{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26736", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.166Z", "datePublished": "2024-04-03T17:00:22.693Z", "dateUpdated": "2026-08-05T11:26:55.027Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:55.027Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Increase buffer size in afs_update_volume_status()\n\nThe max length of volume->vid value is 20 characters.\nSo increase idbuf[] size up to 24 to avoid overflow.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE.\n\n[DH: Actually, it's 20 + NUL, so increase it to 24 and use snprintf()]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The value formatted into the undersized stack buffer originates entirely from a remote Volume Location server's `VL.GetEntryByNameU` reply (`ntohl(uvldb->volumeId[i])`, fs/afs/vlclient.c:77), and the call into `afs_update_volume_status()` is itself forced on demand by a remote fileserver returning VNOVOL/VMOVED abort codes (fs/afs/rotate.c:247,387). AFS VL traffic is unauthenticated rxrpc over UDP, so a rogue cell server or an on-path response spoofer reaches this code across the network.\nAC:H - Overflowing `idbuf[16]` requires `volume->vid` to exceed 10 decimal digits, but the on-wire `volumeId[]` field is `__be32` (fs/afs/afs_vl.h:123) and is the sole source of `volume->vid`, capping it at `4294967295`. The wire-format width is a hard constraint entirely beyond the attacker's control, so no attainable input triggers the write.\nPR:N - The attacker is the VL server (or a network entity spoofing its unauthenticated replies) and holds no account, credential, or capability on the target host. No local privilege on the victim is consumed anywhere along the `afs_select_fileserver` → `afs_check_volume_status` → `afs_update_volume_status` path.\nUI:N - On a configured AFS client `/afs` is already mounted at boot, and the volume-status refresh fires from routine background revalidation and from server-supplied VMOVED/VNOVOL responses without any victim action. The attacker drives the update himself via the fileserver's abort codes.\nS:U - Any corruption is confined to the AFS client's own kernel stack frame within the same kernel security authority. No VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - A stack write past `idbuf` overwrites the adjacent locals in the same frame — the `new`/`old`/`discard`/`vldb` pointers and `idsz` — and corrupting `vldb` or `idsz` redirects the subsequent `memcmp`/`memcpy` of the volume name and the `afs_alloc_server_list()` walk, yielding an attacker-influenced kernel read. Per kernel guidance, memory corruption leverageable for disclosure is scored High.\nI:H - This is an out-of-bounds stack write, which per kernel guidance is High: the clobbered pointers are dereferenced and written through immediately afterwards (`memcpy(volume->name, vldb->name, AFS_MAXVOLNAME)`, `rcu_assign_pointer(volume->servers, new)`), giving a path to controlled kernel memory modification and control-flow influence.\nA:H - On any stack-protector kernel the 5-byte overrun smashes the canary and `__stack_chk_fail()` panics the machine; without it, the corrupted `vldb`/`new`/`old` pointers are dereferenced and freed (`kfree(vldb)`, `afs_put_serverlist()`), producing an oops. Either outcome is a full kernel crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/afs/volume.c" ], "versions": [ { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5", "status": "affected", "versionType": "git" }, { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "d9b5e2b7a8196850383c70d099bfd39e81ab6637", "status": "affected", "versionType": "git" }, { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "e56662160fc24d28cb75ac095cc6415ae1bda43e", "status": "affected", "versionType": "git" }, { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "e8530b170e464017203e3b8c6c49af6e916aece1", "status": "affected", "versionType": "git" }, { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "6e6065dd25b661420fac19c34282b6c626fcd35e", "status": "affected", "versionType": "git" }, { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "d34a5e57632bb5ff825196ddd9a48ca403626dfa", "status": "affected", "versionType": "git" }, { "version": "d2ddc776a4581d900fc3bdc7803b403daae64d88", "lessThan": "6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/afs/volume.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.270", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.211", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.150", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.80", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.19", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.7", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "4.15", "versionEndExcluding": "5.4.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.1.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.7.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5" }, { "url": "https://git.kernel.org/stable/c/d9b5e2b7a8196850383c70d099bfd39e81ab6637" }, { "url": "https://git.kernel.org/stable/c/e56662160fc24d28cb75ac095cc6415ae1bda43e" }, { "url": "https://git.kernel.org/stable/c/e8530b170e464017203e3b8c6c49af6e916aece1" }, { "url": "https://git.kernel.org/stable/c/6e6065dd25b661420fac19c34282b6c626fcd35e" }, { "url": "https://git.kernel.org/stable/c/d34a5e57632bb5ff825196ddd9a48ca403626dfa" }, { "url": "https://git.kernel.org/stable/c/6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d" } ], "title": "afs: Increase buffer size in afs_update_volume_status()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26736", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-04-05T17:35:04.677455Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:48:32.562Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:12.959Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d9b5e2b7a8196850383c70d099bfd39e81ab6637", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e56662160fc24d28cb75ac095cc6415ae1bda43e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e8530b170e464017203e3b8c6c49af6e916aece1", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6e6065dd25b661420fac19c34282b6c626fcd35e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d34a5e57632bb5ff825196ddd9a48ca403626dfa", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d", "tags": [ "x_transferred" ] }, { "url": 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