{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2022-49266 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2022-49266 is a medium-severity denial of service vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2022-49266 and fix it if it is affected.\n\nWhat it is: CVE-2022-49266 is a medium-severity denial of service vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2022-49266 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2022-49266/ (Markdown: https://insights.sbomify.com/CVE-2022-49266/index.md)","id":"CVE-2022-49266","markdown":"https://insights.sbomify.com/CVE-2022-49266/index.md","name":"CVE-2022-49266","record":{"aliases":["DEBIAN-CVE-2022-49266","GHSA-3j4q-r565-vcj9","ROOT-OS-DEBIAN-11-CVE-2022-49266","UBUNTU-CVE-2022-49266"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel block layer","requires_auth":"low_privilege","summary":"A logic error in the Linux kernel block layer causes I/O control groups to become stuck, leading to a denial of service for isolated workloads.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: fix rq-qos breakage from skipping rq_qos_done_bio()\n\na647a524a467 (\"block: don't call rq_qos_ops-\u003edone_bio if the bio isn't\ntracked\") made bio_endio() skip rq_qos_done_bio() if BIO_TRACKED is not set.\nWhile this fixed a potential oops, it also broke blk-iocost by skipping the\ndone_bio callback for merged bios.\n\nBefore, whether a bio goes through rq_qos_throttle() or rq_qos_merge(),\nrq_qos_done_bio() would be called on the bio on completion with BIO_TRACKED\ndistinguishing the former from the latter. rq_qos_done_bio() is not called\nfor bios which wenth through rq_qos_merge(). This royally confuses\nblk-iocost as the merged bios never finish and are considered perpetually\nin-flight.\n\nOne reliably reproducible failure mode is an intermediate cgroup geting\nstuck active preventing its children from being activated due to the\nleaf-only rule, leading to loss of control. The following is from\nresctl-bench protection scenario which emulates isolating a web server like\nworkload from a memory bomb run on an iocost configuration which should\nyield a reasonable level of protection.\n\n  # cat /sys/block/nvme2n1/device/model\n  Samsung SSD 970 PRO 512GB\n  # cat /sys/fs/cgroup/io.cost.model\n  259:0 ctrl=user model=linear rbps=834913556 rseqiops=93622 rrandiops=102913 wbps=618985353 wseqiops=72325 wrandiops=71025\n  # cat /sys/fs/cgroup/io.cost.qos\n  259:0 enable=1 ctrl=user rpct=95.00 rlat=18776 wpct=95.00 wlat=8897 min=60.00 max=100.00\n  # resctl-bench -m 29.6G -r out.json run protection::scenario=mem-hog,loops=1\n  ...\n  Memory Hog Summary\n  ==================\n\n  IO Latency: R p50=242u:336u/2.5m p90=794u:1.4m/7.5m p99=2.7m:8.0m/62.5m max=8.0m:36.4m/350m\n              W p50=221u:323u/1.5m p90=709u:1.2m/5.5m p99=1.5m:2.5m/9.5m max=6.9m:35.9m/350m\n\n  Isolation and Request Latency Impact Distributions:\n\n                min   p01   p05   p10   p25   p50   p75   p90   p95   p99   max  mean stdev\n  isol%       15.90 15.90 15.90 40.05 57.24 59.07 60.01 74.63 74.63 90.35 90.35 58.12 15.82\n  lat-imp%        0     0     0     0     0  4.55 14.68 15.54 233.5 548.1 548.1 53.88 143.6\n\n  Result: isol=58.12:15.82% lat_imp=53.88%:143.6 work_csv=100.0% missing=3.96%\n\nThe isolation result of 58.12% is close to what this device would show\nwithout any IO control.\n\nFix it by introducing a new flag BIO_QOS_MERGED to mark merged bios and\ncalling rq_qos_done_bio() on them too. For consistency and clarity, rename\nBIO_TRACKED to BIO_QOS_THROTTLED. The flag checks are moved into\nrq_qos_done_bio() so that it's next to the code paths that set the flags.\n\nWith the patch applied, the above same benchmark shows:\n\n  # resctl-bench -m 29.6G -r out.json run protection::scenario=mem-hog,loops=1\n  ...\n  Memory Hog Summary\n  ==================\n\n  IO Latency: R p50=123u:84.4u/985u p90=322u:256u/2.5m p99=1.6m:1.4m/9.5m max=11.1m:36.0m/350m\n              W p50=429u:274u/995u p90=1.7m:1.3m/4.5m p99=3.4m:2.7m/11.5m max=7.9m:5.9m/26.5m\n\n  Isolation and Request Latency Impact Distributions:\n\n                min   p01   p05   p10   p25   p50   p75   p90   p95   p99   max  mean stdev\n  isol%       84.91 84.91 89.51 90.73 92.31 94.49 96.36 98.04 98.71 100.0 100.0 94.42  2.81\n  lat-imp%        0     0     0     0     0  2.81  5.73 11.11 13.92 17.53 22.61  4.10  4.68\n\n  Result: isol=94.42:2.81% lat_imp=4.10%:4.68 work_csv=58.34% missing=0%","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"block: fix rq-qos breakage from skipping rq_qos_done_bio()","id":"CVE-2022-49266","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2022"},"n_packages":0,"n_references":4,"next":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2022-49267"},"packages":[],"prev":{"headline":"PM: domains: Fix sleep-in-atomic bug caused by genpd_debug_remove()","id":"CVE-2022-49265"},"products":["Linux"],"published":"2025-02-26","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-23","vendors":["Linux"]},"summary":"A logic error in the Linux kernel block layer causes I/O control groups to become stuck, leading to a denial of service for isolated workloads.","url":"https://insights.sbomify.com/CVE-2022-49266/"}