{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74376","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.889Z","datePublished":"2026-08-15T05:58:55.023Z","dateUpdated":"2026-08-17T05:46:28.657Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:46:28.657Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: reset read_slot when reusing r10bio for discard\n\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\n\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - iSCSI/NVMe-oF targets and appliances commonly expose RAID10-backed LUNs; remote SCSI UNMAP maps through target_core iblock_execute_unmap()/blkdev_issue_discard() to md_handle_request() and raid10_handle_discard without local access.\nAC:L - The attacker controls both pool poisoning reads and triggering discards; mempool-reused r10bios retain a non-negative read_slot from prior reads, so each qualifying discard reliably skips repl_bio bio_put() when replacement mirrors exist.\nPR:N - Network UNMAP from an iSCSI/NVMe-oF client needs no Linux UID or capabilities on the target; local exploitation only needs O_RDWR on the md device or FITRIM (CAP_SYS_ADMIN, obtainable in user namespaces), both below High.\nUI:N - No interactive victim action—exploitation uses normal block-layer discard requests (fstrim cron, UNMAP, BLKDISCARD) issued or scripted by the attacker without cooperation.\nS:U - The bug corrupts/leaks kernel bio objects within the same host kernel security domain; it does not cross VM, container, or IOMMU boundaries.\nC:H - Stale read_slot misclassifies repl_bio as rdev in the r10dev union during put_all_bios(), leaking live bios holding kernel pointers and enabling heap-grooming read primitives; scored High when uncertain per memory-corruption guidance.\nI:H - The read_slot/repl_bio union type confusion skips bio_put() on attacker-submitted replacement discard clones, enabling slab manipulation for arbitrary kernel writes; type confusion maps to High integrity impact per kernel CVSS guidance.\nA:H - Repeated read-then-discard cycles leak bios on every hit; on busy RAID10 storage servers this exhausts kmem and can trigger OOM killer or panic, so Availability is High rather than Low per the conservative rule."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/raid10.c"],"versions":[{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"3cb2a606ce4902eceabe68338df0653312f861f8","status":"affected","versionType":"git"},{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"561c9711e4f545d6464a023168bdee03b00fa945","status":"affected","versionType":"git"},{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"ce3030e92f14362880055de5fe3c258971118853","status":"affected","versionType":"git"},{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"742e4afd247d9c972695227716b03d432a7e1d26","status":"affected","versionType":"git"},{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"b7313f23ea5a79b199a007bfad64a866cc2c22e7","status":"affected","versionType":"git"},{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"eb04e3e9c14ed15914f5fd2eae8b6435f54f095f","status":"affected","versionType":"git"},{"version":"d30588b2731fb01e1616cf16c3fe79a1443e29aa","lessThan":"6b8a26af065ddc93de2aa5c9f0df98dce9723442","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/md/raid10.c"],"versions":[{"version":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"5.13","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8"},{"url":"https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945"},{"url":"https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853"},{"url":"https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26"},{"url":"https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7"},{"url":"https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f"},{"url":"https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442"}],"title":"md/raid10: reset read_slot when reusing r10bio for discard","x_generator":{"engine":"bippy-1.2.0"}}}}