{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54156", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:52.530Z", "datePublished": "2025-12-24T13:07:06.043Z", "dateUpdated": "2026-08-05T09:17:42.126Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:42.126Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix crash when reading stats while NIC is resetting\n\nefx_net_stats() (.ndo_get_stats64) can be called during an ethtool\n selftest, during which time nic_data->mc_stats is NULL as the NIC has\n been fini'd. In this case do not attempt to fetch the latest stats\n from the hardware, else we will crash on a NULL dereference:\n BUG: kernel NULL pointer dereference, address: 0000000000000038\n RIP efx_nic_update_stats\n abridged calltrace:\n efx_ef10_update_stats_pf\n efx_net_stats\n dev_get_stats\n dev_seq_printf_stats\nSkipping the read is safe, we will simply give out stale stats.\nTo ensure that the free in efx_ef10_fini_nic() does not race against\n efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the\n efx->stats_lock in fini_nic (it is already held across update_stats)." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only through local interfaces that read netdev statistics — /proc/net/dev, /sys/class/net/*/statistics/*, rtnetlink RTM_GETLINK, or ethtool -S — all requiring local access to the host. No remote peer can drive `.ndo_get_stats64`.\nAC:L - The attacker fully controls the read side and the vulnerable state persists for the entire duration of a reset or offline BIST selftest (seconds), so a simple polling loop hits it deterministically rather than winning a tight race; in a delegated-netns/SR-IOV deployment the attacker holds CAP_NET_ADMIN over the port and drives both sides (ethtool -t plus concurrent stats reads).\nPR:L - Reading /proc/net/dev or the sysfs statistics files requires no capability whatsoever, only an unprivileged local account; where the attacker also triggers the reset, CAP_NET_ADMIN over a namespace-delegated port is obtainable by an unprivileged user and counts as Low per kernel scoring guidance.\nUI:N - No victim action is needed — the attacker polls statistics continuously and the crash fires on the next reset, and in the strongest scenario the attacker initiates the reset themselves.\nS:U - The corruption and crash are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unsynchronized kfree lets `efx_nic_update_stats()` read a freed (and potentially reallocated) kmalloc-1k object and export its 16/32/64-bit contents to unprivileged userspace as network stat counters, disclosing freed kernel heap data; UAF read primitives are scored High.\nI:H - In the same race `efx_nic_copy_stats()` memcpy()s ~768 bytes of DMA'd MAC counters into the freed buffer, repeating for up to 10 ms in its retry loop, giving a use-after-free write into a sprayable slab with counter values an attacker can influence by shaping traffic to the NIC.\nA:H - The documented outcome is a kernel NULL pointer dereference oops at 0x38 in `efx_nic_update_stats()`, taken while holding `spin_lock_bh(&efx->stats_lock)` — the lock is then never released, so every later stats reader spins with BH disabled, producing a hang on top of the oops (or an immediate panic where panic_on_oops is set)." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/sfc/ef10.c" ], "versions": [ { "version": "d3142c193dca9a2f6878f4128ce1aaf221bb3f99", "lessThan": "cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb", "status": "affected", "versionType": "git" }, { "version": "d3142c193dca9a2f6878f4128ce1aaf221bb3f99", "lessThan": "91f4ef204e731565afdc6c2a7fcf509a3fd6fd67", "status": "affected", "versionType": "git" }, { "version": "d3142c193dca9a2f6878f4128ce1aaf221bb3f99", "lessThan": "446f5567934331923d0aec4ce045e4ecb0174aae", "status": "affected", "versionType": "git" }, { "version": "d3142c193dca9a2f6878f4128ce1aaf221bb3f99", "lessThan": "470152d76b3ed107d172ea46acc4bfa941f20b4b", "status": "affected", "versionType": "git" }, { "version": "d3142c193dca9a2f6878f4128ce1aaf221bb3f99", "lessThan": "aba32b4c58112960c0c708703ca6b44dc8944082", "status": "affected", "versionType": "git" }, { "version": "d3142c193dca9a2f6878f4128ce1aaf221bb3f99", "lessThan": "d1b355438b8325a486f087e506d412c4e852f37b", "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/net/ethernet/sfc/ef10.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.188", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.121", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.39", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.13", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.4", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "5.9", "versionEndExcluding": "5.10.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.121" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.3.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.4.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb" }, { "url": "https://git.kernel.org/stable/c/91f4ef204e731565afdc6c2a7fcf509a3fd6fd67" }, { "url": "https://git.kernel.org/stable/c/446f5567934331923d0aec4ce045e4ecb0174aae" }, { "url": "https://git.kernel.org/stable/c/470152d76b3ed107d172ea46acc4bfa941f20b4b" }, { "url": "https://git.kernel.org/stable/c/aba32b4c58112960c0c708703ca6b44dc8944082" }, { "url": "https://git.kernel.org/stable/c/d1b355438b8325a486f087e506d412c4e852f37b" } ], "title": "sfc: fix crash when reading stats while NIC is resetting", "x_generator": { "engine": "bippy-1.2.0" } } } }