{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": { "cveId": "CVE-2024-26706", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.158Z", "datePublished": "2024-04-03T14:55:09.529Z", "dateUpdated": "2024-08-02T00:14:12.642Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:21:12.439Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Fix random data corruption from exception handler\n\nThe current exception handler implementation, which assists when accessing\nuser space memory, may exhibit random data corruption if the compiler decides\nto use a different register than the specified register %r29 (defined in\nASM_EXCEPTIONTABLE_REG) for the error code. If the compiler choose another\nregister, the fault handler will nevertheless store -EFAULT into %r29 and thus\ntrash whatever this register is used for.\nLooking at the assembly I found that this happens sometimes in emulate_ldd().\n\nTo solve the issue, the easiest solution would be if it somehow is\npossible to tell the fault handler which register is used to hold the error\ncode. Using %0 or %1 in the inline assembly is not posssible as it will show\nup as e.g. %r29 (with the \"%r\" prefix), which the GNU assembler can not\nconvert to an integer.\n\nThis patch takes another, better and more flexible approach:\nWe extend the __ex_table (which is out of the execution path) by one 32-word.\nIn this word we tell the compiler to insert the assembler instruction\n\"or %r0,%r0,%reg\", where %reg references the register which the compiler\nchoosed for the error return code.\nIn case of an access failure, the fault handler finds the __ex_table entry and\ncan examine the opcode. The used register is encoded in the lowest 5 bits, and\nthe fault handler can then store -EFAULT into this register.\n\nSince we extend the __ex_table to 3 words we can't use the BUILDTIME_TABLE_SORT\nconfig option any longer." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/parisc/Kconfig", "arch/parisc/include/asm/assembly.h", "arch/parisc/include/asm/extable.h", "arch/parisc/include/asm/special_insns.h", "arch/parisc/include/asm/uaccess.h", "arch/parisc/kernel/cache.c", "arch/parisc/kernel/unaligned.c", "arch/parisc/mm/fault.c" ], "versions": [ { "version": "1da177e4c3f4", "lessThan": "23027309b099", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "fa69a8063f8b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "ce31d79aa1f1", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f4", "lessThan": "8b1d72395635", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/parisc/Kconfig", "arch/parisc/include/asm/assembly.h", "arch/parisc/include/asm/extable.h", "arch/parisc/include/asm/special_insns.h", "arch/parisc/include/asm/uaccess.h", "arch/parisc/kernel/cache.c", "arch/parisc/kernel/unaligned.c", "arch/parisc/mm/fault.c" ], "versions": [ { "version": "6.1.79", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.18", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.7.6", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.8", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/23027309b099ffc4efca5477009a11dccbdae592" }, { "url": "https://git.kernel.org/stable/c/fa69a8063f8b27f3c7434a0d4f464a76a62f24d2" }, { "url": "https://git.kernel.org/stable/c/ce31d79aa1f13a2345791f84935281a2c194e003" }, { "url": "https://git.kernel.org/stable/c/8b1d72395635af45410b66cc4c4ab37a12c4a831" } ], "title": "parisc: Fix random data corruption from exception handler", "x_generator": { "engine": "bippy-a5840b7849dd" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-17T19:29:32.394995Z", "id": "CVE-2024-26706", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-17T19:29:43.758Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:12.642Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/23027309b099ffc4efca5477009a11dccbdae592", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/fa69a8063f8b27f3c7434a0d4f464a76a62f24d2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/ce31d79aa1f13a2345791f84935281a2c194e003", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8b1d72395635af45410b66cc4c4ab37a12c4a831", "tags": [ "x_transferred" ] } ] } ] } }