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CVE-2026-43121

In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix user_ref race between scrub and refill paths The io_zcrx_put_niov_uref() function uses a non-atomic check-then-decrement pattern (atomic_read followed by separate atomic_dec) to manipulate user_refs. This is serialized against other callers by rq_lock, but io_zcrx_scrub() modifies the same counter with atomic_xchg() WITHOUT holding rq_lock. On SMP systems, the following race exists: CPU0 (refill, holds r
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6ea83369df729b50b619a9188dcc7e0ebedca9faa21202f1978585a3b24ce2b6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["io_uring/zcrx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.15"},{"lessThan":"6.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.16","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["io_uring/zcrx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a94f096e28bfc7975163a6b80f1c8f323efe317a","status":"affected","version":"34a3e60821ab9f335a58d43a88cccdbefdebdec3","versionType":"git"},{"lessThan":"485dc691257b96e6d3bdc25b0eff2daadcc5c46c","status":"affected","version":"34a3e60821ab9f335a58d43a88cccdbefdebdec3","versionType":"git"},{"lessThan":"003049b1c4fb8aabb93febb7d1e49004f6ad653b","status":"affected","version":"34a3e60821ab9f335a58d43a88cccd…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["io_uring/zcrx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.15"},{"lessThan":"6.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.16","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["io_uring/zcrx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a94f096e28bfc7975163a6b80f1c8f323efe317a","status":"affected","version":"34a3e60821ab9f335a58d43a88cccdbefdebdec3","versionType":"git"},{"lessThan":"485dc691257b96e6d3bdc25b0eff2daadcc5c46c","status":"affected","version":"34a3e60821ab9f335a58d43a88cccdbefdebdec3","versionType":"git"},{"lessThan":"003049b1c4fb8aabb93febb7d1e49004f6ad653b","status":"affected","version":"34a3e60821ab9f335a58d43a88cccd…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/affected/0

Source references

3 source assertions
{"url":"https://git.kernel.org/stable/c/003049b1c4fb8aabb93febb7d1e49004f6ad653b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/485dc691257b96e6d3bdc25b0eff2daadcc5c46c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/a94f096e28bfc7975163a6b80f1c8f323efe317a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c9329047285a38bd07d4a4f06f0a1d63ce44a5b95782e89ccfe74b299df1254a · sha256:074bb122102805ce… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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