| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: don't allow reconnect after disconnect\n\nFollowing process can cause nbd_config UAF:\n\n1) grab nbd_config temporarily;\n\n2) nbd_genl_disconnect() flush all recv_work() and release the\ninitial reference:\n\n nbd_genl_disconnect\n nbd_disconnect_and_put\n nbd_disconnect\n flush_workqueue(nbd->recv_workq)\n if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF, ...))\n nbd_config_put\n -> due to step 1), reference is still not zero\n\n3) nbd_genl_reconfigure() queue recv_work() again;\n\n nbd_genl_reconfigure\n config = nbd_get_config_unlocked(nbd)\n if (!config)\n -> succeed\n if (!test_bit(NBD_RT_BOUND, ...))\n -> succeed\n nbd_reconnect_socket\n queue_work(nbd->recv_workq, &args->work)\n\n4) step 1) release the reference;\n\n5) Finially, recv_work() will trigger UAF:\n\n recv_work\n nbd_config_put(nbd)\n -> nbd_config is freed\n atomic_dec(&config->recv_threads)\n -> UAF\n\nFix the problem by clearing NBD_RT_BOUND in nbd_genl_disconnect(), so\nthat nbd_genl_reconfigure() will fail." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/block/nbd.c" |
| ], |
| "versions": [ |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "e70a578487a47d7cf058904141e586684d1c3381", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "6bef6222a3f6c7adb6396f77f25a3579d821b09a", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "e3be8862d73cac833e0fb7602636c19c6cb94b11", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "e7343fa33751cb07c1c56b666bf37cfca357130e", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "d208d2c52b652913b5eefc8ca434b0d6b757f68f", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "a8ee6ecde2b7bfb58c8a3afe8a9d2b848f580739", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "9793bd5ae4bdbdb2dde401a3cab94a6bfd05e302", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b7aa3d39385dc2d95899f9e379623fef446a2acd", |
| "lessThan": "844b8cdc681612ff24df62cdefddeab5772fadf1", |
| "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/block/nbd.c" |
| ], |
| "versions": [ |
| { |
| "version": "4.12", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "4.12", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.291", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.235", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.179", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.129", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.76", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12.13", |
| "lessThanOrEqual": "6.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.13.2", |
| "lessThanOrEqual": "6.13.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.14", |
| "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": "4.12", |
| "versionEndExcluding": "5.4.291" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.12", |
| "versionEndExcluding": "5.10.235" |
| }, |
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| "vulnerable": true, |
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| "versionStartIncluding": "4.12", |
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| }, |
| { |
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| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
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| "versionEndExcluding": "6.1.129" |
| }, |
| { |
| "vulnerable": true, |
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| "versionStartIncluding": "4.12", |
| "versionEndExcluding": "6.6.76" |
| }, |
| { |
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| "versionStartIncluding": "4.12", |
| "versionEndExcluding": "6.12.13" |
| }, |
| { |
| "vulnerable": true, |
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| "versionStartIncluding": "4.12", |
| "versionEndExcluding": "6.13.2" |
| }, |
| { |
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| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.12", |
| "versionEndExcluding": "6.14" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/e70a578487a47d7cf058904141e586684d1c3381" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/6bef6222a3f6c7adb6396f77f25a3579d821b09a" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/e3be8862d73cac833e0fb7602636c19c6cb94b11" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/e7343fa33751cb07c1c56b666bf37cfca357130e" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/d208d2c52b652913b5eefc8ca434b0d6b757f68f" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/a8ee6ecde2b7bfb58c8a3afe8a9d2b848f580739" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/9793bd5ae4bdbdb2dde401a3cab94a6bfd05e302" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/844b8cdc681612ff24df62cdefddeab5772fadf1" |
| } |
| ], |
| "title": "nbd: don't allow reconnect after disconnect", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2025-21731", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
