{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40304","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.185Z","datePublished":"2025-12-08T00:46:29.013Z","dateUpdated":"2026-05-11T21:46:45.832Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:46:45.832Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds\n\nAdd bounds checking to prevent writes past framebuffer boundaries when\nrendering text near screen edges. Return early if the Y position is off-screen\nand clip image height to screen boundary. Break from the rendering loop if the\nX position is off-screen. When clipping image width to fit the screen, update\nthe character count to match the clipped width to prevent buffer size\nmismatches.\n\nWithout the character count update, bit_putcs_aligned and bit_putcs_unaligned\nreceive mismatched parameters where the buffer is allocated for the clipped\nwidth but cnt reflects the original larger count, causing out-of-bounds writes."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/bitblit.c"],"versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"996bfaa7372d6718b6d860bdf78f6618e850c702","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"f0982400648a3e00580253e0c48e991f34d2684c","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"ebc0730b490c7f27340b1222e01dd106e820320d","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"86df8ade88d290725554cefd03101ecd0fbd3752","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"15ba9acafb0517f8359ca30002c189a68ddbb939","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"2d1359e11674ed4274934eac8a71877ae5ae7bbb","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3637d34b35b287ab830e66048841ace404382b67","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/video/fbdev/core/bitblit.c"],"versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","status":"unaffected","versionType":"semver"},{"version":"5.4.302","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.247","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.197","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.159","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.117","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.58","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.17.8","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18","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":"2.6.12","versionEndExcluding":"5.4.302"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.197"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.17.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/996bfaa7372d6718b6d860bdf78f6618e850c702"},{"url":"https://git.kernel.org/stable/c/f0982400648a3e00580253e0c48e991f34d2684c"},{"url":"https://git.kernel.org/stable/c/1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1"},{"url":"https://git.kernel.org/stable/c/ebc0730b490c7f27340b1222e01dd106e820320d"},{"url":"https://git.kernel.org/stable/c/86df8ade88d290725554cefd03101ecd0fbd3752"},{"url":"https://git.kernel.org/stable/c/15ba9acafb0517f8359ca30002c189a68ddbb939"},{"url":"https://git.kernel.org/stable/c/2d1359e11674ed4274934eac8a71877ae5ae7bbb"},{"url":"https://git.kernel.org/stable/c/3637d34b35b287ab830e66048841ace404382b67"}],"title":"fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds","x_generator":{"engine":"bippy-1.2.0"}}}}