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Message-ID: <2025091904-CVE-2025-39853-a617@gregkh> Date: Fri, 19 Sep 2025 17:28:17 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-39853: i40e: Fix potential invalid access when MAC list is empty From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: i40e: Fix potential invalid access when MAC list is empty list_first_entry() never returns NULL - if the list is empty, it still returns a pointer to an invalid object, leading to potential invalid memory access when dereferenced. Fix this by using list_first_entry_or_null instead of list_first_entry. The Linux kernel CVE team has assigned CVE-2025-39853 to this issue. Affected and fixed versions =========================== Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 5.4.299 with commit 971feafe157afac443027acdc235badc6838560b Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 5.10.243 with commit 3c6fb929afa313d9d11f780451d113f73922fe5d Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 5.15.192 with commit 1eadabcf5623f1237a539b16586b4ed8ac8dffcd Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 6.1.151 with commit e2a5e74879f9b494bbd66fa93f355feacde450c7 Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 6.6.105 with commit fb216d980fae6561c7c70af8ef826faf059c6515 Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 6.12.46 with commit 66e7cdbda74ee823ec2bf7b830ebd235c54f5ddf Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 6.16.6 with commit 9c21fc4cebd44dd21016c61261a683af390343f8 Issue introduced in 4.6 with commit e3219ce6a775468368fb270fae3eb82a6787b436 and fixed in 6.17-rc5 with commit a556f06338e1d5a85af0e32ecb46e365547f92b9 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-39853 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/net/ethernet/intel/i40e/i40e_client.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/971feafe157afac443027acdc235badc6838560b https://git.kernel.org/stable/c/3c6fb929afa313d9d11f780451d113f73922fe5d https://git.kernel.org/stable/c/1eadabcf5623f1237a539b16586b4ed8ac8dffcd https://git.kernel.org/stable/c/e2a5e74879f9b494bbd66fa93f355feacde450c7 https://git.kernel.org/stable/c/fb216d980fae6561c7c70af8ef826faf059c6515 https://git.kernel.org/stable/c/66e7cdbda74ee823ec2bf7b830ebd235c54f5ddf https://git.kernel.org/stable/c/9c21fc4cebd44dd21016c61261a683af390343f8 https://git.kernel.org/stable/c/a556f06338e1d5a85af0e32ecb46e365547f92b9
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