{"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"}}}}