a8e8037df437e848718"},{"url":"https://git.kernel.org/stable/c/3d8fd92939e21ff0d45100ab208f8124af79402a"},{"url":"https://git.kernel.org/stable/c/c766065e8272085ea9c436414b7ddf1f12e7787b"},{"url":"https://git.kernel.org/stable/c/629913d6d79508b166c66e07e4857e20233d85a9"}],"title":"media: pci: ivtv: Add check for DMA map result","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-43877","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:06:00.730463Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-12T17:33:17.774Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T22:06:27.712Z"}}]}}