CVE-2024-26616 (GCVE-0-2024-26616)

Vulnerability from cvelistv5 – Published: 2024-02-29 15:52 – Updated: 2026-05-11 20:00
VLAI
Title
btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned [BUG] There is a bug report that, on a ext4-converted btrfs, scrub leads to various problems, including: - "unable to find chunk map" errors BTRFS info (device vdb): scrub: started on devid 1 BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096 BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056 This would lead to unrepariable errors. - Use-after-free KASAN reports: ================================================================== BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0 Read of size 8 at addr ffff8881013c9040 by task btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023 Call Trace: <TASK> dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part.0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f47e5e0952b - Crash, mostly due to above use-after-free [CAUSE] The converted fs has the following data chunk layout: item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80 length 86016 owner 2 stripe_len 65536 type DATA|single For above logical bytenr 2214744064, it's at the chunk end (2214658048 + 86016 = 2214744064). This means btrfs_submit_bio() would split the bio, and trigger endio function for both of the two halves. However scrub_submit_initial_read() would only expect the endio function to be called once, not any more. This means the first endio function would already free the bbio::bio, leaving the bvec freed, thus the 2nd endio call would lead to use-after-free. [FIX] - Make sure scrub_read_endio() only updates bits in its range Since we may read less than 64K at the end of the chunk, we should not touch the bits beyond chunk boundary. - Make sure scrub_submit_initial_read() only to read the chunk range This is done by calculating the real number of sectors we need to read, and add sector-by-sector to the bio. Thankfully the scrub read repair path won't need extra fixes: - scrub_stripe_submit_repair_read() With above fixes, we won't update error bit for range beyond chunk, thus scrub_stripe_submit_repair_read() should never submit any read beyond the chunk.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e02ee89baa66c40e1002cf8b09141fce7265e0f5 , < 642b9c520ef2f104277ad1f902f8526edbe087fb (git)
Affected: e02ee89baa66c40e1002cf8b09141fce7265e0f5 , < 34de0f04684ec00c093a0455648be055f0e8e24f (git)
Affected: e02ee89baa66c40e1002cf8b09141fce7265e0f5 , < f546c4282673497a06ecb6190b50ae7f6c85b02f (git)
Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.4\", \"versionEndExcluding\": \"6.6.15\", \"matchCriteriaId\": \"D6633E78-36B1-447E-BE57-C820A3E58E33\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.7\", \"versionEndExcluding\": \"6.7.3\", \"matchCriteriaId\": \"58FD5308-148A-40D3-B36A-0CA6B434A8BF\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"B9F4EA73-0894-400F-A490-3A397AB7A517\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\\n\\n[BUG]\\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\\nvarious problems, including:\\n\\n- \\\"unable to find chunk map\\\" errors\\n  BTRFS info (device vdb): scrub: started on devid 1\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\\n\\n  This would lead to unrepariable errors.\\n\\n- Use-after-free KASAN reports:\\n  ==================================================================\\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl+0x43/0x60\\n   print_report+0xcf/0x640\\n   kasan_report+0xa6/0xd0\\n   __blk_rq_map_sg+0x18f/0x7c0\\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   blk_mq_flush_plug_list.part.0+0x780/0x860\\n   __blk_flush_plug+0x1ba/0x220\\n   blk_finish_plug+0x3b/0x60\\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   __x64_sys_ioctl+0xbd/0x100\\n   do_syscall_64+0x5d/0xe0\\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  RIP: 0033:0x7f47e5e0952b\\n\\n- Crash, mostly due to above use-after-free\\n\\n[CAUSE]\\nThe converted fs has the following data chunk layout:\\n\\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\\n        length 86016 owner 2 stripe_len 65536 type DATA|single\\n\\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\\n(2214658048 + 86016 = 2214744064).\\n\\nThis means btrfs_submit_bio() would split the bio, and trigger endio\\nfunction for both of the two halves.\\n\\nHowever scrub_submit_initial_read() would only expect the endio function\\nto be called once, not any more.\\nThis means the first endio function would already free the bbio::bio,\\nleaving the bvec freed, thus the 2nd endio call would lead to\\nuse-after-free.\\n\\n[FIX]\\n- Make sure scrub_read_endio() only updates bits in its range\\n  Since we may read less than 64K at the end of the chunk, we should not\\n  touch the bits beyond chunk boundary.\\n\\n- Make sure scrub_submit_initial_read() only to read the chunk range\\n  This is done by calculating the real number of sectors we need to\\n  read, and add sector-by-sector to the bio.\\n\\nThankfully the scrub read repair path won\u0027t need extra fixes:\\n\\n- scrub_stripe_submit_repair_read()\\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\\n  thus scrub_stripe_submit_repair_read() should never submit any read\\n  beyond the chunk.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: limpieza: evita el use-after-free cuando la longitud del fragmento no est\\u00e1 alineada con 64 K [ERROR] Hay un informe de error que indica que, en un btrfs convertido a ext4, la limpieza conduce a varios problemas, que incluyen: - Errores \\\"no se puede encontrar el mapa de fragmentos\\\" Informaci\\u00f3n BTRFS (dispositivo vdb): limpieza: iniciado en el devid 1 BTRFS cr\\u00edtico (dispositivo vdb): no se puede encontrar el mapa de fragmentos para la longitud l\\u00f3gica 2214744064 4096 BTRFS cr\\u00edtico (dispositivo vdb): No se puede encontrar el mapa de fragmentos para la longitud l\\u00f3gica 2214744064 45056. Esto provocar\\u00eda errores irreparables. - Informes KASAN de uso gratuito: =========================================== ========================= ERROR: KASAN: slab-use-after-free en __blk_rq_map_sg+0x18f/0x7c0 Lectura de tama\\u00f1o 8 en la direcci\\u00f3n ffff8881013c9040 por tarea btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Nombre de hardware: PC est\\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 2023.11-2 24/12/2023 Seguimiento de llamadas :  dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02ed fad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part. 0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Flush_scrub_stripes+0x38 e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_chunk+0x178/0x200 [btrfs e579 87a360cama82fe8756dcd3e0de5406ccfe965 ] Scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btr fs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 Entry_SYSCALL_64_after_hwframe+0x63/0x6b QEPD: 0033:0x7f47e5e0952b - Fallo , principalmente debido al use-after-free anterior [CAUSA] El fs convertido tiene el siguiente dise\\u00f1o de fragmento de datos: clave del elemento 2 (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 tama\\u00f1o del elemento 80 longitud 86016 propietario 2 stripe_len 65536 tipo DATOS|single Para el bytenr l\\u00f3gico anterior 2214744064 , est\\u00e1 al final del fragmento (2214658048 + 86016 = 2214744064). Esto significa que btrfs_submit_bio() dividir\\u00eda la biograf\\u00eda y activar\\u00eda la funci\\u00f3n endio para ambas mitades. Sin embargo, Scrub_submit_initial_read() solo esperar\\u00eda que la funci\\u00f3n endio se llamara una vez, ya no. Esto significa que la primera funci\\u00f3n endio ya liberar\\u00eda bbio::bio, dejando libre el bvec, por lo que la segunda llamada a endio conducir\\u00eda a use-after-free. [FIX] - Aseg\\u00farese de que Scrub_read_endio() solo actualice los bits en su rango. Dado que podemos leer menos de 64 K al final del fragmento, no debemos tocar los bits m\\u00e1s all\\u00e1 del l\\u00edmite del fragmento. - Aseg\\u00farese de que Scrub_submit_initial_read() solo lea el rango de fragmentos. Esto se hace calculando el n\\u00famero real de sectores que necesitamos leer y agregando sector por sector a la biograf\\u00eda. Afortunadamente, la ruta de reparaci\\u00f3n de lectura de limpieza no necesitar\\u00e1 correcciones adicionales: - Scrub_stripe_submit_repair_read() Con las correcciones anteriores, no actualizaremos el bit de error para el rango m\\u00e1s all\\u00e1 del fragmento, por lo tanto, Scrub_stripe_submit_repair_read() nunca deber\\u00eda enviar ninguna lectura m\\u00e1s all\\u00e1 del fragmento.\"}]",
      "id": "CVE-2024-26616",
      "lastModified": "2024-12-12T15:31:18.293",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-03-11T18:15:19.400",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26616\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-11T18:15:19.400\",\"lastModified\":\"2026-06-17T07:17:54.237\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\\n\\n[BUG]\\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\\nvarious problems, including:\\n\\n- \\\"unable to find chunk map\\\" errors\\n  BTRFS info (device vdb): scrub: started on devid 1\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\\n\\n  This would lead to unrepariable errors.\\n\\n- Use-after-free KASAN reports:\\n  ==================================================================\\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl+0x43/0x60\\n   print_report+0xcf/0x640\\n   kasan_report+0xa6/0xd0\\n   __blk_rq_map_sg+0x18f/0x7c0\\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   blk_mq_flush_plug_list.part.0+0x780/0x860\\n   __blk_flush_plug+0x1ba/0x220\\n   blk_finish_plug+0x3b/0x60\\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   __x64_sys_ioctl+0xbd/0x100\\n   do_syscall_64+0x5d/0xe0\\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  RIP: 0033:0x7f47e5e0952b\\n\\n- Crash, mostly due to above use-after-free\\n\\n[CAUSE]\\nThe converted fs has the following data chunk layout:\\n\\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\\n        length 86016 owner 2 stripe_len 65536 type DATA|single\\n\\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\\n(2214658048 + 86016 = 2214744064).\\n\\nThis means btrfs_submit_bio() would split the bio, and trigger endio\\nfunction for both of the two halves.\\n\\nHowever scrub_submit_initial_read() would only expect the endio function\\nto be called once, not any more.\\nThis means the first endio function would already free the bbio::bio,\\nleaving the bvec freed, thus the 2nd endio call would lead to\\nuse-after-free.\\n\\n[FIX]\\n- Make sure scrub_read_endio() only updates bits in its range\\n  Since we may read less than 64K at the end of the chunk, we should not\\n  touch the bits beyond chunk boundary.\\n\\n- Make sure scrub_submit_initial_read() only to read the chunk range\\n  This is done by calculating the real number of sectors we need to\\n  read, and add sector-by-sector to the bio.\\n\\nThankfully the scrub read repair path won\u0027t need extra fixes:\\n\\n- scrub_stripe_submit_repair_read()\\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\\n  thus scrub_stripe_submit_repair_read() should never submit any read\\n  beyond the chunk.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: limpieza: evita el use-after-free cuando la longitud del fragmento no est\u00e1 alineada con 64 K [ERROR] Hay un informe de error que indica que, en un btrfs convertido a ext4, la limpieza conduce a varios problemas, que incluyen: - Errores \\\"no se puede encontrar el mapa de fragmentos\\\" Informaci\u00f3n BTRFS (dispositivo vdb): limpieza: iniciado en el devid 1 BTRFS cr\u00edtico (dispositivo vdb): no se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 4096 BTRFS cr\u00edtico (dispositivo vdb): No se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 45056. Esto provocar\u00eda errores irreparables. - Informes KASAN de uso gratuito: =========================================== ========================= ERROR: KASAN: slab-use-after-free en __blk_rq_map_sg+0x18f/0x7c0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881013c9040 por tarea btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Nombre de hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 2023.11-2 24/12/2023 Seguimiento de llamadas :  dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02ed fad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part. 0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Flush_scrub_stripes+0x38 e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_chunk+0x178/0x200 [btrfs e579 87a360cama82fe8756dcd3e0de5406ccfe965 ] Scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btr fs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 Entry_SYSCALL_64_after_hwframe+0x63/0x6b QEPD: 0033:0x7f47e5e0952b - Fallo , principalmente debido al use-after-free anterior [CAUSA] El fs convertido tiene el siguiente dise\u00f1o de fragmento de datos: clave del elemento 2 (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 tama\u00f1o del elemento 80 longitud 86016 propietario 2 stripe_len 65536 tipo DATOS|single Para el bytenr l\u00f3gico anterior 2214744064 , est\u00e1 al final del fragmento (2214658048 + 86016 = 2214744064). Esto significa que btrfs_submit_bio() dividir\u00eda la biograf\u00eda y activar\u00eda la funci\u00f3n endio para ambas mitades. Sin embargo, Scrub_submit_initial_read() solo esperar\u00eda que la funci\u00f3n endio se llamara una vez, ya no. Esto significa que la primera funci\u00f3n endio ya liberar\u00eda bbio::bio, dejando libre el bvec, por lo que la segunda llamada a endio conducir\u00eda a use-after-free. [FIX] - Aseg\u00farese de que Scrub_read_endio() solo actualice los bits en su rango. Dado que podemos leer menos de 64 K al final del fragmento, no debemos tocar los bits m\u00e1s all\u00e1 del l\u00edmite del fragmento. - Aseg\u00farese de que Scrub_submit_initial_read() solo lea el rango de fragmentos. Esto se hace calculando el n\u00famero real de sectores que necesitamos leer y agregando sector por sector a la biograf\u00eda. Afortunadamente, la ruta de reparaci\u00f3n de lectura de limpieza no necesitar\u00e1 correcciones adicionales: - Scrub_stripe_submit_repair_read() Con las correcciones anteriores, no actualizaremos el bit de error para el rango m\u00e1s all\u00e1 del fragmento, por lo tanto, Scrub_stripe_submit_repair_read() nunca deber\u00eda enviar ninguna lectura m\u00e1s all\u00e1 del fragmento.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/btrfs/scrub.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e02ee89baa66c40e1002cf8b09141fce7265e0f5\",\"lessThan\":\"642b9c520ef2f104277ad1f902f8526edbe087fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e02ee89baa66c40e1002cf8b09141fce7265e0f5\",\"lessThan\":\"34de0f04684ec00c093a0455648be055f0e8e24f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e02ee89baa66c40e1002cf8b09141fce7265e0f5\",\"lessThan\":\"f546c4282673497a06ecb6190b50ae7f6c85b02f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/btrfs/scrub.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.15\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.7.3\",\"lessThanOrEqual\":\"6.7.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T15:57:14.247460Z\",\"id\":\"CVE-2024-26616\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.4\",\"versionEndExcluding\":\"6.6.15\",\"matchCriteriaId\":\"D6633E78-36B1-447E-BE57-C820A3E58E33\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.3\",\"matchCriteriaId\":\"58FD5308-148A-40D3-B36A-0CA6B434A8BF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B9F4EA73-0894-400F-A490-3A397AB7A517\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T11:32:11+00:00",
      "cve": "CVE-2024-26616",
      "id": "CVE-2024-26616",
      "initial_release_date": "2024-02-29T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26616.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T16:57:03Z",
      "cve": "CVE-2024-26616",
      "id": "CVE-2024-26616",
      "initial_release_date": "2024-03-06T04:33:02Z",
      "product_status:known_not_affected": "292",
      "product_status:recommended": "206",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26616",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26616.json",
      "version": "34"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:07:19.788Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26616\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:57:14.247460Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:18.955Z\"}}], \"cna\": {\"title\": \"btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e02ee89baa66c40e1002cf8b09141fce7265e0f5\", \"lessThan\": \"642b9c520ef2f104277ad1f902f8526edbe087fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e02ee89baa66c40e1002cf8b09141fce7265e0f5\", \"lessThan\": \"34de0f04684ec00c093a0455648be055f0e8e24f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e02ee89baa66c40e1002cf8b09141fce7265e0f5\", \"lessThan\": \"f546c4282673497a06ecb6190b50ae7f6c85b02f\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/scrub.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.15\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/scrub.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\"}, {\"url\": \"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\"}, {\"url\": \"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\\n\\n[BUG]\\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\\nvarious problems, including:\\n\\n- \\\"unable to find chunk map\\\" errors\\n  BTRFS info (device vdb): scrub: started on devid 1\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\\n\\n  This would lead to unrepariable errors.\\n\\n- Use-after-free KASAN reports:\\n  ==================================================================\\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl+0x43/0x60\\n   print_report+0xcf/0x640\\n   kasan_report+0xa6/0xd0\\n   __blk_rq_map_sg+0x18f/0x7c0\\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   blk_mq_flush_plug_list.part.0+0x780/0x860\\n   __blk_flush_plug+0x1ba/0x220\\n   blk_finish_plug+0x3b/0x60\\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   __x64_sys_ioctl+0xbd/0x100\\n   do_syscall_64+0x5d/0xe0\\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  RIP: 0033:0x7f47e5e0952b\\n\\n- Crash, mostly due to above use-after-free\\n\\n[CAUSE]\\nThe converted fs has the following data chunk layout:\\n\\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\\n        length 86016 owner 2 stripe_len 65536 type DATA|single\\n\\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\\n(2214658048 + 86016 = 2214744064).\\n\\nThis means btrfs_submit_bio() would split the bio, and trigger endio\\nfunction for both of the two halves.\\n\\nHowever scrub_submit_initial_read() would only expect the endio function\\nto be called once, not any more.\\nThis means the first endio function would already free the bbio::bio,\\nleaving the bvec freed, thus the 2nd endio call would lead to\\nuse-after-free.\\n\\n[FIX]\\n- Make sure scrub_read_endio() only updates bits in its range\\n  Since we may read less than 64K at the end of the chunk, we should not\\n  touch the bits beyond chunk boundary.\\n\\n- Make sure scrub_submit_initial_read() only to read the chunk range\\n  This is done by calculating the real number of sectors we need to\\n  read, and add sector-by-sector to the bio.\\n\\nThankfully the scrub read repair path won\u0027t need extra fixes:\\n\\n- scrub_stripe_submit_repair_read()\\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\\n  thus scrub_stripe_submit_repair_read() should never submit any read\\n  beyond the chunk.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.15\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.3\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:00:50.930Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26616\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:00:50.930Z\", \"dateReserved\": \"2024-02-19T14:20:24.131Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T15:52:19.452Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.