{"id":"CVE-2025-68797","state":"PUBLISHED","title":"char: applicom: fix NULL pointer dereference in ac_ioctl","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nchar: applicom: fix NULL pointer dereference in ac_ioctl\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nIn ac_ioctl, the validation of IndexCard and the check for a valid\nRamIO pointer are skipped when cmd is 6. However, the function\nunconditionally executes readb(apbs[IndexCard].RamIO + VERS) at the\nend.\n\nIf cmd is 6, IndexCard may reference a board that does not exist\n(where RamIO is NULL), leading to a NULL pointer dereference.\n\nFix this by skipping the readb access when cmd is 6, as this\ncommand is a global information query and does not target a specific\nboard context.","publishedAt":"2026-01-13T15:29:07.575Z","updatedAt":"2026-05-11T21:53:31.417Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5a6240804fb7bbd4f5f6e706955248a6f4c1abbc","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d1b0452280029d05a98c75631131ee61c0b0d084","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"0b8b353e09888bccee405e0dd6feafb60360f478","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d285517429a75423789e6408653e57b6fdfc8e54","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"74883565c621eec6cd2e35fe6d27454cf2810c23","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f83e3e9f89181b42f6076a115d767a7552c4a39e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"82d12088c297fa1cef670e1718b3d24f414c23f7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/applicom.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/applicom.c"]}],"references":["https://git.kernel.org/stable/c/5a6240804fb7bbd4f5f6e706955248a6f4c1abbc","https://git.kernel.org/stable/c/d1b0452280029d05a98c75631131ee61c0b0d084","https://git.kernel.org/stable/c/0b8b353e09888bccee405e0dd6feafb60360f478","https://git.kernel.org/stable/c/d285517429a75423789e6408653e57b6fdfc8e54","https://git.kernel.org/stable/c/74883565c621eec6cd2e35fe6d27454cf2810c23","https://git.kernel.org/stable/c/f83e3e9f89181b42f6076a115d767a7552c4a39e","https://git.kernel.org/stable/c/82d12088c297fa1cef670e1718b3d24f414c23f7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68797.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68797","state":"PUBLISHED","datePublished":"2026-01-13T15:29:07.575Z","dateUpdated":"2026-05-11T21:53:31.417Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:30:51.042Z"},"containers":{"cna":{"title":"char: applicom: fix NULL pointer dereference in ac_ioctl","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nchar: applicom: fix NULL pointer dereference in ac_ioctl\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nIn ac_ioctl, the validation of IndexCard and the check for a valid\nRamIO pointer are skipped when cmd is 6. However, the function\nunconditionally executes readb(apbs[IndexCard].RamIO + VERS) at the\nend.\n\nIf cmd is 6, IndexCard may reference a board that does not exist\n(where RamIO is NULL), leading to a NULL pointer dereference.\n\nFix this by skipping the readb access when cmd is 6, as this\ncommand is a global information query and does not target a specific\nboard context."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5a6240804fb7bbd4f5f6e706955248a6f4c1abbc","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d1b0452280029d05a98c75631131ee61c0b0d084","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"0b8b353e09888bccee405e0dd6feafb60360f478","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"d285517429a75423789e6408653e57b6fdfc8e54","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"74883565c621eec6cd2e35fe6d27454cf2810c23","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f83e3e9f89181b42f6076a115d767a7552c4a39e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"82d12088c297fa1cef670e1718b3d24f414c23f7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/applicom.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/applicom.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5a6240804fb7bbd4f5f6e706955248a6f4c1abbc"},{"url":"https://git.kernel.org/stable/c/d1b0452280029d05a98c75631131ee61c0b0d084"},{"url":"https://git.kernel.org/stable/c/0b8b353e09888bccee405e0dd6feafb60360f478"},{"url":"https://git.kernel.org/stable/c/d285517429a75423789e6408653e57b6fdfc8e54"},{"url":"https://git.kernel.org/stable/c/74883565c621eec6cd2e35fe6d27454cf2810c23"},{"url":"https://git.kernel.org/stable/c/f83e3e9f89181b42f6076a115d767a7552c4a39e"},{"url":"https://git.kernel.org/stable/c/82d12088c297fa1cef670e1718b3d24f414c23f7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:53:31.417Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.248"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}