Description
In the Linux kernel, the following vulnerability has been resolved: ixgbevf: fix use-after-free in VEPA multicast source pruning ixgbevf_clean_rx_irq() prunes frames whose source MAC matches the VF's own address (VEPA multicast workaround) by freeing the skb and continuing to the next descriptor: dev_kfree_skb_irq(skb); continue; The skb pointer is declared outside the while loop and persists across iterations. Because the continue skips the "skb = NULL" reset at the bottom of the loop, the next iteration enters the "else if (skb)" path and calls ixgbevf_add_rx_frag() on the freed skb, dereferencing skb_shinfo(skb)->nr_frags - a use-after-free in NAPI softirq context. The sibling driver iavf already handles this correctly by nulling the pointer before continuing. Apply the same pattern here. I do not have ixgbevf hardware; the bug was found by static analysis (scan_drop_continue_loops.py + semgrep drop_continue_in_loop, multi-tool corroboration with the highest score in the scan). The UAF was confirmed under KASAN by loading a test module that reproduces the exact code pattern (alloc skb, kfree_skb, then read skb_shinfo(skb)->nr_frags): BUG: KASAN: slab-use-after-free in ixgbevf_uaf_test_init+0x100/0x1000 Read of size 8 at addr 000000006163ae78 by task insmod/30 freed 208-byte region [000000006163adc0, 000000006163ae90) QEMU emulates igb (82576) but not ixgbe (82599), and the igbvf VF driver does not include the VEPA source pruning path, so a full end-to-end reproduction with emulated hardware was not possible.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
bad17234ba702a50aeec50ab04724ee58af89607 to < 3d931ac62411a7e43b85dba5fe45e1a4a91bd5cbaffectedbad17234ba702a50aeec50ab04724ee58af89607 to < 6ef30384a50a50e4a484cddf341bc27de31aa3deaffectedbad17234ba702a50aeec50ab04724ee58af89607 to < 55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1affectedbad17234ba702a50aeec50ab04724ee58af89607 to < add70e2682c0ad3be2a5810bcf1bc13963ba4df9affectedbad17234ba702a50aeec50ab04724ee58af89607 to < a244395d8c563ed1bb26c3ef708db6aeeaa08084affectedbad17234ba702a50aeec50ab04724ee58af89607 to < dfef79e09ed2f5df975c98547f97f5d7f8982a24affectedbad17234ba702a50aeec50ab04724ee58af89607 to < e8768bcbe5cd30c4ea36a22022c9ffaa66903693affectedbad17234ba702a50aeec50ab04724ee58af89607 to < 5d49b568c188dc77199d8d2b959c91da8cc27cf1affected
Linux Linux
Default version status: affected
3.19affected0 to < 3.19unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.142 to ≤ 6.6.*unaffected6.12.92 to ≤ 6.12.*unaffected6.18.34 to ≤ 6.18.*unaffected7.0.11 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb ↗
- https://git.kernel.org/stable/c/6ef30384a50a50e4a484cddf341bc27de31aa3de ↗
- https://git.kernel.org/stable/c/55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1 ↗
- https://git.kernel.org/stable/c/add70e2682c0ad3be2a5810bcf1bc13963ba4df9 ↗
- https://git.kernel.org/stable/c/a244395d8c563ed1bb26c3ef708db6aeeaa08084 ↗
- https://git.kernel.org/stable/c/dfef79e09ed2f5df975c98547f97f5d7f8982a24 ↗
- https://git.kernel.org/stable/c/e8768bcbe5cd30c4ea36a22022c9ffaa66903693 ↗
- https://git.kernel.org/stable/c/5d49b568c188dc77199d8d2b959c91da8cc27cf1 ↗